Devxcode — Developer tools that run in your browser

Data Formats & Conversion

JSON FormatterPretty-print JSON with configurable indentation — big numbers preserved exactly, entirely on this device.Data Formats & Conversion
JSON ValidatorSyntax-check JSON with the exact line, column and probable cause of every error — entirely on this device.Data Formats & Conversion
JSON MinifierStrip insignificant whitespace from JSON — values and key order byte-identical, gzip savings measured, entirely on this device.Data Formats & Conversion
JSON Tree ViewerNavigate huge JSON as a collapsible, searchable tree — copy any value or path, entirely on this device.Data Formats & Conversion
JSON EditorEdit JSON in a tree, table or text view — every change re-renders the other two and big numbers stay exact, entirely on this device.Data Formats & Conversion
JSON Diff / CompareCompare two JSON documents structurally — key order ignored, big numbers exact, RFC 6902 patch export — entirely on this device.Data Formats & Conversion
JSON Repair / FixerTurn almost-JSON into valid JSON with a logged, visible fix for every change — entirely on this device.Data Formats & Conversion
JSON SorterSort JSON object keys recursively — ascending or descending, on this device.Data Formats & Conversion
JSON Escape / UnescapeBackslash-escape text into a JSON string body — or unescape one back to text — entirely on this device.Data Formats & Conversion
JSON Stringify / UnstringifyWrap a JSON document as a quoted, escaped JSON string token — and unstringify it back — entirely on this device.Data Formats & Conversion
JSON to One LineCollapse JSON to a single line for logs, env vars and inline config — readable spacing or fully compact, big numbers preserved exactly, entirely on this device.Data Formats & Conversion
JSON Flatten / UnflattenFlatten nested JSON to dot- or bracket-path keys and unflatten it back — big numbers exact, entirely on this device.Data Formats & Conversion
JSON Graph VisualizerSee any JSON document as an interactive, collapsible node graph — pan, zoom and copy any path, entirely on this device.Data Formats & Conversion
NDJSON / JSON Lines ConverterReshape JSON between a single array and one-record-per-line NDJSON — losslessly, with every line validated, entirely on this device.Data Formats & Conversion
JSONPath TesterEvaluate a JSONPath expression against your JSON and see every match highlighted in the source — RFC 9535 semantics, entirely on this device.Data Formats & Conversion
JSON Path FinderClick any node in a JSON tree to copy its JSONPath, jq, JS, or RFC 6901 JSON Pointer path — entirely on this device.Data Formats & Conversion
jq PlaygroundRun jq filters over your JSON in-browser — jq 1.8.2 on WebAssembly, stdout and errors verbatim, entirely on this device.Data Formats & Conversion
JSON Schema ValidatorCheck a JSON document against a JSON Schema and see every violation with its data path and schema path — entirely on this device.Data Formats & Conversion
JSON Schema GeneratorPaste sample JSON, get a JSON Schema in the draft you target — required derived from what the samples actually show, entirely on this device.Data Formats & Conversion
JSON Schema to Sample JSONTurn a JSON Schema into valid example data — one integer seed makes it reproducible, entirely on this device.Data Formats & Conversion
JSON Schema to TypeScriptPaste a JSON Schema, get TypeScript types — local $ref and $defs resolved, every dropped keyword named, entirely on this device.Data Formats & Conversion
JSON Schema to ZodTurn a JSON Schema into Zod source with z.infer types — every dropped constraint named, entirely on this device.Data Formats & Conversion
JSON to TypeScriptPaste sample JSON, get idiomatic TypeScript interfaces — multi-sample optionality and real unions, entirely on this device.Data Formats & Conversion
JSON to Go StructGenerate idiomatic Go structs with correct json tags and initialisms from sample JSON — entirely on this device.Data Formats & Conversion
JSON to C# ClassesGenerate C# classes or records from sample JSON, matched to System.Text.Json or Newtonsoft — entirely on this device.Data Formats & Conversion
JSON to Java POJOGenerate Java POJOs or records with the right annotation stack from sample JSON — entirely on this device.Data Formats & Conversion
JSON to Python / PydanticGenerate Pydantic v2 models, dataclasses or TypedDicts from sample JSON — entirely on this device.Data Formats & Conversion
JSON to Rust SerdeGenerate Rust serde structs from sample JSON with correct Option<T> optionality and exact 64-bit integers — entirely on this device.Data Formats & Conversion
JSON to Kotlin Data ClassGenerate Kotlin data classes with kotlinx.serialization or Jackson annotations from sample JSON — entirely on this device.Data Formats & Conversion
JSON to Swift CodableGenerate Swift Codable structs or classes from sample JSON, with CodingKeys for wire names — entirely on this device.Data Formats & Conversion
JSON to Zod SchemaPaste sample JSON, get a Zod schema plus z.infer types — optionality from multiple samples, entirely on this device.Data Formats & Conversion
JSON to GraphQL SDLPaste sample JSON, get GraphQL SDL types — nullability read from your samples, entirely on this device.Data Formats & Conversion
JSON to SQL DDLGenerate CREATE TABLE DDL from sample JSON for four SQL dialects, with three honest shapes for nested data — entirely on this device.Data Formats & Conversion
TypeScript to JSON SchemaTurn TypeScript interfaces and type aliases into a JSON Schema or Zod schema — unsupported types are named, never guessed — entirely on this device.Data Formats & Conversion
JSON to Protobuf DefinitionTurn sample JSON into a proto3 .proto message with stable field numbers — entirely on this device.Data Formats & Conversion
YAML Validator / LinterSyntax-check YAML with the exact line, column and cause of every error — plus lint warnings on valid files, entirely on this device.Data Formats & Conversion
YAML FormatterRe-indent YAML without losing comments or rewriting your numbers — entirely on this device.Data Formats & Conversion
YAML to JSON ConverterConvert YAML to JSON or JSON to YAML with anchors, multi-document streams and type quirks handled honestly — entirely on this device.Data Formats & Conversion
YAML to XML / CSV ConverterConvert YAML to XML, XML back to YAML, or list-shaped YAML to CSV/TSV — every dropped construct counted — entirely on this device.Data Formats & Conversion
YAML Diff / CompareCompare two YAML documents structurally — added, removed, changed and retyped keys, order-insensitive by default, entirely on this device.Data Formats & Conversion
XML FormatterPretty-print XML without corrupting mixed content, CDATA or comments — entirely on this device.Data Formats & Conversion
XML ValidatorCheck XML well-formedness with the exact line, column and paired open-tag position of every error — entirely on this device.Data Formats & Conversion
XML MinifierStrip insignificant whitespace from XML — mixed content, CDATA and preserved subtrees byte-identical, savings measured, entirely on this device.Data Formats & Conversion
XML Tree ViewerNavigate large XML as a collapsible tree — search names, see namespaces, copy any node's XPath, entirely on this device.Data Formats & Conversion
XPath TesterEvaluate an XPath 1.0 expression against your XML and see every matched node with its line and path — namespace prefixes bound explicitly, on this device.Data Formats & Conversion
XML DiffCompare two XML documents by structure — added, removed and changed elements, attributes and text, addressed by node path — entirely on this device.Data Formats & Conversion
XML Escape / UnescapeEscape text for XML element or attribute contexts — or unescape entities and character references — entirely on this device.Data Formats & Conversion
XML to JSON ConverterConvert XML to JSON — and back — with explicit attribute, array, and mixed-content semantics, entirely on this device.Data Formats & Conversion
XML to CSV ConverterTurn repeating XML records into CSV, TSV or an .xlsx workbook — you pick the row element — entirely on this device.Data Formats & Conversion
CSV to JSON ConverterConvert CSV to JSON or JSON to CSV — streaming to 100 MB, type-safe by default — entirely on this device.Data Formats & Conversion
CSV Editor & ViewerOpen a CSV in a grid, edit cells, rows and columns, then export it with your delimiter and quoting intact — entirely on this device.Data Formats & Conversion
CSV to SQL ConverterGenerate CREATE TABLE and batched INSERT statements from CSV or JSON, with dialect-correct quoting and escaping — entirely on this device.Data Formats & Conversion
CSV to Excel ConverterCSV to XLSX and back without Excel's mangling — leading zeros, IDs and dates survive, entirely on this device.Data Formats & Conversion
CSV to Markdown TableTurn CSV or TSV into a GitHub-ready Markdown pipe table — or paste a Markdown table and get CSV back — entirely on this device.Data Formats & Conversion
CSV to HTML TableTurn CSV or TSV into a semantic, injection-safe HTML table — or paste a table back and get CSV — entirely on this device.Data Formats & Conversion
CSV to TSV ConverterChange a CSV's delimiter to tab, semicolon, pipe or anything you type — re-quoted correctly, entirely on this device.Data Formats & Conversion
CSV ValidatorCheck a CSV against RFC 4180 and get every ragged row, stray quote and encoding problem with its row and column — on this device.Data Formats & Conversion
CSV Diff / CompareCompare two CSV exports row by row — added, removed and changed rows, cell-level detail, optional key-column match — entirely on this device.Data Formats & Conversion
Remove Duplicate Rows (CSV)Drop repeated CSV rows by whole row or chosen columns, then sort and filter what is left — header kept, counts shown, all on this device.Data Formats & Conversion
CSV Split & MergeSplit a CSV into parts by rows, part count or size — header repeated in every part — and merge exports back into one file, entirely on this device.Data Formats & Conversion
CSV Column ToolsPull one column out of a CSV as a plain list, or drop, reorder, rename and insert columns and download the new file — entirely on this device.Data Formats & Conversion
Excel Paste to JSON/MarkdownTurn a range copied from Excel, Google Sheets or Numbers into JSON or a Markdown table — entirely on this device.Data Formats & Conversion
TOML to JSON ConverterConvert TOML to JSON or JSON to TOML with tables, dotted keys and all four datetime types handled honestly — entirely on this device.Data Formats & Conversion
TOML to YAML ConverterConvert TOML to YAML or YAML to TOML with datetimes, nulls, anchors and comments all accounted for — entirely on this device.Data Formats & Conversion
Properties to YAML ConverterConvert .properties to nested YAML or YAML back to .properties — dotted keys, indexed lists and \uXXXX escapes handled honestly — entirely on this device.Data Formats & Conversion
Protobuf Wire DecoderDecode protobuf bytes with no .proto — field numbers, wire types and ranked value guesses, entirely on this device.Data Formats & Conversion
Avro Schema GeneratorPaste sample JSON, get a valid Avro .avsc — nullable unions with defaults and honest int-versus-long, entirely on this device.Data Formats & Conversion

Encoding & Escaping

Base64 EncoderConvert text or files to Base64 with correct Unicode handling — entirely on this device.Encoding & Escaping
Base64 DecoderDecode Base64 to text, bytes, or a downloadable file — tolerant of the real-world mess.Encoding & Escaping
Base64URL Encoder/DecoderEncode and decode RFC 4648 §5 URL-safe Base64 with JWT-strict padding control — entirely on this device.Encoding & Escaping
Base64 to Image ConverterPaste Base64 or a data: URI and see the image instantly — or turn an image file into copy-ready Base64 snippets, on this device.Encoding & Escaping
Base64 File ConverterDrop any file and stream it to Base64 with live progress — or turn Base64 back into a named, downloadable file, entirely on this device.Encoding & Escaping
Base64 to Hex ConverterPivot Base64 to hex and hex back to Base64 without a text detour — entirely on this device.Encoding & Escaping
Base32 Encoder/DecoderDecode and encode Base32 — RFC 4648, base32hex and Crockford, strict or tolerant — entirely on this device.Encoding & Escaping
Base58 Encoder/DecoderEncode and decode Base58 with the Bitcoin/IPFS alphabet — leading zeros preserved, entirely on this device.Encoding & Escaping
Hex Encoder/Decoder + Dump ViewerConvert bytes to hex and back, and inspect any file in a classic offset/hex/ASCII dump — entirely on this device.Encoding & Escaping
Binary Text ConverterTurn binary byte groups into text and text into binary — with decimal, octal and hex views — entirely on this device.Encoding & Escaping
URL Encoder/DecoderPercent-encode and decode URLs with the encodeURIComponent vs encodeURI difference made explicit — entirely on this device.Encoding & Escaping
HTML Entity Encoder/DecoderConvert characters to HTML entities and back — named, decimal or hex — with a searchable reference table, entirely on this device.Encoding & Escaping
HTML Context EscaperEscape a string for the HTML element, attribute, JavaScript or URL context — OWASP output-encoding rules applied per sink, entirely on this device.Encoding & Escaping
Punycode / IDN ConverterConvert xn-- domains to Unicode and back, label by label, with mixed-script flags — entirely on this device.Encoding & Escaping
Unicode Escape ToolEscape text to \uXXXX, \u{…}, \xXX, CSS, U+ or HTML hex notation and decode any mix of them back — entirely on this device.Encoding & Escaping
String Escaper (Multi-language)Escape or unescape a string literal for JSON, JavaScript, Java, C#, C, Python, SQL or POSIX shell — entirely on this device.Encoding & Escaping
ROT13 / Caesar CipherRotate text through ROT13, any Caesar shift, ROT5, ROT18 or ROT47 — with an all-25-shifts panel for unknown puzzles, entirely on this device.Encoding & Escaping
XOR Encoder / Brute-forcerApply a repeating XOR key to text, hex or Base64, or rank all 256 single-byte keys by printable ratio — entirely on this device.Encoding & Escaping
Morse Code TranslatorTranslate text to ITU Morse code and Morse back to text, with tolerant decoding and optional audio — entirely on this device.Encoding & Escaping
GZip / zlib ToolDecompress or compress gzip, zlib and raw DEFLATE streams — pastes or files, entirely on this device.Encoding & Escaping
Data URI GeneratorTurn any file or text into a self-contained data: URI — MIME sniffed or chosen, Base64 or percent-encoded, entirely on this device.Encoding & Escaping

Hashing & Checksums

MD5 Hash GeneratorCompute MD5 checksums of text, hex or Base64 bytes and files up to 64 MB — entirely on this device.Hashing & Checksums
SHA-1 Hash GeneratorCompute the SHA-1 digest of text, hex or Base64 bytes — entirely on this device.Hashing & Checksums
SHA-256 Hash GeneratorCompute the SHA-256 digest of text or a file — hex and Base64, entirely on this device.Hashing & Checksums
SHA-384/512 Hash GeneratorCompute the SHA-512 or SHA-384 digest of text or raw bytes — hex and Base64, entirely on this device.Hashing & Checksums
SHA-3 / Keccak GeneratorSee the SHA-3 and Keccak digests of the same bytes side by side — including Ethereum keccak256, computed entirely on this device.Hashing & Checksums
CRC CalculatorCompute CRC32, CRC16 or CRC8 with any polynomial, init, reflection and xorout — entirely on this device.Hashing & Checksums
File Checksum VerifierDrop a file, paste the published checksum, get a MATCH or MISMATCH verdict — multi-GB downloads verified entirely on this device.Hashing & Checksums
Multi-hash GeneratorHash one input with 16 algorithms at once — MD5 to BLAKE3 — and see which rows match a digest you already hold, entirely on this device.Hashing & Checksums
HMAC GeneratorCompute HMAC-SHA-256 and family with the key and message decoded exactly as your API sees them — entirely on this device.Hashing & Checksums
Hash IdentifierPaste a hash and see every algorithm it could be — prefixes parsed, parameters read, ambiguity shown honestly.Hashing & Checksums

Passwords & Credentials

Bcrypt Generator + VerifierGenerate bcrypt hashes at any cost factor and check a password against an existing hash — the password never leaves this device.Passwords & Credentials
Argon2 Generator + VerifierHash a password with Argon2id at tunable memory, time and parallelism — or verify an existing hash, on this device.Passwords & Credentials
Htpasswd GeneratorBuild .htpasswd lines for Apache or Nginx basic auth — bcrypt, APR1 or SHA-1, hashed on this device.Passwords & Credentials
Password GeneratorGenerate provably unbiased, cryptographically secure passwords — on a page that stores nothing and sends nothing.Passwords & Credentials
Passphrase Generator (Diceware)Build a memorable passphrase from the EFF long wordlist — with the exact entropy, not a colour-coded guess.Passwords & Credentials
Password Strength CheckerSee exactly why a password scores the way it does — named rules, live entropy and an offline crack-time estimate, all on this device.Passwords & Credentials
Pwned Password CheckHash a password to its SHA-1 prefix and match a Pwned Passwords range response — entirely on this device.Passwords & Credentials
API Key & PIN GeneratorGenerate prefixed API keys and numeric PINs by the batch — on a page that stores nothing and sends nothing.Passwords & Credentials

OTP & 2FA

TOTP Generator / DebuggerPaste a Base32 secret and see the live RFC 6238 code, the drift window and every step of the math — on this device only.OTP & 2FA

IDs & Randomness

UUID v4 GeneratorGenerate one or 100,000 random v4 UUIDs in every notation a codebase demands — entirely on this device.IDs & Randomness
UUID v7 GeneratorGenerate time-sortable v7 UUIDs in bulk — the embedded timestamp decoded live, entirely on this device.IDs & Randomness
UUID v1 GeneratorGenerate v1 UUIDs in bulk with timestamp, clock sequence and node decoded live — entirely on this device.IDs & Randomness
UUID v3 GeneratorDerive deterministic v3 UUIDs from namespace + name via MD5 for legacy interop — same inputs, same UUID, entirely on this device.IDs & Randomness
UUID v5 GeneratorDerive deterministic v5 UUIDs from namespace + name via SHA-1 — the RFC-preferred name-based version, entirely on this device.IDs & Randomness
UUID v6 GeneratorGenerate time-sortable v6 UUIDs — v1's fields reordered for index locality, decoded live, entirely on this device.IDs & Randomness
UUID Decoder / InspectorPaste any UUID and read its version, variant and embedded timestamp — every notation accepted, entirely on this device.IDs & Randomness
GUID GeneratorGenerate .NET-style GUIDs in bulk — uppercase {braces}, registry form and copy-ready C# snippets, entirely on this device.IDs & Randomness
ULID Generator + DecoderGenerate time-sortable ULIDs — bulk, monotonic, Crockford base32 — and decode any ULID’s timestamp, entirely on this device.IDs & Randomness
Snowflake ID Generator + DecoderDecode a Snowflake ID to its timestamp, worker and sequence, or generate one for the Twitter or Discord epoch — entirely on this device.IDs & Randomness
MongoDB ObjectId GeneratorGenerate valid 24-hex MongoDB ObjectIds and decode any ObjectId to its embedded timestamp and BSON structure — entirely on this device.IDs & Randomness
Random String GeneratorGenerate cryptographically secure random strings, tokens and raw bytes — on a page that stores nothing and sends nothing.IDs & Randomness
Random Number GeneratorGenerate random numbers, roll dice, or shuffle and pick from a list — unbiased and entirely on this device.IDs & Randomness
ID Format Comparison HubCompare UUID, ULID, Snowflake and ObjectId on size, sortability, timestamps and use cases — with live samples, entirely on this device.IDs & Randomness

JWT & Tokens

JWT DecoderDecode any JWT into header, payload and a plain-language claims table — expiry checked live, zero third-party code on this page.JWT & Tokens
JWT VerifierCheck a JWT's signature against your own key — HS, RS, ES, PS or EdDSA — with claim and clock-skew checks, entirely on this device.JWT & Tokens
JWT Generator / SignerBuild a header and payload, sign with your own key, and copy the token — the key never leaves this tab.JWT & Tokens
JWK GeneratorGenerate a key and get a proper JWK — alg, use and an RFC 7638 kid already stamped, with the JWKS wrapper you actually deploy.JWT & Tokens
PEM to JWK ConverterPaste a PEM key or certificate, get a JWK with alg, use and kid stamped — and back again, entirely on this device.JWT & Tokens

PKI Certificates & SSH

Certificate DecoderRead what a certificate actually says — who it is for, when it expires, and every extension — without it leaving your device.PKI Certificates & SSH
CSR DecoderDecode a PKCS#10 request — subject, key, requested SANs and attributes — and see what a CA will reject, entirely on this device.PKI Certificates & SSH
RSA Key GeneratorGenerate an RSA, EC or Ed25519 keypair in your browser and download it as PKCS#8 and SPKI PEM.PKI Certificates & SSH
ASN.1 DecoderRead any DER or BER blob as a tag, length and offset tree beside a synchronized hex view — entirely on this device.PKI Certificates & SSH
SSH Key GeneratorGenerate an SSH keypair on this device and copy the exact two artifacts SSH consumes: the authorized_keys line and the openssh-key-v1 file.PKI Certificates & SSH

Encryption & PGP

AES Encrypt / DecryptEncrypt or decrypt text and files with AES-GCM, CBC or CTR — the passphrase and the data never leave this device.Encryption & PGP
RSA Encrypt / DecryptEncrypt a short message with an RSA public key and decrypt it with the private key — RSA-OAEP, entirely on this device.Encryption & PGP

Web Security

CSP GeneratorBuild a Content-Security-Policy directive by directive — with real nonce and hash sources, a Report-Only toggle and the server snippet for it.Web Security
CSP EvaluatorPaste a policy and read what the browser will enforce, what it will ignore, and every weakness it leaves open — each finding with its CSP Level 3 clause.Web Security
Security Headers ExplainerPaste a response header block and read its security posture header by header — present, missing or weak, each verdict citing its spec.Web Security
SRI Hash GeneratorHash a script or stylesheet and get the integrity= attribute the browser checks — computed on this device, never uploaded.Web Security
CORS TesterDescribe the request, paste the response headers, and see exactly which CORS check the browser fails — on this device.Web Security
CORS Header GeneratorEmit a complete CORS configuration for nginx, Apache, Express or Caddy — preflight, Vary: Origin and credentials handled — or read the headers you already have.Web Security

SAML OAuth & OIDC

SAML DecoderPaste a SAML blob from a browser trace and read it — both bindings auto-detected, assertion semantics extracted, entirely on this device.SAML OAuth & OIDC
PKCE GeneratorMint a PKCE code_verifier and its S256 code_challenge on this device — RFC 7636 lengths, and a verify mode for a pair you already have.SAML OAuth & OIDC

Regex

Regex Tester (JavaScript)Test JavaScript regular expressions live — highlighted matches, groups and replace preview, entirely on this device.Regex
Regex ExplainerRead someone else's JavaScript regular expression token by token — every group, quantifier and flag spelled out, entirely on this device.Regex
Regex VisualizerSee the shape of a regular expression: branches, loops and groups drawn as a railroad diagram you can download as SVG — entirely on this device.Regex
Regex Patterns LibraryBrowse copy-paste regex patterns — pragmatic and strict variants, CI-verified match tables and six-language usage for each.Regex
Email RegexThe email regex that tells the truth — pragmatic and RFC 5321 strict variants, fifteen CI-verified rows and the live tester preloaded.Regex
Phone Number RegexThe E.164 phone regex pair — an optional-plus gate and the strict international form, with honest libphonenumber advice and live testing.Regex
IP Address RegexOctet-accurate IPv4 matching — 999.1.1.1 fails; leading-zero-tolerant and canonical variants with CI-verified rows and the live tester.Regex
URL RegexA pragmatic http(s) link gate and a strict host-checking variant — CI-verified match rows, six language spellings, live tester preloaded.Regex
Date Regex (YYYY-MM-DD)The ISO date shape gate plus a range-checking strict variant — honest about calendars, CI-verified, preloaded in the live tester.Regex
Numbers-Only RegexDigits-only validation settled — the five-character gate plus a canonical-integer strict variant, CI-verified rows and live testing.Regex
Password RegexLookahead password policies explained honestly — 8-plus and strict 12-plus four-class gates, NIST caveats, safe on-device testing.Regex
UUID RegexUUID validation by layout and by meaning — a case-insensitive 8-4-4-4-12 gate plus a version-and-variant strict form, CI-verified.Regex
IPv6 RegexFull-form and ::-compressed IPv6 matching per RFC 4291 — the library's honest inversion, CI-verified rows, live tester preloaded.Regex
Regex Cheat SheetLook up any JavaScript regex construct — syntax, meaning and a worked example whose result this page computes, with the tester right above the table.Regex
Regex Replace & ExtractRun your own pattern over a whole body of text — replace across it, extract every match, or keep only matching lines, entirely on this device.Regex

Time, Date & Scheduling

Cron Expression Parser / ExplainerExplain any cron expression in plain English — per-field validation and the next 10 runs in any timezone, with DST flags — entirely on this device.Time, Date & Scheduling
Cron Expression GeneratorPick minutes, hours and days visually and get a correct cron expression with plain-English read-back — entirely on this device.Time, Date & Scheduling
Quartz Cron ToolParse and build Quartz cron expressions — seconds, year field, ? L W # tokens — with next fire times in any timezone, entirely on this device.Time, Date & Scheduling
AWS EventBridge Cron ToolValidate AWS cron() and rate() schedules with EventBridge's real rules — ? required, 1 = Sunday, UTC firing — entirely on this device.Time, Date & Scheduling
Jenkins Cron ToolValidate and explain Jenkins build schedules — H hash tokens, aliases and TZ lines — with honest run windows, entirely on this device.Time, Date & Scheduling
Spring Cron ToolParse and validate Spring @Scheduled 6-field cron — seconds first, ? equals *, 0 or 7 = Sunday — with next runs in any timezone, entirely on this device.Time, Date & Scheduling
Systemd OnCalendar ConverterTurn a crontab schedule into systemd OnCalendar syntax with a ready-to-install .timer unit — entirely on this device.Time, Date & Scheduling
Cron Examples LibraryBrowse copy-paste cron schedules — live next runs and Quartz, AWS, Kubernetes and GitHub Actions forms for each.Time, Date & Scheduling
Cron Every 5 MinutesThe five-minute cron line ready to paste — */5 * * * * with live next runs and the Quartz, AWS, Kubernetes and GitHub Actions forms beside it.Time, Date & Scheduling
Cron Every 30 MinutesHalf-hourly cron settled — */30 * * * * with live next runs, the 0,30 twin spelling, and every scheduler dialect on one page.Time, Date & Scheduling
Cron Every HourTop-of-hour cron at a glance — 0 * * * * with live next runs, the @hourly macro, and each dialect's form ready to copy.Time, Date & Scheduling
Cron Every Day at MidnightThe daily midnight line — 0 0 * * * with live next runs, whose-midnight caveats and all four dialect forms ready to paste.Time, Date & Scheduling
Cron Every MondayMonday cron without numbering doubt — 0 0 * * 1 previewed live, with the Sunday-first dialects called out explicitly.Time, Date & Scheduling
Cron Every Weekday at 9amWeekday-morning cron — 0 9 * * 1-5 with live next runs, the whose-9am question answered honestly, and every dialect form.Time, Date & Scheduling
Cron First of the MonthMonth-start cron — 0 0 1 * * with live next runs, the @monthly macro and each scheduler's spelling ready to copy.Time, Date & Scheduling
Cron Last Day of the MonthNo classic one-liner exists — the honest 28–31 date-guard recipe with live next runs, plus the Quartz and EventBridge L forms.Time, Date & Scheduling
Cron Every 90 MinutesNinety minutes takes two cron lines — the exact interleaved pair with live next runs, or one EventBridge rate rule.Time, Date & Scheduling
Crontab File ValidatorLint an entire crontab file — env lines, schedules, % gotchas, missing trailing newline — with per-line errors, entirely on this device.Time, Date & Scheduling
Cron Timezone ConverterConvert a cron schedule to another timezone — DST handled honestly with dated dual expressions, entirely on this device.Time, Date & Scheduling
Unix Timestamp ConverterConvert epoch timestamps to human dates and back — unit auto-detected, exact to the nanosecond, entirely on this device.Time, Date & Scheduling
ISO 8601 / RFC 3339 FormatterPaste any date or epoch and read it in every standard form at once — offset decoded, standards checked, entirely on this device.Time, Date & Scheduling
Timezone ConverterConvert a date and time between timezones and line up a meeting across cities — DST-aware, entirely on this device.Time, Date & Scheduling
Date Difference CalculatorCount the days between two dates — both conventions labeled, inclusive and exclusive — with weekday-only counts and a calendar breakdown, entirely on this device.Time, Date & Scheduling
Time Duration CalculatorTurn hh:mm:ss, unit words or ISO 8601 durations into every unit at once — or sum a whole list — entirely on this device.Time, Date & Scheduling
Week Number ToolSee the ISO week number for today or any date — US convention beside it — and turn a week number back into its Monday–Sunday dates, on this device.Time, Date & Scheduling
Date Add / Subtract CalculatorShift a date by years, months, weeks, days, hours or minutes — end-of-month clamping stated, never guessed — entirely on this device.Time, Date & Scheduling
Age CalculatorExact age in years, months and days from a date of birth — Feb 29 and month-end policies stated, never silently picked — entirely on this device.Time, Date & Scheduling
Strftime / Format Cheat SheetEvery strftime token with an engine-rendered example, portability columns and a live format preview — entirely on this device.Time, Date & Scheduling
Working Days / SLA CalculatorWorking-day counts and SLA deadlines over a calendar you control — weekend sets, paste-in holiday lists, counting conventions stated — entirely on this device.Time, Date & Scheduling
Discord Timestamp GeneratorTurn a date, epoch or pasted <t:…> code into all seven Discord timestamp styles — previewed in your zone, entirely on this device.Time, Date & Scheduling

Web & HTTP

HTTP Status Codes ReferenceEvery HTTP status code with its meaning, RFC citation, cacheability and handler snippets — searchable instantly, entirely on this device.Web & HTTP
HTTP Headers ReferenceEvery HTTP header field with its status, RFC clause and direction — plus builders for Cache-Control, CSP, HSTS and CORS values, all on this device.Web & HTTP
Curl to Code ConverterPaste a curl command and read back idiomatic client code in 12 languages — parsed on this device, with every unsupported flag named.Web & HTTP
Curl Command BuilderTurn a form into a correct curl command — POSIX-quoted values, per-flag explanations, and a round-trip check — entirely on this device.Web & HTTP
HAR File ViewerOpen a .har capture and read the waterfall, per-phase timings, sizes and failures — the file never leaves this device.Web & HTTP
URL Parser / InspectorSee every component of any URL — host in punycode and Unicode, decoded query table, homograph check — entirely on this device.Web & HTTP
Query String to JSONTurn any query string into structured JSON and back — bracket nesting, array conventions and + handling made explicit — entirely on this device.Web & HTTP
User-Agent ParserDecode any user-agent string — or 100,000 log lines — into browser, OS and device fields with bots called out, entirely on this device.Web & HTTP
What Is My User AgentSee the user-agent string this browser sends, parsed into browser, OS and device — with screen, locale and Client Hints, read on this device.Web & HTTP
MIME Type LookupFind the right Content-Type for any file extension — every known extension, compressibility and copyable server config, straight from mime-db.Web & HTTP
Basic Auth Header GeneratorBuild the exact Authorization: Basic line from a username and password — or read one back — with RFC 7617 checks on this device.Web & HTTP

Network, DNS & IP

DNS LookupLook up a domain's DNS records from the browser: you run the named resolver's request yourself, and the answer is decoded here.Network, DNS & IP
DMARC Record GeneratorCompose or check DMARC, SPF and DKIM records with the risky terms named and the SPF lookup count shown — on this device, with nothing resolved.Network, DNS & IP
IPv4 Subnet CalculatorEvery subnet number from one IP and prefix — with the binary math shown, and /31 and /32 handled correctly — entirely on this device.Network, DNS & IP
Visual Subnet CalculatorSplit any IPv4 block into a tree, join siblings back, and see what each cloud provider actually reserves — entirely on this device.Network, DNS & IP
MAC Address Vendor LookupPaste a MAC in any notation and get the IEEE-registered assignee, the block that covers it, and an honest answer when no vendor exists — on this device.Network, DNS & IP
Port Number ReferenceType a port number and see every service the IANA registry lists for it across TCP, UDP and SCTP — plus what really runs there.Network, DNS & IP

CSS Tools

CSS Gradient GeneratorCompose linear, radial and conic gradients with multi-stop editing and copy modern CSS — entirely on this device.CSS Tools
Box Shadow GeneratorCompose layered CSS box-shadows with live light and dark preview and a smooth-shadow wizard — entirely on this device.CSS Tools
Border Radius GeneratorDesign asymmetric 8-value corners and organic blob shapes against a live preview and copy working CSS — entirely on this device.CSS Tools
Clip-path GeneratorDraw a clip-path with draggable points on a live preview and copy the CSS — entirely on this device.CSS Tools
Glassmorphism GeneratorDesign frosted-glass CSS with live backdrop blur over a busy preview — entirely on this device.CSS Tools
Cubic Bezier GeneratorDrag an easing curve, preview the motion and copy cubic-bezier() — plus a modern linear() spring & bounce generator — on this device.CSS Tools
CSS Animation GeneratorBuild a @keyframes timeline, tune the animation shorthand and preview it live, then copy working CSS — entirely on this device.CSS Tools
Flexbox Playground / GeneratorToggle every flexbox container and item property against a live preview and copy working CSS — entirely on this device.CSS Tools
Grid Generator / PlaygroundBuild grid tracks and named template areas against a live preview and copy working CSS — entirely on this device.CSS Tools
Aspect Ratio CalculatorReduce any width and height to its simplest ratio and copy modern aspect-ratio CSS — entirely on this device.CSS Tools
Px to Rem ConverterPx ↔ rem at any root font size — single values, whole CSS blocks, and a live 1–100 px table — entirely on this device.CSS Tools
CSS clamp() CalculatorTurn min and max sizes at two viewports into a correct rem-based clamp() expression, with the math shown — entirely on this device.CSS Tools
Fluid Type Scale GeneratorTurn a base size, viewport range and modular ratio into a fluid clamp() type scale, exported as CSS custom-property tokens — entirely on this device.CSS Tools
Font Stack GeneratorPick a system or web-safe font stack, preview it in your own fonts, and copy a font-family value with a guaranteed fallback — entirely on this device.CSS Tools
CSS FormatterFormat messy or minified CSS, SCSS or LESS to editor-consistent Prettier output — entirely on this device.CSS Tools
CSS MinifierMinify CSS with an honest size report — raw, minified and gzip bytes — entirely on this device.CSS Tools
CSS ValidatorValidate CSS and see syntax errors, unknown properties and bad values with line and column — entirely on this device.CSS Tools
CSS Specificity CalculatorSee the (a,b,c) specificity of any selector, compare two to learn which wins, with a per-token breakdown — entirely on this device.CSS Tools
CSS to Tailwind ConverterPaste CSS and map each declaration to Tailwind utility classes, with every unmapped declaration listed honestly — entirely on this device.CSS Tools
CSS StatsAnalyze a whole stylesheet on this device: rule, selector and declaration counts, a specificity graph, unique colors and font sizes, and !important totals.CSS Tools

Color Tools

Color ConverterPaste any CSS color and read every notation at once — HEX, RGB, HSL, OKLCH, LAB and more — entirely on this device.Color Tools
OKLCH Picker / ConverterPick perceptual OKLCH colors and watch the sRGB and Display-P3 gamut boundaries instead of discovering the clip later — entirely on this device.Color Tools
Contrast CheckerCheck any two colors against the WCAG 2 contrast ratios for normal text, large text and UI components — entirely on this device.Color Tools
APCA Contrast CheckerCompute the APCA Lc value for a text and background pair, with polarity, the font size and weight lookup, and the WCAG 2 ratio beside it — entirely on this device.Color Tools
Tints & Shades Scale GeneratorTurn one brand color into an even 50–950 shade ramp interpolated in OKLCH — entirely on this device.Color Tools
Color Blindness SimulatorPreview a palette or an image as protanopia, deuteranopia and tritanopia render it — entirely on this device.Color Tools
Image Palette ExtractorExtract the dominant colors from any image with share percentages, plus a pixel-exact eyedropper — entirely on this device.Color Tools
Named CSS Colors ReferenceAll 148 CSS named colors with hex, rgb, hsl and oklch, plus contrast against white and black — entirely on this device.Color Tools

SVG Tools

SVG OptimizerRun SVGO with every toggle explained, measured before/after bytes and a real diff — entirely on this device.SVG Tools
SVG to JSX ConverterTurn SVG markup into a React or React Native component — attributes mapped, nothing uploaded.SVG Tools
SVG to CSS EncoderEncode an SVG into a url() data URI for background-image, mask-image or a custom property — url-encoded, xmlns-checked, entirely on this device.SVG Tools
SVG Viewer and EditorSee any SVG render beside its markup — viewBox and aspect ratio resolved, every script, handler and external reference named, entirely on this device.SVG Tools
SVG to PNG ConverterRasterize SVG markup to a PNG at any size, scale or background — rendered by your own browser, never uploaded.SVG Tools
Blob GeneratorGenerate a seeded SVG blob, wave or pattern and copy the exact markup — entirely on this device.SVG Tools

HTML & Markup

HTML FormatterPretty-print messy or minified HTML into clean, editor-consistent Prettier output — entirely on this device.HTML & Markup
HTML MinifierCollapse the whitespace a browser ignores while the whitespace it renders survives — pre, textarea and inline-tag gaps intact, every removal listed and measured.HTML & Markup
HTML Entities ReferenceFind the HTML code for any symbol — the named reference, its Unicode name, and its decimal and hex spellings, entirely on this device.HTML & Markup
Meta Tag GeneratorBuild a paste-ready <head> block — title, description, canonical and robots — with conflict checks, entirely on this device.HTML & Markup
Open Graph PreviewCompose Open Graph and Twitter card tags and preview the card locally — nothing is fetched, nothing uploaded.HTML & Markup
HTML Table GeneratorLay out a table in a grid and get accessible markup — captions, header scopes and spans — entirely on this device.HTML & Markup
HTML to JSX ConverterTurn HTML into a React component or a Pug template — attributes mapped to React props, entirely on this device.HTML & Markup
HTML to Text ConverterTurn HTML into readable plain text with block structure preserved and entities decoded — entirely on this device.HTML & Markup
Schema Markup GeneratorFill a typed form and get a valid JSON-LD script block for eight schema.org types, with required fields checked — entirely on this device.HTML & Markup

JavaScript & TypeScript

JavaScript BeautifierBeautify messy or minified JavaScript and JSX into clean, editor-consistent Prettier output — entirely on this device.JavaScript & TypeScript
JS MinifierMinify JavaScript with Terser and read an honest size report — original, minified and gzip bytes — entirely on this device.JavaScript & TypeScript
JavaScript ObfuscatorObfuscate JavaScript to deter casual reading — not encryption — entirely on this device.JavaScript & TypeScript
TypeScript to JavaScriptStrip TypeScript types to plain JavaScript as you type — interfaces, generics and annotations gone, your syntax untouched — entirely on this device.JavaScript & TypeScript
Keycode / KeyboardEvent InspectorPress any key to see event.key, event.code and legacy keyCode with location and modifier state — entirely on this device.JavaScript & TypeScript
Big-O Cheat SheetLook up the time and space complexity of every common data structure and sorting algorithm — best, average and worst case, entirely on this device.JavaScript & TypeScript

Favicons & App Icons

Favicon GeneratorTurn one image into the complete modern favicon set — ICO, SVG, Apple touch and PWA icons, manifest and HTML — entirely on this device.Favicons & App Icons
Favicon from Text / EmojiType a letter or emoji, pick shape and colors, and download the complete modern favicon set — generated entirely on this device.Favicons & App Icons
Web Manifest GeneratorFill in name, colors, display mode and icons and get a valid site.webmanifest plus the link tag — built entirely on this device.Favicons & App Icons
App Icon Set GeneratorDrop one 1024px image and download every iOS and Android icon size — Contents.json and mipmap folders included, nothing uploaded.Favicons & App Icons

Server Config & SEO Files

Robots.txt Tester (Paste)Check whether a URL is allowed or blocked for any crawler by pasted robots.txt rules — with the deciding rule quoted, entirely on this device.Server Config & SEO Files
Robots.txt GeneratorCompose robots.txt groups, paths and sitemap lines from a form, then read the parser's report on the emitted file before you copy it — entirely on this device.Server Config & SEO Files
Llms.txt GeneratorBuild an llms.txt index for your site — title, summary and curated link sections — entirely on this device.Server Config & SEO Files
Htaccess Redirect GeneratorBuild .htaccess redirect rules — bulk 301/302 maps plus HTTPS, www and trailing-slash canonicals — with paths escaped and rule order checked.Server Config & SEO Files
Ads.txt Generator & ValidatorGenerate and validate IAB Tech Lab compliant Authorized Digital Sellers (ads.txt) files — entirely on this device.Server Config & SEO Files
Caddyfile GeneratorGenerate modern Caddy web server configurations with automated HTTPS, reverse proxy forwarding, compression, and security headers.Server Config & SEO Files

Docker

Docker Run to Compose ConverterConvert docker run commands into a modern compose.yaml with a flag-by-flag conversion report — entirely on this device.Docker
Compose to Docker Run ConverterTurn compose services back into docker run commands with a flag-by-flag conversion report — entirely on this device.Docker
Compose to Kubernetes ConverterConvert a compose file into Kubernetes manifests with Kompose-compatible semantics — entirely on this device.Docker
Dockerfile LinterLint a Dockerfile against 27 hadolint-compatible rules with line-anchored findings — entirely on this device.Docker
Dockerfile GeneratorPick a stack, choose the options, get a commented multi-stage Dockerfile — entirely on this device.Docker
Dockerignore GeneratorGenerate clean, production-shaped .dockerignore files with stack presets to shrink build contexts and protect secrets.Docker
Compose Validator / FormatterValidate and format compose.yaml against the official compose-spec schema — entirely on this device.Docker
Docker Healthcheck GeneratorGenerate robust Dockerfile HEALTHCHECK and docker-compose health probes with presets for Node, Postgres, Redis, and MySQL — entirely in your browser.Docker
Docker EXPOSE vs Ports ExplainerUnderstand container port exposure, host publishing (-p), interface binding, and firewall implications — entirely on this device.Docker
Docker Image Name Parser & FormatterParse, decompose, and format OCI and Docker image references into canonical registry, namespace, and tag components — entirely on this device.Docker

Kubernetes

Kubernetes CronJob HelperEdit a CronJob schedule with a live plain-English readout, timezone-aware next runs and a ready-to-apply manifest — entirely on this device.Kubernetes
Kubernetes Manifest GeneratorFill a guided form, get schema-validated Deployment, Service and Ingress YAML — entirely on this device.Kubernetes
Kubernetes YAML ValidatorCheck manifests against strict per-kind Kubernetes schemas with line-anchored findings — entirely on this device.Kubernetes
Kubernetes Resource CalculatorTurn usage numbers into requests, limits and quota YAML with the QoS class explained — entirely on this device.Kubernetes
Kubernetes RBAC Viewer & Role BuilderVisualize Kubernetes Role and ClusterRole permissions as a security matrix or build least-privilege RBAC YAML safely in your browser.Kubernetes
Kubectl Command BuilderCompose kubectl commands task-first and keep the cheat sheet at hand — entirely on this device.Kubernetes
Kubernetes Secret Base64 ToolEncode and decode Secret values with the YAML wrapper handled and the newline trap defused — entirely on this device.Kubernetes
API Deprecation CheckerFind deprecated apiVersions in pasted manifests and get the exact replacement — entirely on this device.Kubernetes
Pod QoS Class CheckerDeduce Kubernetes QoS classes (Guaranteed, Burstable, BestEffort) and node eviction priorities from container resource specs — entirely on this device.Kubernetes
Kubernetes Taints & Tolerations SimulatorSimulate pod scheduling against tainted nodes, verify matching logic, and output clean toleration YAML — entirely on this device.Kubernetes
Pod CIDR PlannerPlan Kubernetes Cluster Pod CIDR topologies, calculate max node capacity, subnet slices, and address exhaustion limits — entirely on this device.Kubernetes
Kubernetes Label Selector TesterTest equality-based and set-based Kubernetes label selector queries against pod metadata with matched resource breakdowns — entirely on this device.Kubernetes

Git & Version Control

Git Undo Commit & Command BuilderPick the task, get the exact git command — with safety labels and a verify step.Git & Version Control
Gitignore GeneratorMulti-select your stacks and get one merged, deduplicated .gitignore — with every rule explained, not just dumped.Git & Version Control
Conventional Commits HelperCompose a spec-correct Conventional Commits message from a form — or paste one and lint it with commitlint-compatible checks.Git & Version Control
Semver ToolkitValidate versions, compare precedence, test npm ranges — caret vs tilde made explicit — and calculate bumps.Git & Version Control
Changelog GeneratorPaste git log output, get a grouped CHANGELOG.md section — Conventional Commits sorted into Features, Fixes and Breaking Changes.Git & Version Control
Git Config GeneratorGenerate an optimized .gitconfig with identity, default branch, pull rebase, and time-saving aliases.Git & Version Control
Gitattributes GeneratorGenerate cross-platform .gitattributes configurations with normalized line endings, Git LFS tracking, and binary guards.Git & Version Control
Git Branch Naming Rule Builder & ValidatorCompose and validate git branch names against team conventions and git-check-ref-format syntax rules — entirely on this device.Git & Version Control
Git URL ConverterConvert Git repository URLs instantly between SSH, HTTPS, and Web formats with organization and repository parsing.Git & Version Control

CI/CD

GitHub Actions Cron HelperCompose a correct on.schedule cron for GitHub Actions — local time to UTC, DST duality, next runs and YAML — entirely on this device.CI/CD
GitHub Actions Workflow GeneratorCompose a workflow YAML from triggers, a stack preset and jobs — with GitHub's real constraints checked as you build.CI/CD
GitLab CI Generator / ValidatorBuild a .gitlab-ci.yml from stages, jobs and rules — or paste yours and validate it against the GitLab CI schema.CI/CD
Dependabot Config GeneratorBuild a valid dependabot.yml — ecosystems, directories, schedules, groups and ignore rules — without memorizing the options reference.CI/CD
CI Workflow Validator (Multi-CI)Paste a CI workflow and validate it against its vendored SchemaStore schema — GitHub Actions, GitLab CI, CircleCI and more.CI/CD
CODEOWNERS File GeneratorBuild production-grade CODEOWNERS files for GitHub, GitLab, and Bitbucket with path rules and team handles — entirely on this device.CI/CD
Pre-Commit Config GeneratorBuild production-grade .pre-commit-config.yaml hook configurations with curated multi-language presets — entirely on this device.CI/CD

Linux & CLI

Chmod CalculatorConvert file permissions between checkbox, octal and symbolic forms, decode ls -l strings, and copy the exact chmod command — entirely on this device.Linux & CLI
Systemd Unit GeneratorFill in what your service does and get a .service unit with each directive explained and cited — built entirely on this device.Linux & CLI
Sed TesterWrite a sed script, paste your text, and watch every address, substitution and hold-space command run on this device.Linux & CLI
Awk TesterRun real awk on your own text in this tab — fields, BEGIN/END, printf and arrays, with stdout, stderr and the exit code shown.Linux & CLI
Tar Command BuilderPick the task and get the exact tar command — quoted for POSIX shells, with bsdtar and GNU tar shown separately where they differ.Linux & CLI
Find Command BuilderDescribe what you are looking for and get the find command, with every predicate explained and the destructive actions marked.Linux & CLI
Rsync Command BuilderPick the sync you mean and get the rsync command — the -a flags spelled out, the dangerous ones marked, and a dry run offered first.Linux & CLI
FFmpeg Command BuilderPick the job — convert, extract audio, scale, trim, GIF, compress or strip metadata — and copy the ffmpeg command; nothing is transcoded on this page.Linux & CLI
OpenSSL Command BuilderPick a PKI job and read off the exact openssl line — every flag explained, quoting handled, and nothing executed on this page.Linux & CLI
Bash Parameter Expansion ExplainerEvery ${…} form — defaults, substrings, pattern removal, substitution — with what it does, which bash added it, and a worked example.Linux & CLI
Exit Code & Signal ReferenceYour process exited 137 — this page says what killed it, how the 128+N signal band works, and where macOS and Linux numbering differs.Linux & CLI
Bash getopts Script BuilderScaffold POSIX-compliant, error-hardened Bash CLI scripts with getopts option parsing and help menus — entirely on this device.Linux & CLI
Bash Test Operators ReferenceInteractive reference for Bash conditional test operators: file, string, and integer comparisons in [ ... ] and [[ ... ]].Linux & CLI
ANSI Color Codes & Terminal FormatterInteractive ANSI escape sequence generator for terminal styling, 16/256/TrueColor palettes, and code snippets — entirely on this device.Linux & CLI
Linux Sysctl & Ulimit Tuner ReferenceInteractive kernel tunables reference for sysctl.conf and limits.conf covering network performance and memory — entirely on this device.Linux & CLI
SSHD Hardening Config GeneratorGenerate production-grade, CIS and Mozilla compliant OpenSSH server (sshd_config) hardening configurations.Linux & CLI
Linux /etc/fstab Generator & ValidatorGenerate and validate Linux /etc/fstab mount entries with persistent UUIDs, mount options, and boot safety linting — entirely on this device.Linux & CLI
Linux iptables & UFW Rule GeneratorGenerate secure iptables, UFW, and nftables firewall rules with stateful connection tracking and rate limiting — entirely on this device.Linux & CLI
SSH / SCP Command BuilderConstruct syntactically validated, flag-optimized SCP and Rsync remote copy commands with port, key, and protocol options — entirely on this device.Linux & CLI

SQL & Databases

SQL FormatterPretty-print or minify SQL across 13 dialects with configurable style — entirely on this device.SQL & Databases
SQL to ER DiagramTurn CREATE TABLE DDL into a crow's-foot ER diagram — keys, foreign-key cardinality and SVG export, entirely on this device.SQL & Databases
Connection String BuilderBuild or parse PostgreSQL, MySQL, MongoDB, Redis, SQL Server and JDBC connection strings with correct percent-encoding — entirely on this device.SQL & Databases
SQLite Viewer / PlaygroundOpen a .sqlite file, browse tables and run real SQL in your browser — SQLite compiled to WebAssembly, nothing uploaded.SQL & Databases
SQL-on-CSV Workbench (DuckDB)Run real SQL on CSV and Parquet files in your browser with DuckDB — joins, group-bys and window functions, nothing uploaded.SQL & Databases
SQL Syntax CheckerCheck SQL syntax per dialect — unbalanced quotes, clause order and dialect slips flagged with line and column, entirely on this device.SQL & Databases
EXPLAIN Plan VisualizerPaste EXPLAIN ANALYZE output and see the plan as a tree with per-node timing, rows and hot spots — entirely on this device.SQL & Databases
DDL to ORM ModelsConvert CREATE TABLE DDL into Prisma schema, SQLAlchemy models or TypeORM entities — with a cited type mapping, entirely on this device.SQL & Databases

Text & Writing

Word / Character CounterLive word, character, sentence and byte counts with platform limit meters — entirely on this device.Text & Writing
Case ConverterConvert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case and more — every variant at once, entirely on this device.Text & Writing
Text Diff / CompareCompare two texts or files side by side or inline — line, word or character granularity — entirely on this device.Text & Writing
Remove Duplicate LinesDeduplicate any list with explicit case, trim and Unicode options — order preserved, removed lines auditable, entirely on this device.Text & Writing
Sort LinesSort any list alphabetically, naturally, numerically, by length, or shuffle it — locale-aware and stable, entirely on this device.Text & Writing
Line Break ToolsRemove, add, join or split line breaks — hard-wrapped paste to flowing text, columns to SQL IN lists — entirely on this device.Text & Writing
Remove Extra Spaces (Whitespace Tools)Trim, collapse and normalize spaces, tabs, empty lines and invisible characters — entirely on this device.Text & Writing
Text ReverserReverse any text by characters, words, each line, or line order — grapheme-safe, entirely on this device.Text & Writing
Upside Down TextFlip your text upside down or mirror it into copy-paste Unicode for social bios — entirely on this device.Text & Writing
Slug GeneratorTurn any title into a clean URL slug — language-aware diacritics folding, batch mode with CSV — entirely on this device.Text & Writing
Remove Accents & PunctuationStrip diacritics and punctuation from any text — independent toggles, base letters kept — entirely on this device.Text & Writing
Word Frequency AnalyzerRank how often each word appears — case-folding, stopword and top-N filters, CSV export — entirely on this device.Text & Writing
Email / URL / Phone ExtractorPull every email, URL and phone number out of messy text — dedupe, count and copy each list, entirely on this device.Text & Writing

Fake & Mock Data

Lorem Ipsum GeneratorGenerate placeholder text by paragraphs, sentences, words, or an exact character budget — entirely on this device.Fake & Mock Data
Themed Ipsum GeneratorGenerate themed placeholder text — hipster, corporate, tech, pirate, or bacon — by paragraphs, sentences, or words, entirely on this device.Fake & Mock Data
Fake Name GeneratorGenerate random names by locale and gender — seeded, reproducible, entirely on this device.Fake & Mock Data
Fake Address GeneratorGenerate synthetic street addresses by locale — components and a formatted block, seeded and reproducible, entirely on this device.Fake & Mock Data
Fake User Profile GeneratorGenerate a complete fake identity — name, email, avatar, address, phone, company — as a card or JSON, seeded and reproducible, entirely on this device.Fake & Mock Data
Mock Data GeneratorBuild a schema and generate realistic fake data as CSV, JSON, SQL, or XML — seeded, reproducible, entirely on this device.Fake & Mock Data
JSON Data GeneratorGenerate fake JSON from a small template of Faker tokens and repeat() — seeded, reproducible, entirely on this device.Fake & Mock Data

Markdown & Docs

Markdown Editor + PreviewWrite Markdown beside a sanitized live preview with scroll that stays in sync — entirely on this device.Markdown & Docs
Markdown to HTML ConverterConvert GitHub-flavored Markdown to clean, sanitized HTML with a faithful preview — entirely on this device.Markdown & Docs
HTML to Markdown ConverterTurn HTML into GitHub-flavoured Markdown — headings, nested lists, code fences and pipe tables — with everything Markdown cannot say named and counted.Markdown & Docs
Markdown Table GeneratorBuild a GFM table in a visual grid — paste straight from Excel or Google Sheets — entirely on this device.Markdown & Docs
Markdown TOC GeneratorTurn your headings into a Markdown table of contents — GitHub and GitLab anchor styles side by side, entirely on this device.Markdown & Docs
README GeneratorPick the sections a project README needs, order them with the keyboard, and copy the Markdown — entirely on this device.Markdown & Docs
GitHub Badge GeneratorDesign a badge, watch it render here as SVG, and copy the shields.io URL or the ready-to-paste Markdown — nothing is fetched from this page.Markdown & Docs
GitHub Profile README GeneratorBuild the README for your username/username repo — sections, badges and stats-card links — previewed entirely on this device.Markdown & Docs
Mermaid Diagram PreviewType Mermaid diagram text, or paste a whole Markdown file and step through its mermaid fences — the renderer loads only when you ask it to.Markdown & Docs

Unicode & Characters

String / Unicode InspectorBreak any string into per-character code points, categories, byte lengths and escapes — entirely on this device.Unicode & Characters
Unicode Character LookupPaste a character, type U+2014 or search by name, and get its Unicode name, block, script, category and every escape spelling — all on this device.Unicode & Characters
Zalgo Text GeneratorTurn any text into zalgo — cursed, glitchy Unicode — by stacking combining marks, with up/mid/down intensity and a reproducible seed, entirely on this device.Unicode & Characters
Fancy Text GeneratorTurn text into bold, italic, script, circled and fullwidth Unicode styles for social bios and usernames — every style at once, entirely on this device.Unicode & Characters
Emoji PickerEvery Emoji 17.0 character, searchable by name, tag or shortcode — click to copy the emoji, its shortcode or its code points, entirely on this device.Unicode & Characters
Invisible Character DetectorReveal and strip zero-width, bidi and other hidden characters — code point, name and position for every hit, entirely on this device.Unicode & Characters
ASCII Table ReferenceEvery ASCII code 0–127 with its decimal, hex, octal and binary value, glyph and control-code name — searchable instantly, entirely on this device.Unicode & Characters
ASCII Art GeneratorTurn text into big ASCII-art banners with built-in monospace fonts — entirely on this device.Unicode & Characters

Numbers & Units

Number Base ConverterConvert between binary, octal, decimal, hex and any base 2–36 — exact at any size, entirely on this device.Numbers & Units
Roman Numeral ConverterConvert Roman numerals to numbers and back — 1 to 3,999 in standard form, entirely on this device.Numbers & Units
Data Size ConverterConvert MB, GB and TB across SI (1000) and binary IEC (1024) units — exact to the last digit, entirely on this device.Numbers & Units
Download Time CalculatorEnter a file size and a transfer rate — Mbps or MB/s — and get the download time with the bits-vs-bytes math shown, entirely on this device.Numbers & Units
IEEE-754 Float InspectorSee any float's sign, exponent and mantissa bits and its exact decimal value — 32-bit or 64-bit, entirely on this device.Numbers & Units
Bitwise CalculatorRun AND, OR, XOR, NOT and shifts on integers in any base at 8-64 bit width — entirely on this device.Numbers & Units
Percentage CalculatorPercent of a number, what percent one value is of another, percent change, and adding or subtracting a percentage — worked exactly on this device.Numbers & Units

QR & Barcodes

QR Code GeneratorTurn any link or text into a permanent, static QR code — crisp SVG or high-resolution PNG, no signup, no expiry, entirely on this device.QR & Barcodes
WiFi QR Code GeneratorType your network name and password and get a printable WiFi QR code guests can scan to join — generated entirely on this device.QR & Barcodes
vCard QR Code GeneratorTurn contact details into a QR code that saves straight to the address book — vCard 3.0, generated entirely on this device.QR & Barcodes
SMS QR Code GeneratorCreate a QR code that opens a prefilled text message — number and body set by you, generated entirely on this device.QR & Barcodes
Email QR Code GeneratorCreate a QR code that opens a prefilled email — address, subject and body set by you, generated entirely on this device.QR & Barcodes
Location QR Code GeneratorTurn coordinates into a QR code that opens the point in any map app — geo: URI, generated entirely on this device.QR & Barcodes
Event QR Code GeneratorCreate a QR code that adds an event to the calendar — title, time and place in a standard VEVENT, generated on this device.QR & Barcodes
QR Code ReaderDrop a photo or point your camera and read any QR code — decoded on this device with open-source ZXing, never uploaded.QR & Barcodes
Barcode GeneratorPick a symbology, type your data and download a print-ready barcode — check digits computed and validated on this device.QR & Barcodes
Bulk QR GeneratorUpload a CSV and download a ZIP of QR codes — one per row, named by your chosen column, generated entirely in your browser.QR & Barcodes
QR DesignerEmbed your logo in a QR code with custom colors — error-correction and contrast guardrails keep it scannable, all on this device.QR & Barcodes

Miscellaneous

Phone Number FormatterPaste a number, pick a region, and read every canonical form plus number type and an honest valid-or-possible verdict — parsed entirely on this device.Miscellaneous

Infrastructure & Cloud

HCL / Terraform Converter + FormatterConvert HCL to JSON and format Terraform files with the real HashiCorp HCL library — compiled to WebAssembly, running locally.Infrastructure & Cloud
AWS IAM Policy GeneratorCompose an IAM policy statement by statement — actions, resources and conditions — with the JSON structure checked as you build.Infrastructure & Cloud
IAM Policy Explainer / LinterPaste an IAM policy and read it in plain English — statement by statement — with wildcard and risk findings, each one cited.Infrastructure & Cloud
AWS S3 Bucket Policy GeneratorGenerate secure AWS S3 bucket policies for HTTPS enforcement, CloudFront OAC, and IP whitelisting — entirely on this device.Infrastructure & Cloud
AWS S3 CORS Configuration GeneratorGenerate AWS S3 CORS configurations in JSON and XML for web apps, SPAs, and cross-origin uploads — entirely in your browser.Infrastructure & Cloud
Terraform Backend Block GeneratorGenerate secure remote state backend blocks for AWS S3, GCS, Azure, and HCP Terraform with locking and encryption.Infrastructure & Cloud
Terraform Version Constraint HelperEvaluate Terraform pessimistic (~>) operators, test candidate versions, and build required_providers blocks.Infrastructure & Cloud
Terraform tfvars GeneratorParse variables.tf declarations and scaffold clean terraform.tfvars or JSON files with comments and default values.Infrastructure & Cloud

Realtime WS & SSE

WebSocket TesterCompose frames, script replies and step a WebSocket session on this device — with the handshake key computed and every close code decoded.Realtime WS & SSE
Socket.IO TesterDecode any Socket.IO wire packet into type, namespace, ack id and args — or build one from an event form — right on this device.Realtime WS & SSE
SSE / EventSource TesterPaste a raw text/event-stream transcript and see every event parsed by the spec grammar — then replay it with real timing, all on this device.Realtime WS & SSE

APIs & Protocols

OpenAPI Validator & ViewerLint a Swagger 2.0 or OpenAPI 3.x spec against spec-cited rules and browse it as docs — findings jump to the exact line, entirely on this device.APIs & Protocols
Swagger 2 to OpenAPI 3 ConverterUpgrade a Swagger 2.0 spec to OpenAPI 3.0 with every mapping shown — servers, requestBody, components — without the spec leaving this device.APIs & Protocols
OpenAPI Mock Response GeneratorTurn the schemas in your OpenAPI spec into realistic example payloads — seeded, deterministic and format-aware — without hosting anything.APIs & Protocols
OpenAPI to Client SnippetsPick any operation in your OpenAPI spec and get a ready request snippet — fetch, axios, curl or Python requests — parameters and auth placeholders included.APIs & Protocols
GraphQL FormatterFormat or minify GraphQL queries and SDL with a canonical printer — errors pinned to line and column, entirely on this device.APIs & Protocols
GraphQL Schema VisualizerSee your GraphQL schema as an interactive type graph — fields, relations and reachability from Query — from pasted SDL or introspection JSON.APIs & Protocols
GraphQL to TypeScriptGenerate TypeScript types from GraphQL SDL — objects, inputs, enums, unions and operation result types — with nullability mapped exactly.APIs & Protocols
gRPC Status Codes ReferenceAll 17 gRPC status codes with meaning, retry guidance, common causes and per-language constants — searchable instantly on this device.APIs & Protocols
Webhook Signature VerifierRecompute a Stripe, GitHub or Slack webhook signature from the raw payload and your secret — and see exactly why it does or does not match.APIs & Protocols

NoSQL

SQL to MongoDB ConverterTranslate SQL SELECT statements into MongoDB find() or aggregation pipelines for mongosh — entirely on this device.NoSQL
Mongo Query FormatterFormat MongoDB shell queries with ISODate, ObjectId and NumberLong kept intact — where plain JSON formatters choke, entirely on this device.NoSQL
Redis Command ReferenceSearch every Redis 7.2 command with syntax, complexity and since-version, and build common commands for redis-cli — entirely on this device.NoSQL
DynamoDB JSON ConverterConvert DynamoDB marshalled JSON to plain JSON and back — S, N, B, M, L and set types handled with number precision preserved, on this device.NoSQL

Images & Media

Image Resizer / CropperResize, crop, rotate and flip any image to exact pixels or social presets — processed on this device, never uploaded.Images & Media
EXIF Viewer / StripperSee every EXIF tag in a photo — including GPS — and strip metadata losslessly. Photos are read on this device, never uploaded.Images & Media
OG Image GeneratorType a title, pick a template and export a pixel-exact 1200×630 Open Graph image — rendered entirely in your browser.Images & Media
Screenshot BeautifierDrop a screenshot, add a window frame, gradient background and shadow, and export a share-ready PNG — all on this device.Images & Media
Code Screenshot GeneratorPaste code, pick a theme and window style, and export a crisp PNG or SVG — highlighted and rendered entirely on this device.Images & Media

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Developer tools that run in your browser

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JSON Formatter

JWT Decoder

Regex Tester (JavaScript)

Base64 Decoder

UUID v4 Generator

SQL Formatter

URL Encoder/Decoder

Multi-hash Generator

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