32 tools
Everyday developer utilities
Compare code, format structured data, test patterns, inspect tokens, encode values, and generate secure development fixtures without leaving your browser.
- Input stays in your browser
- No signup required
Essential dev tools
Fast utilities for the small transformations and checks that interrupt a development workflow.
Diff Checker
Compare text or code line by line, or normalize JSON for a semantic structural comparison.
Open toolJSON Formatter & Validator
Validate, beautify, minify, and recursively sort JSON data.
Open toolJWT Workbench
Decode tokens, inspect claims, verify HMAC signatures, and generate local development JWTs.
Open toolRegular Expression Tester
Test JavaScript regex patterns, flags, matches, offsets, and capture groups.
Open toolBase Encoding Converter
Encode and decode UTF-8 text with Base32, Base58, Base64, and Base64 URL.
Open toolIdentifier Generator
Generate and validate UUIDs, or create compact Nano ID and sortable ULID values.
Open toolAll developer tools
Inspect & Compare
Diff Checker
Compare text or code line by line, or normalize JSON for a semantic structural comparison.
Open toolRegular Expression Tester
Test JavaScript regex patterns, flags, matches, offsets, and capture groups.
Open toolURL Parser & Validator
Validate absolute URLs and inspect schemes, hosts, paths, query parameters, credentials, and fragments.
Open toolUser-Agent Parser
Identify browser, engine, operating system, device class, and CPU hints from a User-Agent string.
Open toolHTTP Header Parser
Parse pasted HTTP headers and group security, caching, content, CORS, and general fields.
Open toolJWT Workbench
Decode tokens, inspect claims, verify HMAC signatures, and generate local development JWTs.
Open toolCron Workbench
Parse and validate five-field cron expressions, choose presets, and preview upcoming occurrences.
Open toolFormat & Validate
JSON Formatter & Validator
Validate, beautify, minify, and recursively sort JSON data.
Open toolXML Formatter & Validator
Validate XML syntax and convert documents to readable or compact output.
Open toolYAML Formatter & Validator
Parse strict YAML, report syntax problems, and produce consistently indented output.
Open toolHTML Formatter
Format or compact HTML markup with a syntax-aware browser parser.
Open toolCSS Formatter
Format or compact CSS stylesheets and surface invalid syntax.
Open toolJavaScript Formatter
Format or compact JavaScript locally with syntax-aware parsing.
Open toolSQL Formatter
Format SQL queries with configurable indentation and keyword casing.
Open toolMarkdown Previewer
Render GitHub-flavored Markdown locally and inspect sanitized HTML output.
Open toolEmail Address Validator
Check email structure, length, local-part rules, and domain labels without sending a message.
Open toolEncode & Decode
Base Encoding Converter
Encode and decode UTF-8 text with Base32, Base58, Base64, and Base64 URL.
Open toolURL Encoder & Decoder
Percent-encode query values or complete URLs and decode escaped text.
Open toolHTML Entity Encoder & Decoder
Escape markup-sensitive characters or decode named and numeric HTML entities.
Open toolCharacter Encoding Converter
Convert text to and from UTF-8 hexadecimal bytes, Unicode code points, and ASCII values.
Open toolROT13 Encoder & Decoder
Apply the reversible ROT13 substitution to Latin letters while preserving other characters.
Open toolPunycode Encoder & Decoder
Convert internationalized domain labels between Unicode and ASCII-compatible Punycode.
Open toolGenerate
Identifier Generator
Generate and validate UUIDs, or create compact Nano ID and sortable ULID values.
Open toolSecure Token Generator
Create cryptographically strong random strings and prefixed API-key-shaped tokens.
Open toolRandom Number Generator
Generate secure integers or fixed-precision decimal values within a configurable range.
Open toolPassword Generator
Generate strong passwords with guaranteed character classes and secure browser randomness.
Open toolQR & Barcode Generator
Create downloadable QR codes and common one-dimensional barcode formats locally.
Open toolFake Data Generator
Create deterministic fictional JSON or CSV records for tests, fixtures, and prototypes.
Open toolHash & Security
Hash Workbench
Calculate MD5 and SHA digests, generate HMAC values, and compare hexadecimal hashes.
Open toolPassword Strength Checker
Estimate password entropy and flag short, common, or repeated patterns locally.
Open toolBcrypt Hash Generator & Checker
Create salted bcrypt password hashes or verify passwords against existing bcrypt values.
Open toolCertificate Decoder
Decode pasted X.509 certificates and inspect subjects, issuers, validity, algorithms, and thumbprints.
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