Developer Tools
Format, validate, and decode data in seconds: test regex, JWTs, and APIs without leaving your browser.
JSON Formatter
Format, validate, minify, and prettify JSON data instantly.
>JWT Decoder
Decode and inspect JWT tokens: header, payload, signature, expiration.
>Base64 Encoder/Decoder
Encode text or files to Base64 and decode back. UTF-8 safe.
>Regex Tester
Test regular expressions in real-time with match highlighting and groups.
>UUID Generator
Generate UUIDs and ULIDs: v4, v7, bulk mode, copy, download.
>Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
>Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes for text and files.
>SQL Formatter
Format and beautify SQL queries for PostgreSQL, MySQL, SQLite.
>Cron Expression Generator
Build and test cron expressions with next-run previews.
>Password Generator
Generate strong, secure passwords with customizable character sets and entropy.
>.gitignore Generator
Generate .gitignore files with 500+ templates for any tech stack.
>Diff Checker
Compare text and code side by side with line-level highlighting.
>URL Encoder/Decoder
Encode and decode URLs, query strings, and components. Parse URLs into parts.
>API Tester
Send HTTP requests, inspect responses, and generate curl commands.
>HTML Entities Encoder/Decoder
Encode and decode HTML entities with a character reference cheat sheet.
>JS Minifier/Beautifier
Minify and beautify JavaScript with comment stripping and gzip sizing.
>CSS Minifier/Beautifier
Minify and beautify CSS with comment stripping and gzip sizing.
>HTML Formatter/Validator
Format, minify, validate, and visualize HTML as a DOM tree.
>XML Formatter/Validator
Format, minify, validate, and visualize XML documents as a tree.
>Text Case Converter
Convert text between lowercase, UPPERCASE, Title Case, camelCase, snake_case, and more.
>Viewport Tester
Preview layouts at any screen size with device presets and media query snippets.
>Code Screenshot
Turn code into shareable PNG screenshots with themes, line numbers, and chrome.
>SVG Optimizer
Minify and clean SVG files with svgo in your browser: no upload needed.
>PEM Certificate Inspector
Decode PEM certificates: subject, issuer, SANs, key details, fingerprints.
>HAR Analyzer
Upload a .har file and analyze every request: timings, waterfall, payloads.
>Dockerfile Linter
Lint Dockerfiles for best practices: layers, caching, security, size.
>Docker Compose Validator
Validate docker-compose.yml: syntax, services, ports, volumes, networks.
>.env File Validator
Lint .env files: syntax, duplicates, secrets, and clean exports.
>Password Strength Checker
Score passwords with zxcvbn and check for known breaches via HIBP.
>CSP Header Builder
Build Content-Security-Policy headers with guided directive and source selection.
>npm Package Size
Check bundle sizes of npm packages: minified + gzip, compare two packages.
>Meta Tag Preview
Preview how your page looks on Google, Facebook, X and LinkedIn.
>DNS Lookup
Look up A, AAAA, CNAME, MX, NS, TXT, SOA, PTR, and CAA records via DNS-over-HTTPS.
>HTTP Status Checker
Check the HTTP status of any URL, follow redirect chains, and inspect headers.
>TOML Validator
Validate TOML configuration files against the TOML 1.0 spec and convert to JSON.
>Git Diff Viewer
Paste a git diff and read it visually: hunks, line numbers, additions, deletions.
>Open Source License Picker
Pick the right license for your project with a goals-based decision wizard.
>First PR Checklist
Track your first open source contribution step by step: saved in your browser.
>GitHub Project Finder
Discover active open source projects to contribute to: search by language, stars, license, and recent activity: live from GitHub.
>GitHub Profile Analyzer
Analyze your GitHub profile and get an industry-grade score with exact, prioritized fixes and copy-paste templates.