Developer & Web Tools
Code formatters, validators, and development utilities.
Essential developer utilities — JSON formatter, regex tester, Base64 encoder, JWT debugger, CSS generators, cron builder, and more.
API Request Builder
Build and send HTTP requests with custom headers, body and auth.
Base64 Encoder / Decoder
Encode plain text or files to Base64 and decode them back.
Chmod Calculator
Calculate Unix file permission modes visually.
Code Minifier & Beautifier
Minify or prettify HTML, CSS and JavaScript code.
Color Contrast Checker
Check foreground/background color contrast for WCAG AA/AAA compliance.
Color Palette Generator
Generate harmonious color palettes from a base color.
Cron Job Generator
Build and validate cron expressions with a visual editor.
CSS Box Shadow Generator
Design box shadows visually and copy the CSS code.
CSS Grid Generator
Build CSS Grid layouts visually and export clean code.
DNS Lookup Tool
Look up DNS records (A, MX, TXT, CNAME) for any domain.
Flexbox Playground
Experiment with CSS Flexbox properties in a live visual editor.
Gradient Generator
Create CSS linear and radial gradients with a visual builder.
Hash Generator & Verifier
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes and verify them.
HTTP Status Code Reference
Searchable reference of all HTTP status codes with explanations.
JSON Formatter & Validator
Format, validate and explore JSON with syntax highlighting.
JWT Debugger
Decode, inspect and verify JSON Web Tokens - header, payload and signature.
Markdown Editor & Preview
Write Markdown in a live split-pane editor with instant preview.
Regex Tester
Test and debug regular expressions with live match highlighting.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
URL Encoder / Decoder
Encode or decode URL-encoded (percent-encoded) strings.
User Agent Checker
Detect browser, OS and device from any user-agent string.
Text Diff Checker
Compare two blocks of text line by line and see a highlighted diff.
Browser Info Checker
View detailed browser and device information: screen size, viewport, language, timezone, GPU, hardware concurrency, and more.