Developer Tools
32 free developer tools, fast, private and no sign-up required. Pick a tool below and get straight to work.
JSON Formatter & Validator
Format, minify and validate JSON with clear errors
QR Code Generator
Create QR codes for URLs, text and contact info
TTFB Checker
Measure honest time-to-first-byte with 3 real runs and a median grade
Server Response Time Checker
Full timing breakdown: DNS, TCP, TLS and server processing in milliseconds
GZIP/Brotli Compression Checker
Verify real GZIP or Brotli compression and see the exact bytes saved
HTTP/2 Checker
Detect HTTP/2 support on any website (coming soon)
HTTP/3 Checker
Detect HTTP/3 and QUIC support on any website (coming soon)
Port Checker
Check open TCP ports on a host (coming soon)
WiFi QR Code Generator
Let guests join your WiFi by scanning a QR code, no typing needed
Base64 Encode/Decode
Encode text to Base64 or decode it back, with proper UTF-8 handling
HTML Minifier
Shrink HTML safely: comments and whitespace out, content untouched
CSS Minifier
Shrink stylesheets safely with string-aware comment stripping
JavaScript Minifier
Real Terser-powered JS minification: parse, compress, mangle
UUID Generator
Bulk-generate cryptographically random version 4 UUIDs
URL Encoder/Decoder
Encode or decode URLs and query strings instantly
HTML Entity Encoder/Decoder
Convert special characters to HTML entities and back
Regex Tester
Test regular expressions with live matches and groups
Unix Timestamp Converter
Convert epoch timestamps to dates and dates to timestamps
JWT Decoder
Decode JSON Web Tokens and inspect their claims
YAML to JSON Converter
Convert YAML config and data to clean JSON
XML Formatter
Pretty-print, validate and minify XML in seconds
CSV to JSON Converter
Turn CSV spreadsheets into JSON arrays instantly
JSON to CSV Converter
Convert JSON arrays into spreadsheet-ready CSV
Cron Expression Generator
Build cron schedules visually and see the next runs
User Agent Parser
Break any user agent string into browser, OS and device
MIME Type Lookup
Find the MIME type for any file extension, and back
SQL Formatter
Format and beautify SQL queries for any database
Text Diff Checker
Compare two texts and see every change line by line
CSS Cheat Sheet
Everyday CSS selectors, flexbox, grid, and layout patterns with copy-ready snippets
JavaScript Cheat Sheet
Arrays, DOM, fetch, async, and ES6 patterns with copy-ready snippets
Regex Cheat Sheet
Regular expression syntax, character classes, and ready-made patterns with plain-English explanations
HTML Cheat Sheet
Document structure, forms, tables, semantic tags, and meta tags with copy-ready snippets