Free developer tools
The small utilities you reach for a dozen times a day — formatters, encoders, decoders, generators and testers — without installing an extension or pasting sensitive data into a random website.
Everything that can run locally does: JSON, tokens, hashes and code are processed in your browser. Network tools such as DNS or SSL lookups query public data only for the domain you enter.
Most popular developer tools
JSON Formatter
Free online JSON Formatter. Simple, fast, and secure tool running in your browser.
Base64 Encoder
Free online Base64 Encoder. Simple, fast, and secure tool running in your browser.
Regex Tester
Free online Regex Tester. Simple, fast, and secure tool running in your browser.
UUID Generator
Free online UUID Generator. Simple, fast, and secure tool running in your browser.
JWT Decoder
Free online JWT Decoder. Simple, fast, and secure tool running in your browser.
Unix Timestamp Converter
Free online Unix Timestamp Converter. Simple, fast, and secure tool running in your browser.
All 41 developer tools
JSON Formatter
Free online JSON Formatter. Simple, fast, and secure tool running in your browser.
JSON Validator
Free online JSON Validator. Simple, fast, and secure tool running in your browser.
XML Formatter
Free online XML Formatter. Simple, fast, and secure tool running in your browser.
HTML Formatter
Free online HTML Formatter. Simple, fast, and secure tool running in your browser.
CSS Formatter
Free online CSS Formatter. Simple, fast, and secure tool running in your browser.
SQL Formatter
Free online SQL Formatter. Simple, fast, and secure tool running in your browser.
JavaScript Beautifier
Free online JavaScript Beautifier. Simple, fast, and secure tool running in your browser.
HTML Minifier
Free online HTML Minifier. Simple, fast, and secure tool running in your browser.
CSS Minifier
Free online CSS Minifier. Simple, fast, and secure tool running in your browser.
JS Minifier
Free online JS Minifier. Simple, fast, and secure tool running in your browser.
Base64 Encoder
Free online Base64 Encoder. Simple, fast, and secure tool running in your browser.
Base64 Decoder
Free online Base64 Decoder. Simple, fast, and secure tool running in your browser.
URL Encoder
Free online URL Encoder. Simple, fast, and secure tool running in your browser.
URL Decoder
Free online URL Decoder. Simple, fast, and secure tool running in your browser.
JWT Decoder
Free online JWT Decoder. Simple, fast, and secure tool running in your browser.
Markdown to HTML
Free online Markdown to HTML. Simple, fast, and secure tool running in your browser.
HTML to Markdown
Free online HTML to Markdown. Simple, fast, and secure tool running in your browser.
Color Code Converter
Free online Color Code Converter. Simple, fast, and secure tool running in your browser.
RGB to HEX
Free online RGB to HEX. Simple, fast, and secure tool running in your browser.
HEX to RGB
Free online HEX to RGB. Simple, fast, and secure tool running in your browser.
Regex Tester
Free online Regex Tester. Simple, fast, and secure tool running in your browser.
Cron Expression Generator
Free online Cron Expression Generator. Simple, fast, and secure tool running in your browser.
API Response Formatter
Free online API Response Formatter. Simple, fast, and secure tool running in your browser.
UUID Generator
Free online UUID Generator. Simple, fast, and secure tool running in your browser.
Random Number Generator
Free online Random Number Generator. Simple, fast, and secure tool running in your browser.
Random String Generator
Free online Random String Generator. Simple, fast, and secure tool running in your browser.
Password Hash Generator
Free online Password Hash Generator. Simple, fast, and secure tool running in your browser.
SHA256 Generator
Free online SHA256 Generator. Simple, fast, and secure tool running in your browser.
MD5 Hash Generator
Free online MD5 Hash Generator. Simple, fast, and secure tool running in your browser.
Unix Timestamp Converter
Free online Unix Timestamp Converter. Simple, fast, and secure tool running in your browser.
DNS Lookup Tool
Free online DNS Lookup Tool. Simple, fast, and secure tool running in your browser.
IP Lookup Tool
Free online IP Lookup Tool. Simple, fast, and secure tool running in your browser.
User Agent Parser
Free online User Agent Parser. Simple, fast, and secure tool running in your browser.
HTTP Header Checker
Free online HTTP Header Checker. Simple, fast, and secure tool running in your browser.
SSL Checker
Free online SSL Checker. Simple, fast, and secure tool running in your browser.
URL Parser
Free online URL Parser. Simple, fast, and secure tool running in your browser.
HTML Entity Encoder
Free online HTML Entity Encoder. Simple, fast, and secure tool running in your browser.
HTML Entity Decoder
Free online HTML Entity Decoder. Simple, fast, and secure tool running in your browser.
CSS Gradient Generator
Free online CSS Gradient Generator. Simple, fast, and secure tool running in your browser.
JSON to CSV Converter
Free online JSON to CSV Converter. Simple, fast, and secure tool running in your browser.
API Tester
Free online API Tester. Send HTTP requests (GET, POST, PUT, DELETE) and inspect responses directly in your browser.
Find the right developer tool
- Data formats
- Pretty-print or validate with the JSON Formatter and JSON Validator, convert with JSON to CSV, and tidy XML or SQL.
- Encoding
- Base64 encode or decode, URL-encode query strings, and escape HTML entities.
- Debugging
- Test patterns with the Regex Tester, inspect tokens with the JWT Decoder, and convert Unix timestamps.
- Generators
- Create UUIDs, SHA-256 and MD5 hashes, cron expressions and CSS gradients.
- Front-end
- Minify CSS, JavaScript and HTML, or convert colours between HEX and RGB.