PopularHot
JSON Formatter
JSON Formatter for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
Developer Tools
Free developer tools to format and validate JSON, HTML, CSS and SQL, minify code, encode and decode Base64 and URLs, test regex, generate UUIDs and hashes, and convert timestamps.
Popular
JSON Validator
JSON Validator for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
JSON Minifier
JSON Minifier online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
HTML Formatter
HTML Formatter for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
Trending
CSS Minifier
Fast, free CSS Minifier that runs entirely client-side in your browser.
DeveloperOpen Tool
JavaScript Minifier
JavaScript Minifier online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
CSS Formatter
CSS Formatter online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
Popular
Base64 Encoder
Base64 Encoder for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
Base64 Decoder
Base64 Decoder online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
URL Encoder
URL Encoder online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
URL Decoder
URL Decoder online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
Trending
Regex Tester
Regex Tester online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
Popular
Hash Generator
Fast, free Hash Generator that runs entirely client-side in your browser.
DeveloperOpen Tool
Popular
UUID Generator
Fast, free UUID Generator that runs entirely client-side in your browser.
DeveloperOpen Tool
Timestamp Converter
Timestamp Converter online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
SQL Formatter
SQL Formatter online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
HTML Encoder
Fast, free HTML Encoder that runs entirely client-side in your browser.
DeveloperOpen Tool
HTML Decoder
HTML Decoder online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
Trending
JWT Decoder
JWT Decoder online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
Color Code Converter
Fast, free Color Code Converter that runs entirely client-side in your browser.
DeveloperOpen Tool
Cron Expression Helper
Cron Expression Helper for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
JSON to TypeScript
Fast, free JSON to TypeScript that runs entirely client-side in your browser.
DeveloperOpen Tool
HTML to JSX Converter
HTML to JSX Converter for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
String Escaper
String Escaper for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
Number Base Converter
Number Base Converter for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
Text Hash Checker
Text Hash Checker for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
XML Formatter
XML Formatter for developers — instant, offline-style and privacy-safe.
DeveloperOpen Tool
YAML Validator
YAML Validator online: paste, process and copy without your data hitting a server.
DeveloperOpen Tool
No tools match your filter.
About our Developer Tools
The everyday utilities developers reach for, with none of the clutter. Format and validate JSON, beautify or minify HTML/CSS/JS, test regular expressions live, encode and decode Base64 and URLs, hash strings, generate UUIDs and convert Unix timestamps. Each tool runs instantly client-side, so you can paste API keys, tokens or proprietary payloads without them ever touching a server.
Every tool in this collection is free, requires no sign-up, and processes your data entirely in your browser. That means there are no uploads, no waiting, and no privacy trade-offs — ideal whether you are on a fast desktop connection or a phone with patchy signal. Browse the 28 developer tools above, or use the search to jump straight to the one you need.