12 Free Online Developer Tools You Will Use Every Day
💻Every developer keeps a handful of small utilities within arm's reach. Here are the ones worth bookmarking — all free, all running right in your browser.
Data & formatting
- JSON Formatter — beautify, validate and minify JSON instantly.
- Base64 Encoder — encode/decode strings and data URIs.
- URL Encoder — safely escape query parameters.
- HTML Encoder — convert characters to entities.
Debugging & testing
- Regex Tester — build and debug patterns with live matching.
- JWT Decoder — inspect token headers and payloads.
- Text Diff — spot changes between two blocks of text.
- Timestamp Converter — translate Unix time to readable dates.
Generators & helpers
- UUID Generator — create v4 UUIDs in bulk.
- Hash Generator — SHA-1, SHA-256 and SHA-512.
- Color Picker — convert between HEX, RGB and HSL.
- CSS Minifier — shrink stylesheets for production.
Why browser-based?
No installs, no accounts, and because everything runs client-side, your code and data never touch a server. See the full set on the Developer Tools page.