Every developer needs a set of go-to online tools. Here are 10 free ones that do not require signup and process everything in your browser.
JSON & Data
- JSON Formatter - Format, validate, and prettify messy JSON
- Base64 Encoder/Decoder - Quick encode/decode without CLI
Generators
- UUID Generator - Generate v4 UUIDs instantly
- QR Code Generator - Create QR codes from URLs or text
- Password Generator - Strong random passwords
CSS & JS
- CSS Minifier - Minify CSS for production
- JS Minifier - Minify JavaScript in one click
Utilities
- Color Picker - Pick, convert, and copy colors
- Markdown Preview - Live MD rendering
- URL Encoder - URL encode/decode
- Hash Generator - MD5, SHA-1, SHA-256
- Word Counter - Count words, characters, lines
All tools are privacy-first. Your data stays in your browser — nothing is uploaded to any server.
Bookmark DevToolbox for your daily toolkit.
What online dev tools do you use daily?
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