Free Online Developer Tools

Fast, simple tools for developers. Format, convert, and generate code instantly. All tools run directly in your browser - no backend, no tracking.

Why Choose TonuTools?

Built with modern web technologies to provide the best developer experience

All tools run directly in your browser with instant results

Your data never leaves your browser. No server processing

Built by developers for developers with clean interfaces

Start using tools immediately without any registration

Most used tools by developers worldwide. All free, all instant.

Format and validate JSON data with syntax highlighting

Compress CSS code to reduce file size

Format and beautify HTML code with proper structure

Encode and decode Base64 strings instantly

Convert Unix timestamps to readable dates

Generate unique identifiers for your applications

Test and debug regular expressions with live results

Convert between HEX, RGB, HSL color formats

No registration, no installation. Just open and start using the tools you need.