Free Code Tools • Works Offline

Format & Validate Code
In Milliseconds

Format JSON, minify HTML, CSS and JavaScript, test regular expressions, and compare code differences. Everything runs in your browser so you can work offline and keep sensitive code private.

9 tools
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Free Code Tools for Developers, No Install Needed

These code tools handle the daily tasks developers deal with all the time. Paste messy JSON from an API response and format it into something readable in seconds. Minify your HTML, CSS, or JavaScript before pushing to production. Test a regular expression against real input without switching apps. Compare two versions of a file to see exactly what changed. Everything runs in your browser, which means no pasting sensitive code into third-party servers. Fast, private, and always available.

All tools run entirely in your browser. No files are uploaded to our server.

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Frequently Asked Questions

Everything you need to know

Our code tools support JSON, HTML, CSS, JavaScript, XML, and SQL. You can format, minify, validate, and compare code across all these languages.

No. All code formatting, minification, and validation happens locally in your browser using JavaScript. Your code never leaves your device.

Yes. Once the tool page loads, all processing is done client-side using JavaScript. The tools work even if your internet connection drops mid-session.

Paste your CSS or JavaScript into our minifier tool. It removes whitespace, comments, and shortens variable names where possible, giving you production-ready minified code in seconds.

The JSON formatter takes raw or minified JSON and formats it with proper indentation, line breaks, and syntax highlighting. It also validates the JSON and highlights any syntax errors with line numbers.

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