Free Code Beautifier — Format HTML, CSS, JavaScript & JSON

Messy, minified, or poorly indented code is hard to read, debug, and maintain. Our Code Beautifier instantly transforms compressed, unformatted code into clean, properly indented, human-readable code. Powered by the industry-standard js-beautify library, trusted by millions of developers worldwide.

Supports HTML, CSS, JavaScript, and JSON — the four languages that make up the modern web. All processing happens in your browser — no code is ever sent to any server.

Why Use a Code Beautifier?

Read and understand minified third-party code
Debug formatting issues in HTML templates
Clean up auto-generated or copy-pasted CSS
Make JSON responses readable for inspection
Prepare code for code reviews and documentation

Last Updated: April 2026

Frequently Asked Questions

No. Beautifying only changes whitespace — indentation, line breaks, and spacing. It does not alter the logic, structure, or functionality of your code. The output is semantically identical to the input.

Beautifying adds whitespace, indentation, and line breaks to make code human-readable. Minifying does the opposite — it removes all unnecessary whitespace to reduce file size for production. Beautifying is for development; minifying is for deployment.

Yes. JSON formatting is built in. JSON beautifier will add proper indentation and line breaks to compressed JSON, making nested structures easy to read. Invalid JSON will trigger an error message.

There is no hard file size limit since processing happens entirely in your browser. However, very large files (>1MB of code) may take a moment to process depending on your device speed.