Is this a full AST-based minifier?

No. This is a fast, lightweight minifier that handles the most common cases: removing comments, collapsing whitespace, and stripping empty lines. For production JavaScript, consider tools like Terser or esbuild that perform full AST-based minification with dead-code elimination.

Will it break my JavaScript?

The JS minifier strips comments and collapses whitespace only — it does not rename variables, remove semicolons, or apply unsafe transformations. Code that relies on ASI (automatic semicolon insertion) edge cases should be tested after minification.

What HTML comments are removed?

Standard HTML comments ( ) are removed. Conditional comments ( ) are preserved as they may be functionally significant.

Can I minify inline CSS and JS inside HTML?

Use the CSS or JS tab to minify those blocks separately, then paste the results back into your HTML. Full in-HTML minification of embedded scripts and styles is not supported in this lightweight tool.

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HTML / CSS / JS Minifier

Minify HTML, CSS, and JavaScript to reduce file size — runs entirely in your browser.

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About this tool

Reduce the size of your HTML, CSS, and JavaScript files for faster page loads. Switch between three tabs, paste your code, and see the minified output instantly along with the original size, minified size, and percentage reduction. HTML minification strips comments and collapses whitespace; CSS removes comments and whitespace; JS strips line and block comments and collapses whitespace.

How to use

1 Select the HTML, CSS, or JS tab.
2 Paste your source code into the input.
3 The minified output and size reduction appear automatically.
4 Click 'Copy Output' to copy the minified code.

Frequently Asked Questions

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