Code Minifier

Minify HTML, CSS and JavaScript with size savings shown. Minify HTML, CSS and JavaScript online. Strips comments and unnecessary whitespace and shows bytes saved. Free client-side code minifier.

This interactive tool needs JavaScript enabled. All calculations run locally in your browser — nothing is ever uploaded.

This tool runs 100% in your browser. Your input is never sent to any server — you can even go offline after the page loads.

About the Code Minifier

Every kilobyte counts on slow connections, and minification — removing comments, line breaks and redundant whitespace — is the cheapest performance win available. Paste HTML, CSS or JavaScript and this tool produces a compact production build in milliseconds, reporting the size before and after and the percentage saved. It performs safe, conservative transformations: aggressive renaming is intentionally avoided so your code behaves exactly as it did.

How to use the Code Minifier

Pick the language tab matching your code.
Paste your source into the editor.
Click Minify to see the compact output.
Check the savings report and copy the result.

Key features

HTML, CSS and JavaScript modes
Removes comments and collapses whitespace safely
Before/after byte counts and percentage saved
Conservative rules — no risky transformations

Is this minifier safe for production code?

It applies conservative, well-understood rules only. For large codebases, bundlers like esbuild, Terser or CSSNano offer deeper optimisation — this tool is ideal for quick, one-off files.

Why minify at all?

Smaller files download and parse faster, which improves page speed, Core Web Vitals and indirectly your search rankings.

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