Is minification safe for production?

Yes for most cases. Our minifier only removes whitespace, comments, and unnecessary characters. It does not rename variables or change logic. Always test your minified code, especially JavaScript.

Will minification break my JavaScript?

The JavaScript minifier uses Terser with compression and mangling disabled — the safest possible mode. It strips comments and collapses whitespace without altering behaviour. For aggressive optimisation, use Terser's full mode locally.

Does it preserve pre and code blocks in HTML?

Yes. The HTML minifier preserves the exact contents of pre, textarea, script, and style tags. Only structural whitespace between tags is removed.

Is my code sent anywhere?

No. All minification runs entirely in your browser. Your code never leaves your device.

What is the difference between minification and compression?

Minification removes unnecessary characters from source code. Compression (GZIP, Brotli) reduces transfer size on the wire by encoding repeated patterns. They work together — minify first, then serve with GZIP/Brotli. Modern servers do the compression automatically.

Does minification improve SEO?

Indirectly. Smaller files load faster, and page speed is a ranking factor. Google recommends minifying HTML, CSS and JavaScript as a standard performance optimisation. The effect on rankings is small but real, especially on mobile.

Code Minifier

Compress HTML, CSS or JavaScript by removing whitespace and comments. The language is detected automatically. JavaScript uses Terser in its safest mode — no variable renaming, no logic changes. See the size reduction in bytes after minifying.

How to use

Paste your code

Drop HTML, CSS or JavaScript into the input field.

Click Minify

The minifier detects the language automatically and strips whitespace and comments.

Read the result

See the minified code and the size reduction in bytes.

Copy or download

Copy the minified code or save it as a file.

HTMLCSSJavaScript

477 B→0 B−100%

Source code

Minified

Features

HTML, CSS and JavaScript

One tool for all three — the language is detected automatically.

Safe JavaScript mode

Uses Terser with compression and mangling disabled — the safest possible mode.

Preserves pre and code blocks

HTML minifier leaves the contents of pre, textarea, script and style untouched.

Size comparison

See original and minified size side by side.

Error display

Shows clear errors if the code is malformed.

Common use cases

Minify CSS before deploying a website
Compress JavaScript for production
Reduce HTML file size for faster page loads
Check how much smaller minified code is

Frequently Asked Questions

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