CSS / JS Minifier

Minify CSS or JavaScript to reduce file size for production.

A safe, lightweight minifier: removes comments and unnecessary whitespace. For JavaScript it preserves strings and avoids risky transformations, so it won't mangle your code — it just trims it.

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How to use CSS / JS Minifier

Three quick steps — no sign-up needed

  1. Step 1

    Choose CSS or JavaScript

    Select the language so minification rules match the syntax.

  2. Step 2

    Paste your code

    Drop in the stylesheet or script you want compressed.

  3. Step 3

    Copy the minified output

    Use the smaller result in production builds after testing.

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About CSS / JS Minifier

CSS / JS Minifier shrinks stylesheets and scripts by removing unnecessary whitespace and comments so pages transfer fewer bytes. Front-end developers searching "minify CSS online" or "JavaScript minifier" need a quick pass before deploy when a full bundler is not open.

Select CSS or JavaScript, paste source, and copy the minified output. Always test after minifying - aggressive tools can break rare syntax or rely on ASI edge cases in JS.

Modern apps often minify via Vite, webpack, or esbuild in CI. This page is ideal for small snippets, email CSS, or emergency fixes - not a replacement for a full production pipeline with source maps.

Keep original sources in version control; deploy minified artefacts, not your only copy.

Benefits of CSS / JS Minifier

CSS and JS modes One tool for both asset types.
Smaller payloads Less whitespace means faster transfers on slow networks.
Snippet friendly Useful when a full build toolchain is overkill.
Copy-ready output Paste straight into files or CMS fields.

Frequently asked questions

Will minifying break my code?

Usually safe, but always test. Unusual JS relying on certain line breaks can fail.

Does it uglify/mangle names?

This tool focuses on minification size reduction; full mangling may need a dedicated bundler.

Should I minify in development?

Keep readable sources for debugging; minify for production.

Is CSS nesting supported?

Depends on the minifier implementation - validate output in your target browsers.

Is source sent to a server?

Prefer local processing for proprietary code; check privacy notes if unsure.