CSS / JS / HTML Minifier
Paste your CSS, JavaScript or HTML to instantly minify and reduce file size. Runs entirely in your browser.
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What is a CSS / JS / HTML Minifier?
A minifier removes whitespace, comments, and unnecessary characters from CSS, JavaScript, and HTML files to produce smaller files that download and parse faster. Minifying your assets is one of the quickest wins for web performance and Lighthouse scores.
How to use this minifier
- Select the language (CSS, JavaScript, or HTML) from the dropdown.
- Paste your source code into the Input box.
- The minified output appears instantly in the Output panel.
- Click Copy or Save to use the result.
Frequently Asked Questions
Will minifying break my code?
No. Minification only strips whitespace and comments — it doesn't change logic. Always keep your original source files separate from the minified output.
How much file size reduction can I expect?
Typically 20–50% for CSS and HTML, and 30–60% for JavaScript depending on how heavily commented and spaced the source is. Combined with gzip compression on your server, savings are even greater.
Is this tool free?
Completely free. No signup, no limits, and your code never leaves your browser.
Should I minify in production?
Yes. Minifying CSS and JS is a standard production build step. Tools like webpack, Vite, and esbuild do this automatically. Use this tool for quick one-off minification without a build pipeline.