How does the CSS minifier reduce file size?

It removes comments, extra whitespace and line breaks, and the spaces around braces, colons, semicolons and commas, plus needless trailing semicolons. The styling stays identical while the byte count drops.

Will minifying change how my CSS works?

No. The tool only removes characters that browsers ignore (whitespace and comments). Your selectors, properties and values are untouched, so the rendered result is exactly the same.

Is my CSS uploaded anywhere when I minify it?

No. Minification runs entirely in your browser on your own device. Your code is never sent to a server, which keeps client work and private projects safe.

Can I get my original CSS back after minifying?

Not from the minified output, since comments and formatting are gone for good. Always keep your readable source file and use the minified version only for production.

CSS Minifier | JotTools

Input

Output

What the CSS Minifier does

This tool strips the dead weight out of your stylesheet. Paste in your CSS and it removes comments, collapses runs of whitespace and line breaks, deletes spaces around braces, colons, semicolons and commas, and drops unnecessary trailing semicolons. What you get back is the exact same styling in far fewer bytes. It is handy for front-end developers, students learning CSS, and anyone shipping a site who wants a lighter file without setting up a build step.

How to use it

Paste or type your CSS into the input box on the left.
Click the Minify button.
The compressed CSS appears in the Output box on the right.
Hit Copy to grab the result and drop it into your .css file or <style> tag.

There are no settings to fiddle with. Paste, click, copy, done.

Why minify here

Smaller CSS means fewer bytes for browsers to download, so pages paint sooner and your styles load faster, especially on mobile connections. Doing it in the browser keeps things quick and private: your code is processed on your own device and never gets uploaded to a server, which matters when the CSS belongs to a client or an unreleased project. It is free, needs no account, and works on any device with a browser.

Keep your original, readable stylesheet for editing and use the minified version only in production. If you also need to shrink HTML or JavaScript, JotTools has matching minifiers for those.

Tip: minified CSS is hard to edit by hand, so always keep an unminified copy as your working source. For squeezing many stylesheets or assets at once, the BulkPro desktop app from the same team handles batch jobs.

Frequently asked questions

How does the CSS minifier reduce file size?: It removes comments, extra whitespace and line breaks, and the spaces around braces, colons, semicolons and commas, plus needless trailing semicolons. The styling stays identical while the byte count drops.
Will minifying change how my CSS works?: No. The tool only removes characters that browsers ignore (whitespace and comments). Your selectors, properties and values are untouched, so the rendered result is exactly the same.
Is my CSS uploaded anywhere when I minify it?: No. Minification runs entirely in your browser on your own device. Your code is never sent to a server, which keeps client work and private projects safe.
Can I get my original CSS back after minifying?: Not from the minified output, since comments and formatting are gone for good. Always keep your readable source file and use the minified version only for production.

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Last updated: June 15, 2026