MyAITools
Minifier

CSS Minifier

CSS Minifier is a free online minifier that helps you minify CSS; strip whitespace, comments and unused syntax to ship smaller stylesheets. CSS Minifier uses 1 input field, returns 4 output values, and runs in your browser on the device.

Key facts

Inputs
1 field: CSS
Outputs
4 values: Minified CSS, Original size (chars), Minified size (chars), and Saved
Runtime
your browser on the device
Mode
Minifier
Privacy
Files and text stay in the browser session.
Cost
$0, no account required

How to use CSS Minifier

  1. 1

    Paste or fill in the input

    Enter your text or values into the input fields on the page.

  2. 2

    Run the utility

    Click Compute to run the utility in your browser and review the result.

  3. 3

    Copy the output

    Copy the output value you need from the result panel.

CSS Minifier details

First, enter CSS in CSS Minifier. Next, review Minified CSS, Original size (chars), Minified size (chars), and Saved. Additionally, CSS Minifier uses 1 input field and 4 output blocks so the result is easy to scan and copy.

Paste any CSS and get a single-line, minified version that's safe to drop into production. Comments, redundant whitespace and unnecessary semicolons are stripped; important comments (/*! … */) are preserved. The savings in characters and percent are reported. Runs entirely in your browser; your stylesheet never leaves this page.

Common searches

  • css minifier
  • minify css
  • compress css
  • css compressor
  • css optimizer
  • shrink css

Related tools

Tools that work with the same formats — most users open one of these next.

DevMinifier

HTML Minifier

Minify HTML — collapse whitespace, drop comments and optionally compress inline JS and CSS.

Try it →
DevMinifier

JavaScript Minifier

Minify JavaScript with Terser — compress, mangle and ship the smallest possible bundle.

Try it →
DevBeautifier

CSS Beautifier

Pretty-print CSS — choose 2-space, 4-space or tab indentation for readable stylesheets.

Try it →
DevReference

Regex Cheat Sheet

Interactive regex reference — anchors, quantifiers, groups, character classes, lookaround, and flags with examples.

Try it →
DevValidator

JSON Validator & Formatter

Validate JSON and see errors with line numbers — plus auto-format/beautify. Free, instant, in-browser.

Try it →
DevParser

URL Parser

Break a URL into its components — protocol, host, port, path, query parameters, hash — with each query param listed individually.

Try it →

Frequently asked

What is CSS Minifier?

CSS Minifier is a free online minifier that helps you minify CSS; strip whitespace, comments and unused syntax to ship smaller stylesheets. CSS Minifier uses 1 input field, returns 4 output values, and runs in your browser on the device.

What inputs and outputs does CSS Minifier use?

CSS Minifier uses 1 input field: CSS. CSS Minifier returns 4 output values: Minified CSS, Original size (chars), Minified size (chars), and Saved.

Do my files and data stay private?

Yes. CSS Minifier runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use CSS Minifier?

Open CSS Minifier, paste or fill in the input fields, and the result updates instantly. CSS Minifier runs in your browser with no upload and no waiting.

Which browsers does CSS Minifier support?

Any modern browser works in Chrome, Firefox, Safari, and Edge on desktop and mobile. CSS Minifier uses standard web APIs and does not require any plugin, extension, or sign-up.