How much smaller does minified CSS typically get?

It varies by how much whitespace, comments and formatting the original had, but a meaningful reduction in file size is typical for hand-written, readable CSS.

Does minifying change how the CSS actually behaves?

No, minification only removes unnecessary characters (whitespace, comments) — the actual rules and their effect on your page are unchanged.

Can I reformat minified CSS back to readable code?

Yes, the formatter direction takes minified or messy CSS and reformats it with proper indentation for readability.

Does CSS Minifier & Formatter upload my files to a server?

No. CSS Minifier & Formatter runs entirely in your browser using on-device processing, your files never leave your device.

CSS Minifier & Formatter

Minify CSS for production or format it for readability.

Runs in your browser

CSS input

Runs entirely in your browser, nothing is sent to a server.

About this tool

Production CSS should be minified to reduce file size and load time, while CSS you're actively editing needs to stay readable — going back and forth between these two states by hand is tedious. This tool minifies CSS for production or formats it for readability, handling both directions of that transformation in one tool.

Frequently asked questions

SVG Optimizer

Clean up and shrink SVG file size.

Hot

JSON Formatter

Format, validate and minify JSON.

Markdown Previewer

Write Markdown and preview the rendered output side by side.

File Converter

Convert data files between CSV, JSON and TSV.

Base64 Converter

Encode or decode text and files as Base64.

Base32 Encoder/Decoder

Encode or decode text as Base32.

ULID Generator

Generate sortable, timestamp-based ULIDs.

Semver Parser/Comparator

Parse and compare two semantic version numbers.

.env File Parser/Validator

Parse a .env file and flag duplicate keys, missing values and invalid names.

Markdown Table Generator

Build a Markdown table with a spreadsheet-style editor.

CSS Grid Generator

Visually build a CSS Grid layout and copy the code.

CSS Flexbox Generator

Visually build a CSS Flexbox layout and copy the code.

PDF Tools

Merge, split, compress and convert PDF files.

Image Tools

Compress, resize, crop and convert images.

Link & QR Tools

Shorten links and generate QR codes and barcodes.

Audio Tools

Convert audio files and turn text into speech, or speech into text.

Video Tools

Compress and process video files, right in your browser.

SEO & Web Tools

Meta tags, sitemaps, schema markup and other on-page SEO utilities.

Data & Spreadsheet Tools

Clean, convert and inspect CSV, TSV and tabular data.

File Tools

Archive, inspect and convert files, right in your browser.

Business Tools

Invoices, quotations, receipts and other business documents.

Social Media Tools

Resize images for social platforms, count hashtags and preview posts.