CSS Code Beautifier

Unminify CSS Online: Turn One Long Line Into Readable Code

Minified CSS is one enormous line with every space stripped out. That is exactly what you want in production and exactly what you cannot work with when something is broken and you need to find the rule causing it.

This tool reverses that. Paste minified or inconsistently formatted CSS, press Beautify, and get back properly indented code with one selector and one property per line — ready to read, search, and debug.

What It Changes, and What It Does Not

This distinction matters more than any feature.

It changes: whitespace, indentation, and line breaks. Selectors get their own lines. Properties are indented inside their blocks. Rules are separated so you can see where one ends and the next begins.

It does not change: your rules, selectors, values, or their order. Nothing is renamed, merged, reordered, or optimised. The stylesheet behaves identically before and after — only its shape on screen is different.

That guarantee is what makes it safe to run on production CSS you did not write and do not fully understand yet.

Copy or Download

Two outputs. Copy puts the formatted CSS on your clipboard for pasting into an editor. Download .css saves it as a file, which is the better route when the stylesheet is large or you want to keep the readable version alongside the minified original.

Why You End Up With Unreadable CSS

Several routes lead here, and none of them involve anyone writing bad code on purpose.

You inherit a site and only the built stylesheet survives — no source files. A build tool minifies everything and you need to check what actually shipped. A plugin or theme outputs compressed CSS you have to override. A colleague pastes a chunk into a ticket with the formatting flattened. Or a file has simply drifted over years, with three developers using three indentation styles.

Reformatting is the first step in every one of those situations, because you cannot review what you cannot read.

A Realistic Example: Overriding a Theme

A developer needs to change a button colour on a site built with a theme he did not write. Browser dev tools point him to a rule inside a 400KB minified stylesheet with no line breaks at all.

He copies the relevant chunk, pastes it in, and beautifies. The formatted output shows the full selector chain and every property in the block, making it clear the colour is being set by a more specific selector than the one he was targeting.

He writes his override with the correct specificity, and the change sticks on the first try instead of after four rounds of adding !important to things.

Formatting Before a Code Review

Reviewing a stylesheet is far quicker when each declaration sits on its own line, because a diff can then show exactly which property changed rather than flagging one enormous line as modified.

Running messy CSS through a formatter before committing keeps future diffs readable, and it makes minified css readable for anyone who has to look at the file after you.

Who Uses It

Front-end developers debugging inherited stylesheets. WordPress and theme users writing overrides. Students reading real-world CSS. Anyone handed a compressed file who needs to understand it before changing it. When you are ready to ship, the CSS Minifier reverses the process, and the JSON Formatter / Validator does the same job for JSON.

Make Your Stylesheet Readable Again

You cannot fix what you cannot follow. Paste your compressed stylesheet into the tool above to unminify CSS online in one click, then get on with the actual problem.