Free · Fast · Privacy-first

CSS Pretty Print

Turn a single line of minified CSS into a neatly formatted, human readable stylesheet with FixTools.

⚡

Converts minified CSS to multi-line, indented code

🔒

Works on any valid compressed stylesheet

✨

Handles @media, @keyframes, and nested at-rules

⚡

Free, instant, and private, runs in your browser

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

FreeNo signupWhite-label

Add this CSS Formatter to your website

Drop the CSS Formatter into any page — blog post, product docs, intranet, school portal — with a single line of HTML. Your visitors get the full tool, processed entirely in their browser. No backend, no uploads, no signup.

Files stay 100% in the visitor's browser
Responsive — adapts to any container width
Free forever, no API key needed

Embed code

<iframe
  src="https://www.fixtools.io/css-tool/css-formatter?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="CSS Formatter by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

<iframe
  src="https://www.fixtools.io/css-tool/css-formatter?embed=1"
  width="100%"
  height="780"
  frameborder="0"
  style="border:0;border-radius:16px;max-width:900px;"
  title="CSS Formatter by FixTools"
  loading="lazy"
  allow="clipboard-write"
></iframe>

Attribution-friendly: a small "Powered by FixTools" link appears in the embed footer.

Pretty-Printing CSS: Turning Minified Stylesheets Back into Readable Source

Minified CSS is designed for machines rather than humans. A stylesheet that spans hundreds of lines in its source form is collapsed into a single line of dense text during minification, which is perfectly efficient for network delivery but nearly impossible for a developer to read. Pretty printing reverses this transformation by inserting newlines and indentation tokens that have no effect on the browser's parsing but make an enormous difference to a developer trying to understand the file. Every declaration moves to its own line, every rule block opens and closes on consistent lines, and nested at-rules are indented to reflect their hierarchy. The pretty printed output is functionally identical to the minified original; it differs only in the whitespace that humans need and machines ignore.

The need to pretty print CSS arises in several common situations. A third party script or plugin ships only a minified stylesheet with no source available. A build tool has accidentally overwritten the source with the minified version because someone misconfigured an output path. An inherited codebase contains only production files because the original development repository was lost when a previous contractor handed over the project. A debugging session in DevTools points to a specific selector but the on disk CSS file is too dense to find it visually. In all these cases, pretty printing is the first step toward understanding and safely editing the CSS, and it converts an opaque artifact into a working document.

The pretty printed output is not a perfect substitute for original source. Comments and the original developer's formatting choices are not recoverable from minified CSS because the minifier deleted them as part of the size reduction process. Variable names introduced by build tools may have been mangled into shorter forms that no longer convey meaning. Property orderings may have been adjusted by the minifier for compression benefits. What you get back is a fully readable functional stylesheet that does exactly what the original did, but it is a reconstruction rather than an exact copy of how a developer originally wrote the file.

When using pretty printed CSS as a working document, always validate any changes by loading the modified file in a browser and checking the rendered result. The pretty printed output is a faithful representation of the minified input, but if you edit it and then re minify, you should also confirm that the re minified output produces the same visual result as the original minified file. Treat the pretty printed file as a maintenance reconstruction, not as a recovered source repository, and prefer to retrieve the actual source from version control whenever it exists.

W3C CSS Syntax Specification Google Web.dev: Learn CSS

How to use this tool

💡

Paste minified CSS into the input panel and click Format. The pretty-printed output displays immediately with full indentation.

How It Works

Step-by-step guide to css pretty print:

1
Copy minified CSS
Select and copy the minified CSS you want to make readable. The source might be a production CSS file, the response body of a network request in DevTools, a chunk from a build output directory, or a paste from documentation. Whatever the source, you only need the raw CSS text; you do not need to clean it up before pasting it into the pretty printer.
2
Paste into the formatter
Paste the minified CSS into the FixTools CSS Formatter input panel. There is no character limit and no preprocessing required. The pretty printer accepts any size of input and parses it locally in your browser so there is no upload step and no network round trip during the operation.
3
Format
Click Format to pretty print the output with full indentation and newlines. The transformation runs in a fraction of a second even for very large files because the work happens entirely on your device. The output panel updates immediately, and you can keep the minified input visible in the input panel for side by side comparison while you review the result.
4
Copy and edit
Copy the pretty printed output and use it as your working CSS file for editing or debugging. Save it to disk if you intend to use it as a long term reference, attach it to a bug report if you are using it to document an issue, or paste it into your editor and continue with the next step of your task. The output is plain text and travels cleanly through any tool that handles text.

Real-world examples

Common situations where this approach makes a real difference:

A developer inherits a production server with only minified CSS files and no source repository, they pretty-print each file to reconstruct a readable codebase before starting updates.

The handover from the previous team included only the deployed assets, no git history, no source files, and no documentation. The developer pretty prints every minified CSS file, saves the formatted output as the new working source, and begins a careful audit to identify which rules are still needed and which can be removed. The reconstruction is not perfect but it gives the team a working base to operate from, which is far better than continuing to ship a fully opaque artifact.

A security researcher pretty-prints a third-party CSS file to scan for any unusual selectors or content that could indicate a supply chain compromise.

Recent supply chain incidents have included malicious CSS that targeted login forms or hidden tracking pixels via attribute selectors. The researcher pretty prints the suspect file, scans for selectors that target sensitive form fields, and flags any rules whose purpose is not obvious from the surrounding context. The formatted output makes manual review tractable in a way that scanning the minified source would not have been.

A student pretty-prints a CSS framework's stylesheet to study how professional CSS is structured and learn naming and organisation conventions.

The student is learning by reading well known frameworks such as Bootstrap and Tailwind. They pretty print each framework's production CSS into a working file and then read through it section by section, noting how variables are organised, how breakpoint conventions are used, and how the framework structures its component classes. The pretty printed file becomes a study aid that supports learning in a way that the original minified bundle could not.

A site reliability engineer pretty-prints a CSS asset before correlating it with a CDN cache miss issue.

The engineer needs to identify whether the CSS being served from the CDN matches what was deployed from the build pipeline. Pretty printing both versions produces side by side comparable files where any differences in rules or selectors become visible to a simple diff tool. This kind of comparison is essentially impossible against minified files because byte level differences from minifier nondeterminism overwhelm any meaningful content differences.

When to use this guide

Use this whenever you have minified or compressed CSS and need to read or edit it, for debugging, auditing, or understanding a third-party stylesheet.

Pro tips

Get better results with these expert suggestions:

Use pretty-print to audit third-party CSS

Before including a third party CSS library in your project, pretty print it to review the selectors and specificity. You may find conflicts with your existing styles, unwanted global selectors that target generic tags, or specificity bombs that will be hard to override later. Auditing the pretty printed source is far faster than discovering these issues after the library is integrated and breaks something visible.

Combine with browser DevTools

Copy computed styles from browser DevTools into the pretty printer to see a formatted version of what the browser applied to a specific element after all cascade steps. The pretty printed result lets you read every contributing rule in order without having to scroll a narrow DevTools panel, and it is easier to paste into a bug report or share with a teammate when documenting an issue.

Pretty-print to estimate edit scope

Before agreeing to modify an unknown stylesheet, pretty print it and count the rules. A file that appears to be one line of CSS may expand to two thousand lines of formatted code, which is worth knowing before you estimate the effort involved. A quick pretty print and a glance at the resulting line count is far more accurate than guessing from the size of the minified file.

Save pretty-printed files with a .formatted suffix

When saving a pretty printed version of a minified file, use a .formatted.css suffix or a similar naming convention to distinguish it clearly from the original minified version. Future you, or anyone else reading the repository, will appreciate being able to see at a glance which file is the production artifact and which is the human readable reconstruction used for reference.

Pretty-print before debugging

When a visual bug appears on a page, pretty-print the relevant stylesheet before inspecting rules. Indented code is far easier to scan in browser DevTools than a single-line minified file.

Look for repeated selectors after pretty-printing

Minified CSS from generator tools sometimes contains duplicated selectors that are invisible in compact form. Pretty-printing makes them immediately visible.

Pretty-print then validate

After pretty-printing a minified file, run it through the CSS Validator to confirm the rules are valid CSS. This combination catches both structural and syntax issues before you start editing.

FAQ

Frequently asked questions

No. Minification removes all comments as part of the size reduction process, and the comments cannot be recovered from the minified output because the information is no longer in the file. Only the structural rules and declarations survive minification and become recoverable via pretty printing. If comments matter for your understanding of a stylesheet, you need the original source from version control rather than a pretty printed reconstruction of the production artifact.

Yes, from the browser's perspective. All selectors, properties, values, units, and at-rules are preserved exactly. The whitespace added during pretty printing has no effect on parsing or style application because the CSS parser normalises whitespace before interpreting the rules. You can use either version in production and the rendered page will look the same, although the minified version is preferred for production because it is smaller and transfers faster.

You would need to copy the CSS content from the CDN response first. Visit the CDN URL in your browser, select all the text, copy it, and paste it into the pretty printer. Direct URL input is not supported by the in browser tool because it cannot make cross origin requests on your behalf. For automation involving CDN URLs, a command line script using curl or fetch combined with a formatting library would be a better fit than this in browser tool.

Yes. Any valid CSS, including compiled framework stylesheets from Bootstrap, Tailwind, Bulma, or any other framework, can be pretty printed. The output will show every generated class in full indented form, which can be extremely long for utility first frameworks like Tailwind. Be prepared for files that span tens of thousands of lines after pretty printing, since utility frameworks generate one rule per utility class and they all become individually visible in the formatted output.

No. Specificity is determined entirely by the selectors used, not by whitespace or formatting. Pretty printing cannot change how the cascade resolves style conflicts because it never modifies the selectors themselves. If your minified file had a selector with high specificity, the pretty printed version will have the same selector with the same specificity, and the cascade will resolve conflicts in the same way it did before.

In practice the two terms describe the same operation. Pretty printing emphasises that the input was probably minified or compressed and that the goal is to make it visually readable. Formatting is a more general term that applies to any reorganisation of whitespace in source code. Both produce the same kind of output: indented, newline separated, structurally clear CSS that a human can scan and edit easily. If you find a tool advertised as one or the other, expect the same kind of result.

Inline styles in the style attribute of an HTML element are CSS declarations but lack the surrounding rule structure that the pretty printer expects. To pretty print inline styles, extract the declaration block, wrap it in a temporary selector and braces, paste it into the formatter, format it, and then remove the placeholder wrapper from the output. This workaround takes only a few seconds and produces the same readable result as formatting any other CSS.

If the output is unexpected, the source CSS may contain syntax errors that the pretty printer is faithfully preserving in its output. Run the original through the CSS Validator first to identify any errors, fix them in the source, and then pretty print the corrected version. Common issues include unclosed braces, missing semicolons inside at-rule blocks, and stray characters from a copy paste that introduced an unintended fragment of HTML or JavaScript.

Yes. Native CSS nesting, supported in modern browsers, is parsed and formatted correctly by the pretty printer. Nested rules are indented one level further than their parent rule, which makes the nesting hierarchy a visible part of the formatted output. This works for nesting of any depth and combines with at-rule nesting so a deeply nested media query inside a nested rule produces clear stair stepped indentation in the output.

The pretty printer does not consume or produce source maps. It works only with CSS text, and the output it produces is structurally faithful to the input but it does not carry a source map that points back to original line numbers in the minified file. If you need to map a rule in the pretty printed output back to a position in the minified source, you can use a text search since the selectors are preserved exactly between input and output.