Yes, all processing occurs locally in your browser. No code is uploaded to any server.

CSS Compare - Online Diff Viewer

Q: Does this work with minified CSS?

Yes, but use the 'Format Both' button first to expand the code for a readable line-by-line comparison.

Q: Can I compare SCSS or LESS?

Yes, text comparison works fine, though specific SCSS syntax highlighting might be limited.

Q: What do the colors mean?

Green indicates added rules, Red indicates deleted rules, and Yellow indicates modified properties.

Q: Is there a file size limit?

Limits depend on your browser's memory. Standard stylesheets work perfectly.

Original CSS

Modified CSS

Added (Right)

Deleted (Left)

Modified

Compare CSS Format Both Load Sample Clear

About CSS Compare

CSS Compare is a free tool designed for web developers and designers to find differences between two CSS stylesheets. Whether you are auditing changes in a new deployment, merging conflicting styles, or debugging broken layouts, this tool highlights additions, deletions, and modifications instantly.

Key Features

Smart Diffing: Identifies changes in selectors, properties, and values without getting confused by minor whitespace differences.
Auto-Formatting: Minified CSS is impossible to debug. Our "Format Both" button beautifies your styles with proper indentation before comparing.
Syntax Highlighting: Uses a full CSS editor (CodeMirror) to color-code IDs, classes, and attributes for readability.
Secure: All processing happens in your browser. Your CSS code is never sent to our servers.

How to Use

Input: Paste your original CSS in the left box and the new version in the right box.
Format: If your code is messy or minified, click "Format Both" to clean it up.
Compare: Click "Compare CSS" to see the differences. Green highlights mean added lines, while red highlights mean removed lines.

Frequently Asked Questions

Does this work with minified CSS?

Yes, but comparing single-line minified code is difficult. We strongly recommend clicking the "Format Both" button first, which expands the CSS into a readable structure for accurate line-by-line comparison.

Is the data private?

Yes. This tool is client-side only. Your CSS code remains in your browser and is never uploaded or stored on any server.

Can I compare SCSS or LESS?

Yes, since SCSS/LESS syntax is very similar to CSS, the text comparison works fine. However, the syntax highlighting might not perfectly color unique SCSS features like variables ($var) or mixins.

What do the colors mean?

• Green: Rules that exist in the "Modified" file but not the original (Added).
• Red: Rules that exist in the "Original" file but were removed.
• Yellow: Properties or values that were modified.

Is there a file size limit?

The limit is determined by your browser's memory. Text files up to a few megabytes typically work instantly. Very large files may cause a slight delay during formatting.