CSS Diff Checker

Paste two versions of CSS to compare additions, removals and edited lines with CSS syntax highlighting. The diff runs locally in your browser.

原始文本

修改后文本

CSS syntax locked

This page automatically highlights CSS tokens, so you do not need to pick a language before comparing files.

Private local compare

The diff runs in your browser. Source code, API payloads and configuration files are not uploaded to a server.

Split or unified review

Use split view for side-by-side review, unified view for compact patches, and hide unchanged lines for large files.

Compare CSS files online

This CSS diff checker is built for developers who need a fast, private way to compare code and configuration changes. Paste two versions, run the comparison, and review additions, removals and inline edits with CSS syntax highlighting already enabled.

Paste or upload the original CSS file on the left.
Paste or upload the changed CSS file on the right.
Compare the result in split or unified view, then hide unchanged lines when you only need the edited regions.

Private browser-based CSS comparison

The diff runs locally in your browser, which keeps source code, API responses, secrets and configuration files on your device. One recent session may be stored in your browser storage for restore, and you can clear it from the tool at any time.

Common CSS diff workflows

Compare selector, variable and media query changes.

Review design token edits before deploy.

Spot added or removed declarations after formatting.

CSS syntax highlighting

Highlighting is locked to CSS on this page, so the language selector stays out of the way. The parser focuses on tokens such as selectors, custom properties, media queries, declarations while the diff engine highlights the actual text changes.

.css

Reference: MDN CSS reference

CSS diff checker FAQ

What is a CSS diff checker?

A CSS diff checker compares two versions of CSS content and highlights added, removed and edited lines. This page locks syntax highlighting to CSS, so language tokens are easier to scan while reviewing changes.

Does this CSS diff tool upload my code?

No. The comparison runs in your browser. Your CSS files are not uploaded to a server when you click Compare.

Which CSS file types can I compare?

You can paste or upload plain-text files such as .css. Any text file can be compared, but this page highlights CSS syntax automatically.

Can I compare large CSS files?

Yes. Large comparisons run in a background worker so the browser stays responsive. Very large files may still take a few seconds on your device.