Diff Checker

Compare two texts side by side and see the differences highlighted.

Original Text

Modified Text

About Diff Checker

Free online diff checker that compares two blocks of text side by side and highlights every difference — additions, deletions, and modifications. See line-by-line and character-level changes with color-coded highlighting. Perfect for comparing code revisions, reviewing document edits, checking configuration file changes, and verifying that text transformations were applied correctly. Works entirely in your browser with no file uploads.

Frequently Asked Questions

How does the diff comparison work?▾

The tool compares the two texts line by line and highlights additions (green), deletions (red), and modifications. It uses a standard diff algorithm to identify the minimal set of changes between the two inputs.

Can I compare code files with this tool?▾

Yes. The tool works with any text content including source code, configuration files, JSON, HTML, and plain text. It preserves whitespace and formatting for accurate code comparison.