Compare two blocks of text and see every addition, deletion, and change — highlighted line by line.
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Browse All Tools →Compare two texts instantly and see exactly what changed. Our diff tool highlights additions (green), deletions (red), and unchanged lines — making it easy to review changes in code, documents, configs, or any text content.
The tool uses the Longest Common Subsequence (LCS) algorithm to find the optimal alignment between your two texts, then highlights the differences line by line. Everything runs in your browser — no data leaves your device.
Paste the first text into the left panel and the second into the right panel. The diff tool instantly highlights additions in green and deletions in red. No file upload required — everything runs in your browser securely.
Text diff tools compare two versions of text and show exactly what changed. Developers use it for code reviews, writers use it for document revisions, and teams use it to track changes before publishing or deploying.
Yes, the text diff tool works perfectly with code. Paste two versions of your script or config file and see the exact lines that differ. Great for reviewing changes before committing to git.
Yes, the tool handles large texts efficiently. Comparison runs in your browser so there are no server-side file size restrictions. Very large files may take a moment to process.
Completely private. All comparison happens client-side in your browser. No text is ever sent to a server, making it safe for confidential documents and private code.