Text Diff Checker Online
Compare two texts and highlight additions, deletions, and changes line by line. Side-by-side diff view.
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About Text Diff Checker
Compare two text blocks side-by-side with colour-coded diff highlighting. Green for additions, red for deletions, yellow for changed lines. Useful for comparing code, documents, translations, and configurations.
Comparing two versions of a text block by eye is slow and error-prone once the text runs beyond a few lines — a single changed word buried in a paragraph is easy to miss, which matters when comparing contract revisions, checking code changes outside a version control diff view, or verifying that a document edit didn't introduce an unintended change elsewhere. This tool highlights additions and deletions with colour-coding (green for additions, red for removals) side-by-side, making even small changes immediately visible regardless of how much surrounding text is unchanged. It's used by writers comparing draft revisions, developers reviewing text or config changes outside their usual diff tooling, and anyone who needs to verify exactly what changed between two versions of a document.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
Can I compare code files?
Yes. Paste code from two files to see line-by-line differences. No syntax highlighting — for full code diffing, use VS Code built-in diff editor.
Is diff case-sensitive?
Yes by default. You can toggle case-insensitive comparison to ignore case differences.
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