Text Diff Checker
Compare two text blocks line by line.
Paste two versions of text to compare them line by line. Added lines are highlighted in green, removed lines in red, and unchanged lines in grey. Everything runs locally in your browser using a simple line-based diff (no dependencies).
Your input is processed locally in your browser — nothing is uploaded, stored or logged.
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How it works
- 1 Paste the original text in the left box.
- 2 Paste the changed text in the right box.
- 3 Review the highlighted differences below.
Common use cases
- Compare two versions of a document.
- Spot edits between drafts.
- Check config changes.
- Review pasted code line changes.
Frequently asked questions
Is my text sent to a server?
No. Everything runs locally in your browser — your text is never uploaded, stored or logged.
What kind of diff is this?
A line-based diff using a longest-common-subsequence algorithm — simple, readable and dependency-free. It is not a word-level or character-level diff.
Is there a size limit?
Very large inputs are skipped with a notice, since a line-by-line diff grows with the product of both line counts.
Is it really free?
Yes — free, with no signup and no limits.