Text Diff Checker
Compare two texts line by line and highlight added, removed and unchanged lines.
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How to use the Text Diff Checker
- Open the Text Diff Checker.
- Enter your input in the fields provided - results update as you type where practical.
- Use Copy or Download to take the result with you, or Reset to start again.
How it works
Uses a longest-common-subsequence line diff computed locally. Lines only in the second text are additions; only in the first are removals.
Privacy note: this tool runs locally in your browser. Your input is not uploaded, stored in analytics, or placed in the page URL.
Frequently asked questions
Is the Text Diff Checker free?
Yes. It is completely free, needs no account, and runs in your browser.
Is my data uploaded when I use the Text Diff Checker?
No. Processing happens locally on your device. We do not upload your inputs, files or generated passwords.
How does the Text Diff Checker work?
Uses a longest-common-subsequence line diff computed locally. Lines only in the second text are additions; only in the first are removals.