Text Difference Checker
Compare two texts line by line and highlight added, removed and unchanged lines.
Files and input stay on your device. No upload or paid API.
Exact line comparison, case-sensitive. Up to 20,000 characters and 500 lines per text. Line endings are normalized; whitespace remains significant.
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About this tool
Compare two texts line by line and highlight added, removed and unchanged lines. Exact line comparison, case-sensitive. Up to 20,000 characters and 500 lines per text. Line endings are normalized; whitespace remains significant.
How to use
- Paste the original text on the left and the revised text on the right.
- Compare the texts, review added and removed lines, then copy or download the result.
Example
Changing the middle line of A / B / C to A / D / C shows B as removed and D as added; A and C stay unchanged.
Common question
Are capitalization and spaces ignored?
No. Comparison is line-based and case-sensitive; spaces matter. Line endings are normalized. Each input supports up to 20,000 characters and 500 lines.