How to Use Text Diff Checker
Paste an original and a changed version to get a clean, color-coded line diff computed with a longest-common-subsequence algorithm. Added lines are green, removed lines red, with running totals.
Open the Text Diff Checker tool →What is Text Diff Checker?
Compare two blocks of text line by line and see exactly what was added or removed. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Text Diff Checker
- Open the Text Diff Checker tool.
- Paste or type your input.
- Set any options provided.
- Copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
How does the comparison work?
It compares the two texts line by line and highlights additions and removals, so you can see exactly what changed.
Is it good for code or prose?
Both — any plain text works. For very large files, your editor's built-in diff may be faster.
Is my text uploaded?
No — the diff is computed locally in your browser.
Ready to try it?
Open Text Diff Checker →