Text Diff Checker
Compare two texts side by side and see exactly which lines changed, were added or removed — free, fast and private.
Your diff will appear here.
How to use Text Diff Checker
- Paste the original text in the first box.
- Paste the changed text in the second box.
- Click Compare Texts.
- Added lines are marked +, removed lines −, unchanged lines are shown plain.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
Is the Text Diff Checker free?
Yes, it is 100% free with no sign-up. Your files and data stay in your browser.
How does it compare the texts?
Line by line. Lines in both texts are unchanged; lines only in the new text are added; lines only in the old text are removed.
Is my file uploaded to a server?
No. This tool runs entirely in your browser — your file is never uploaded.
Does it compare word by word?
No — this tool compares whole lines, which is best for documents, lists and code.