Text Diff Checker
What is Text Diff Checker?
Text Diff Checker compares two versions of text and shows exactly what changed between them. Paste the original into Text A and the modified version into Text B, then click Compare. Added lines appear in green, removed lines in red, and unchanged lines stay neutral, with counts for each. It runs entirely in your browser, so drafts, code and documents never leave your device.
How to use
- Paste the original text into the Text A box.
- Paste the modified text into the Text B box.
- Click Compare to see the line-by-line diff.
- Review the stats, then copy any changed lines you need.
Features
- Line-by-line diff using a longest common subsequence comparison.
- Added lines highlighted in green, removed lines in red, unchanged lines in neutral gray.
- Live stats: total lines added, removed and unchanged.
- Handles up to 2,000 lines per text box.
- Works with plain text, code, CSV data and lists.
- Free, private, and no signup required.
Frequently asked questions
How do I compare two texts for differences?
Paste the first version into Text A and the second into Text B, then click Compare. Added lines show in green and removed lines show in red.
Does the diff checker work line by line or word by word?
It works line by line. Every line is marked as same, added or removed, which keeps the comparison easy to scan.
Can I use it to compare code or documents?
Yes. It is handy for comparing code revisions, draft versions of an article, two CSV exports or any pair of lists.
Is there a limit on text size?
Each text box supports up to 2,000 lines. Larger inputs are truncated with a notice so the comparison stays fast.
Is this tool free?
Yes, it is free with no signup and no limits.
Is my text sent to a server?
No. The comparison runs in your browser with JavaScript, so your text never leaves your device.