Text Diff Checker
Paste two pieces of text and instantly see added, removed, and unchanged lines highlighted side by side. Free and private — runs in your browser.
Spot every change between two drafts, configs, or code snippets instantly. Paste both versions, hit Compare, and every added line turns green and every removed line turns red — no guessing.
How to use Text Diff Checker?
Paste your original text into the left box.
Paste the modified version into the right box.
Click "Compare Texts" to see the diff.
Lines added are highlighted green; removed lines are red; unchanged lines are shown as-is.
Why use Text Diff Checker?
- LCS-based line diff. Uses the same Longest Common Subsequence algorithm as git diff for accurate results.
- Clear colour coding. Additions in green, removals in red, unchanged lines in grey — readable in seconds.
- Runs locally. Your text is compared entirely in your browser and never sent to a server.
Professional Features
Line-level comparison
Differences are detected and displayed line by line using the LCS (longest common subsequence) algorithm.
Clear colour coding
Added lines are green with a + prefix; removed lines are red with a − prefix — readable at a glance.
Runs locally
Your text is compared in your browser and never sent to any server.
Common Questions
What algorithm does it use?
The tool uses a line-level LCS (Longest Common Subsequence) diff, the same approach used by tools like git diff.
Is it good for code comparison?
Yes. The line-based output works well for source code, config files, and any line-oriented text.
Is it free?
Yes, completely free with no signup and no upload.