Spotting what changed between two versions of a document by eye is slow and unreliable. This free text diff checker compares any two texts and shows you exactly what was added, removed or changed. That might be two drafts of an article, a contract before and after the other side's edits, two versions of a config file, an AI rewrite against your original, or code before and after a fix. Paste the original on the left and the changed version on the right. The diff appears instantly, with removed lines in red, added lines in green, and, on changed lines, the specific words that differ highlighted inside the line, so a single changed number or comma doesn't get lost. Switch between a unified view (best on phones) and a side-by-side view, and use the options to ignore case, ignore extra whitespace, or hide unchanged lines and show only the differences with a little context. A summary counts lines added, removed and unchanged. Under the hood, it uses a longest-common-subsequence algorithm, the same idea behind diff and Git, so the alignment is accurate even when lines move around. Your texts stay in your browser. Nothing is uploaded, so it's safe for confidential documents.
Compare texts
How to compare two texts
- Paste the original on the left and the new version on the right.
- Read the highlighted differences: red removed, green added.
- Use the options to ignore case or spacing, or show only changes.
Good uses
- Checking edits to contracts and documents.
- Comparing an AI rewrite with your original.
- Finding a changed setting in a config file.
FAQ
How does the diff work?
It finds the longest common subsequence of lines, then compares words within changed lines, like Git and the diff command.
Is there a size limit?
A few thousand lines compare quickly; very large files may be slow on phones.
Can I compare Word or PDF files?
Copy the text out of them and paste it here.
Is my text uploaded?
No. The comparison runs entirely in your browser.
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