Get a 6 month tax extension
🔒 No upload — 100% in your browser

Text Diff Checker

Compare two texts and see exactly what changed — added and removed lines highlighted. It runs entirely in your browser — no signup, no installation, and nothing you paste or drop leaves your device.

Paste both versions and click Compare.

How to Use a Text Diff Checker

This text diff checker shows you exactly what changed between two versions of a document, piece of code, or article — without any of your content ever leaving your device. Paste the original version into the left box and the edited version into the right box, then click Compare. Lines that were removed appear highlighted in red, newly added lines in green, and within changed lines the exact words that were modified are marked as well. A summary at the top tells you how many lines were added, removed, and left untouched. You can swap the two inputs, clear both fields to start over, or copy the result as a unified diff — the standard format used by developers and version-control tools. It is a handy way to review edits, check what an editor changed in your copy, or verify that only the intended parts of a file were modified. No signup, no upload, no file limits.

More free tools

What is Text Diff Checker?

Text Diff Checker is a free online text tool built for writers, editors, students and anyone cleaning up copy. Compare two texts and see exactly what changed — added and removed lines highlighted In practice you paste the original text on one side and the changed text on the other, run the comparison, and then review the added and removed lines side by side.

Nothing you paste is uploaded: the conversion runs as JavaScript inside your browser tab, so drafts, manuscripts and internal documents stay on your machine.

How to use Text Diff Checker

  1. Paste the original text on one side and the changed text on the other.
  2. Run the comparison.
  3. Review the added and removed lines side by side.

Text Diff Checker FAQ

Is Text Diff Checker free to use?

Yes. Text Diff Checker is completely free and needs no account, no trial and no payment details. Every feature on the page is available without limits.

Is my data uploaded anywhere?

No. Text Diff Checker runs entirely in your browser, so the text, file or number you enter never leaves your device.

Does Text Diff Checker work on a phone or tablet?

Yes. It works in any modern browser on desktop, tablet and phone. There is no app to install and no account to create.

How do I use Text Diff Checker?

Paste the original text on one side and the changed text on the other. Run the comparison. Review the added and removed lines side by side.

Related tools