Text Diff Checker

🔒 The comparison runs locally in your browser.

🔒 Privacy: Inputs remain on your device and are not sent to a server.

Text Diff Checker

Compare two blocks of text line by line and see what was added, removed, or changed.

How the text comparison works

Paste the original text into the first box and the changed text into the second, then click "Compare". Added lines are highlighted in green, removed lines in red, and unchanged lines show with no highlight. The comparison works line by line.

Frequently Asked Questions

How are differences shown?

Added lines are highlighted in green with a +, removed lines in red with a −, and unchanged lines show with no highlight.

What happens with very long texts?

To keep the page fast, comparisons are capped at 4,000 lines per text. Beyond that, you’ll see a message instead of a frozen page.

Does it compare lines or individual characters?

It compares line by line, not character by character within a line.