100% Local — never leaves your browser
Click to run, or auto-updateText Diff Checker
Compare two blocks of text and see the differences highlighted line by line.
How to use this tool
Paste the original text on the left and the changed text on the right, then click Compare. Removed lines are highlighted in red, added lines in green, and unchanged lines are shown without highlighting. Switch on Auto update to refresh the comparison as you type in either box.
FAQ
Is this text diff checker free to use?
Yes, this tool is completely free to use with no limits on how often you can use it.
Does my text get uploaded anywhere?
No. The comparison happens directly in your browser. Your text never leaves your computer.
How does the diff highlighting work?
Lines only in the original text are shown in red, lines only in the changed text are shown in green, and unchanged lines are shown as-is.