Compare two texts online for free with line-by-line diff highlighting. Spot added and removed lines instantly in your browser. No signup required.
First time here? Paste the original text into the left panel Your input is processed locally and disappears when you close the tab.
"What changed between these two versions?" is a question developers, editors, and lawyers ask every day. Our free Text Diff Checker answers it instantly: paste two texts side by side and get a line-by-line comparison with removed lines highlighted in red and added lines in green, plus counts of each.
The diff algorithm runs entirely in your browser, which makes it both fast and private — compare proprietary source code, contract revisions, or config files without anything leaving your machine. There are no size limits or rate caps; documents with thousands of lines compare in milliseconds.
It's the quickest way to verify what a teammate edited, confirm a deployment config matches staging, or check which paragraphs changed between drafts. For related cleanup work, normalize whitespace first with the Text Cleaner so the diff shows real changes only, or use Find & Replace to apply systematic edits before comparing.
Paste the original text into the left panel
Paste the modified text into the right panel
Click Compare to run the diff
Review red (removed) and green (added) highlights
Use the change counts to summarize the edit