Writer & Dev
Text Diff Checker: Compare Two Texts Side by Side
Paste two texts into the two panels and see additions in green, deletions in red, and unchanged content in gray.
Runs in your browser — your text is never uploaded or stored.
Quick answer
Text Diff is a free online tool that paste two texts into the two panels and see additions in green, deletions in red, and unchanged content in gray.
- Cost: free, no signup or limits.
- Privacy: runs 100% in your browser; text is never uploaded.
- Works on: desktop and mobile browsers, offline once loaded.
- Category: Writer & Dev.
Diff
- The quick brown fox + The quick red fox jumps over - the lazy dog+ the lazy cat
How to Use
- 1.Paste the original text into the left panel.
- 2.Paste the new version into the right panel.
- 3.Read the color-coded diff and copy or share it.
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FAQ
Does it diff by line or by word?
By line, which is the most useful view for most content.
Is my text sent to a server?
No — the diff algorithm runs entirely in your browser.
How large can the inputs be?
Tens of thousands of lines are fine; extremely large files may be slow.
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