Text Diff Checker
Compare two texts side by side and highlight added, removed, and changed lines instantly.
+2 added-2 removed
- The quick brown fox jumps over the lazy dog
+ The quick red fox jumps over the lazy cat
How to use Text Diff Checker
- 1Paste the original text on the left.
- 2Paste the new text on the right.
- 3See the highlighted differences below.
- 4Copy the changed lines if needed.
Frequently asked questions
How does the diff work?
We use a line-level Myers diff algorithm to detect additions, removals, and unchanged lines.
Is the Text Diff Checker free?
Yes — every ToolFlexPro tool is 100% free with no signup, watermark, or hidden limit.
Is my text kept private?
Absolutely. Everything runs directly in your browser — nothing is uploaded to a server.
Does it work on mobile?
Yes. The tool is fully responsive on phones, tablets, and desktops.
Do I need to install anything?
No installs. It runs instantly in any modern browser.