How to use it
- Paste the first version in the left box and the second version in the right box.
- Press Compare. Tick the options if upper/lower case or extra spaces should not count.
- Read the result line by line; tick “Show only the differences” for long texts.
Questions and answers
Are my texts uploaded?
No. The comparison runs inside your browser with JavaScript; the two texts are never sent to a server. That makes it safe for contracts, code and other private documents.
How does it decide what changed?
It finds the longest sequence of lines that the two texts have in common and treats the rest as removed or added. When a removed line sits next to an added one, it compares them word by word and marks only the words that changed.
Can I compare code or very long texts?
Yes. It works on any plain text, including code, lists and CSV. Texts with a few thousand lines compare in under a second; for much larger files with many changes it falls back to a simpler comparison so the tab does not freeze.