Spot every difference between two texts — 100% free, runs in your browser
Comparing two versions of a document by eye is slow and unreliable. This marks every added and removed line, which is useful for contract revisions, checking what an editor changed, or comparing configuration files.
Line by line. A single changed word marks the whole line as changed.
Very large documents may be slow, since the comparison runs in your browser.
No. Everything stays on your device, so you can compare confidential documents safely.