How the diff is built
The tool finds the longest common sequence of lines and creates a readable diff: a minus marks removals, a plus marks additions, and a space marks unchanged lines.
Comparison limit
Each side supports up to 500 lines. The limit prevents the quadratic comparison algorithm from blocking the tab on very large documents.
Local processing
Both versions are compared by browser JavaScript and are never sent to third parties.
Frequently asked questions
Does it compare words or lines?
It compares lines. This works well for configuration, lists, notes, and small code snippets.
Why can visually similar lines differ?
Comparison is exact: letter case, whitespace, and every other character are significant.