Text Diff Checker

The Text Diff Checker shows exactly what changed between two versions of a text. Paste the original on the left and the changed version on the right, or drop a file onto each box, and the differences appear as you type. Removed lines are marked in red with a minus sign, added lines in green with a plus sign, and inside each changed line the words or characters that differ are highlighted.

Choose a side-by-side view to read both versions in parallel, or a unified view that lists removals and additions in one column, like a code review. On phones the comparison switches to the unified view automatically. Long unchanged sections are folded away so you can focus on what changed, and the Previous and Next buttons jump straight to each change. You can ignore differences in letter case, spacing or blank lines when they don't matter.

The summary counts lines added, removed and changed and gives a similarity percentage. When you need to share the result, copy it or download it as a standard unified diff (.diff) that works with patch, Git and code review tools. The comparison runs entirely in your browser, so contracts, drafts, code and configuration files never leave your device.