Text diff
Compare two texts line by line and see exactly what was added and removed.
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Text diff
Paste the old version into text A, the new version into text B, and the differences appear line by line. Removed lines are marked with a minus, added lines with a plus, and untouched lines stay plain, so a change buried in a wall of text becomes obvious at a glance.
Use it whenever two versions of something drifted apart: two drafts of a contract, a config file before and after an edit, a translation against its source, a page of copy a client returned with silent changes, or two exports that should match but do not. The tally counts added, removed and unchanged lines, which is often the fastest answer to "did anything actually change here".
The comparison uses a longest common subsequence algorithm, the same approach version control tools use. That matters: it lines up the parts that did not move instead of declaring everything after an inserted line to be different. Insert one paragraph into a long document and you see one added line, not a hundred.
Two options loosen the match. "Ignore case" treats "Šišky" and "šišky" as the same line — useful when comparing data from systems that capitalize differently. "Ignore leading and trailing spaces" trims each line before comparing, so re-indented text does not drown the real changes. Windows and Unix line endings are always treated as equivalent. Very large inputs fall back to a faster line-by-line comparison so the tab never freezes.
Both texts stay in your browser. Nothing is uploaded, so you can safely compare contracts, private documents and unreleased code.