Text Diff
Compare two blocks of text and see exactly what changed — line or word level, side-by-side or unified. Runs entirely in your browser; nothing is uploaded.
Paste text into both panes to see what changed.
Diffed entirely in your browser with jsdiff — your text is never uploaded.
Myers diff, in your browser — paste, compare, done.
A diff shows what changed between two versions of some text — which lines or words were added, removed, or left alone. It's the engine behind git diff, code review, and "track changes". This tool runs the classic Myers algorithm (via jsdiff) right in your browser.
Switch between side-by-side (original left, changed right) and unified (one column, git-style) views, and between line, word, and character granularity — line is best for code and config, word/character for prose and small edits. "Ignore whitespace" is handy when only indentation or trailing spaces changed. Because nothing is sent to a server, it's safe for config files, payloads, and anything sensitive.