CSV Diff

Compare two CSV files by a key column. The tool reports added rows, removed rows, and changed rows with column-by-column highlighting. Useful for comparing data exports, spotting drift between two sources, or reviewing the impact of a data migration.

How to use the CSV Diff

Paste both CSVs (must have a header row). Set the key column name — the tool matches rows between CSVs by this column. Output shows added rows (in B not A), removed (in A not B), and changed (key matches, other columns differ) with per-column highlights.