A SMALL TOOL FOR CHANGING DATA

Two files.
Every difference.

Compare CSV versions by a unique key. Find added, removed and changed rows, then take the differences with you.

Before

ORIGINAL

Choose your original CSVor drop it here · UTF-8 · up to 10 MB

UPDATED

Choose your updated CSVor drop it here · UTF-8 · up to 10 MB

Match rows usingOne unique, non-empty key per row.

COMPARISON COMPLETE

Status	Key	Details before → after

Export includes every changed row, even when the preview is limited. Formula-like values receive a leading apostrophe for safer spreadsheet opening.

Add two files with headers and a shared key column, or try the example above.