Compare two CSV files online — free

Compare two versions of the same spreadsheet exported as CSV — an OLD/baseline version and a NEW/current version that share a key column (use the first column as the key if no obvious id/sku/account column exists). Detect and report: rows ADDED in NEW (key not in OLD); rows REMOVED (key in OLD but not NEW); rows CHANGED (same key, one or more differing values — list which columns changed with old->new values); DUPLICATE keys within either file; and BLANK cells in columns that are otherwise populated. Output a findings summary with a count per category plus the detailed list of changed rows. Paste two versions of a spreadsheet (CSV) and instantly see what was added, removed, changed or duplicated. Free to try, no signup — a subscription unlocks the full report and export.