Join CSV files by a shared key.

Combine CSV exports without matching row positions

Choose one to three stable identifiers such as SKU, warehouse and product ID. When an SKU repeats across warehouses, use SKU plus warehouse as a composite key. The join follows the exact values even when rows are sorted differently.

Pick the rows that belong in the output

A full outer join keeps records from both files. A left join keeps every original record and adds matching updated values. An inner join keeps only keys present in both. The preview reports matched, original-only and updated-only counts.

Resolve duplicate keys before joining

Every selected key component must be populated, and each combined key tuple must be unique on its side. Repeated or blank combinations stop the join rather than multiplying rows or silently choosing one.

Do not upload sensitive production data to this public beta. See privacy details or compare spreadsheet changes.