Extracto
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Join CSV Files by Key

Enrich one CSV with columns from another using a shared key. Choose left or inner join and download the matched table.

Key matching

Processed on your device. No upload, account or daily limit.

Two files up to 5 MB and 10,000 rows each, with up to 100 output columns. The right key must be unique; empty keys never match. Values stay as text, including leading zeros.

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