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CSV Merge & Join

Combine two CSV datasets using a matching column. Ideal for enriching exports with metadata, syncing CRM lists, or joining analytics tables.

Shipped

Browser local

CSV samples

Loaded sample: Default sample

CSV data

Supports header rows, quoted values, and multi-line fields.

Secondary CSV data (to join)

Delimiter

Use first row as headers

Add both CSV files with headers to configure the join columns.

What this tool does

CSV Merge & Join helps you combine two CSV datasets using a matching column. Ideal for enriching exports with metadata, syncing CRM lists, or joining analytics tables.

What you get

CSV Merge & Join produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.