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Join Two CSV Files by Column

Join two CSV files by ID, email, SKU, or another matching column. Choose left, inner, right, full, or unmatched results locally.

Quick start

Built for combining columns from two files using a shared id, email, sku, or key.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A joined CSV with matched and, when selected, unmatched rows.

  1. 1Upload the two source CSVs.
  2. 2Choose the key column in each file.
  3. 3Select the join type, inspect the result, and download it.
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How to Join CSV Files

  1. 1Upload the two CSV files
  2. 2Choose the matching column in each file
  3. 3Select a join type and download the result

Why Use This Tool?

  • ✓VLOOKUP-style joins
  • ✓Left, inner, right, full, and anti joins
  • ✓Column collisions are preserved safely
  • ✓Private worker processing

Frequently Asked Questions

Is joining the same as merging?

No. Merging stacks rows vertically; joining matches rows using a key column.

Can I join by email?

Yes. Choose the email column in each file.

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