CSV Diff

CSV Diff

Updated August 20, 2026

Compare two CSV files online. See added, removed, and changed rows. Free CSV compare and CSV diff tool.

Left CSV

Right CSV

Features

  • Compare two CSVs cell by cell using headers
  • Flag added and removed rows by index
  • Ignore delimiter differences if both parse
  • Show which column changed
  • Local only

Common Use Cases

  • See what changed between two exports
  • Review a vendor file against last week
  • Check a transform did not scramble columns
  • Diff before and after a cleanup

Row index, not a primary key

Rows are compared by position. Inserting a row at the top marks later rows as changed. If you have an id column, sort both files by that id first, or use a dedicated data diff that keys on a column.

Examples

Valid - Value change
id,n
1,a vs id,n
1,b

Frequently Asked Questions

Can I key on a column?

Not yet. Sort both CSVs by that column in a sheet, then paste.

Related Tools

CSV Viewer

Inspect each side

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JSON Diff

Structural JSON compare

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Tips

  • Normalize delimiters first so both sides parse the same way.