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Compare CSV Online

Paste two CSV or TSV datasets. See row-level and cell-level differences in a table view.

Your data stays in your browser — nothing is uploaded to any server.

or try sample data

What is CSV Diff?

CSV Diff is a free tool for comparing two CSV or TSV files with a visual table-based diff. It highlights added, removed, and modified rows and shows cell-level changes within modified rows. Perfect for data migration testing, spreadsheet comparison, and database export validation.

  • Table-based view — see differences in a familiar spreadsheet-like format.
  • Cell-level comparison — modified rows show exactly which cells changed.
  • Custom delimiters — supports comma, tab, semicolon, and pipe delimiters.
  • Header row support — toggle to use the first row as column headers.
  • Privacy-first — all processing happens in your browser.