Compare CSV Files, free in your browser

Compare two CSV or TSV files with the same columns and export rows that appear in only one file, labeled with their source.

How to compare CSV files

1. Choose two CSV or TSV files.
2. Optionally ignore case and surrounding spaces.
3. Compare and download a CSV of rows found in only one file.

Limits & good to know

• Each CSV or TSV file can be up to 50 MB.
• Both files must have the same column names in the same order.
• Matching compares complete rows; you can ignore letter case and surrounding spaces.

Frequently asked questions

Are my files uploaded to a server?

Your files are processed on your device, not uploaded to our servers. Your file and edits are saved in this browser for recovery, and previous documents remain in Saved drafts when you open another file. Use Saved drafts to resume or delete individual copies, or clear this site’s browser data to remove all copies. Browser storage can be cleared or become unavailable; download important work.

Does comparison match rows by a selected ID column?

No. This version compares complete rows. Both files must have matching columns in the same order.

Is this really free, or free "until you hit a limit"?

Really free. Unlike most "free" PDF sites there is no task-per-day cap, no locked Pro features, no watermark stamped on your file, and no payment step before download. Every tool is the full tool.