How does it match rows between the two files to compare them?

It matches rows based on their content or a key column, then flags each as added, removed, or changed depending on which file it appears in and whether its values differ.

Does row order affect the comparison?

No, rows are matched by content rather than position, so reordered-but-otherwise-identical rows aren't flagged as changes.

Can I see exactly which columns changed in a modified row?

Yes, changed rows highlight the specific fields that differ between the two versions, not just that the row changed overall.

Does CSV Diff Checker upload my files to a server?

No. CSV Diff Checker runs entirely in your browser using on-device processing, your files never leave your device.

CSV Diff Checker

Compare two CSV files and highlight added, removed and changed rows.

Runs in your browser

Original CSV

Updated CSV

About this tool

Comparing two versions of a CSV file — an updated export against last month's, a corrected file against the original — by eye is slow and unreliable once the file has more than a handful of rows. This tool compares two CSV files and highlights exactly which rows were added, removed or changed between them, turning a manual row-by-row comparison into an instant, reliable diff.

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