Compare CSV datasets

Compare two CSV files by a key column and export added, removed and changed rows.

1Choose
2Adjust
3Download

Choose your inputs

Choose both files, or paste each side below.

Two CSV files · 5 MB text / 24 megapixels image

Processed on this device. No file upload.

Original CSVChoose original CSVRevised CSVChoose revised CSV

Adjust your outputKey column (optional)Duplicate or empty keys are rejected.

How to use Compare CSV datasets

Choose the earlier and later CSV files.
Select a key column shared by both files.
Download a diff report with added, removed and changed rows.

Duplicate keys are rejected instead of being collapsed. Values are compared as text, including leading zeros.

What stays private, and what are the limits?

Input is processed in this browser and is not uploaded by the tool. Text and CSV inputs are limited to 5 MB; images to 24 megapixels. Your original input is never overwritten. Optional page measurement follows your analytics choice and excludes file names and contents.

Another local task?

Crop image Remove image metadata Extract image palette Clean CSV

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Link to this tool: https://www.toolpick.dev/free-tools/csv-compare