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ToolSuite
CSV & Spreadsheet Tools

Compare Two CSV Files

Find the rows that exist in one file but not the other, and spot header changes.

Processed in your browser

Fill in the form and press “Compare” to see the result here.

How to use it

  1. 1Paste your CSV, or open the file in a text editor and copy it in.
  2. 2Adjust the delimiter and header options if the preview looks wrong.
  3. 3Adjust the options if you need something other than the defaults.
  4. 4Download the result, or copy it straight back into your spreadsheet.

About the Compare Two CSV Files

Rows are compared as whole records, so the order of the rows does not matter - only whether an identical row exists in the other file.

Header differences are reported separately, because a renamed column makes every row look changed and the real cause is one line.

For comparing the same records field by field rather than as whole rows, sort both files by their key column first.

Questions people ask

Is your data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your data never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.

Is it free, and do I need an account?

Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.