CSV / Excel De-Duplicator

Remove duplicate rows and clean columns in large CSVs without crashing Excel — streamed and processed in your browser.

100% In-Browser & Private — your data never leaves this device

PeachTools Pro

Batch processing, unlimited files, ad-free.

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How to use the CSV De-Duplicator

  1. Drop a CSV file or paste CSV text into the workbench.
  2. Select one or more columns that define a duplicate (for example Email).
  3. Optionally trim whitespace and drop empty rows, then run Remove duplicates.
  4. Preview the cleaned table and download the result as CSV.

FAQ

Is my spreadsheet uploaded?
No. Parsing uses PapaParse in your browser. Your data never leaves this device.
How many rows can I process for free?
The free tier processes up to 2,000 rows. PeachTools Pro unlocks unlimited rows and multi-file merging.

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