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Organize · browser workspace

Remove Duplicates

Upload a list and in your browser delete duplicate rows. Process locally in your browser with HappyCSV.

Preparing your private workspace…
How to use this tool

Quick start

Built for cleaning repeated records before analysis, reporting, or a database import.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A cleaned file with duplicate rows removed while preserving your data locally.

  1. 1Upload your CSV.
  2. 2Rows are compared across every column.
  3. 3Process locally and inspect the output preview before downloading.

How to Remove Duplicates

  1. 1Upload your CSV.
  2. 2Rows are compared across every column.
  3. 3Process locally and inspect the output preview before downloading.

Why Use This Tool?

  • ✓Upload a list and in your browser delete duplicate rows.
  • ✓A cleaned file with duplicate rows removed while preserving your data locally.
  • ✓Files are processed locally in this browser.
  • ✓Keep the source file and review the result before importing it elsewhere.

Frequently Asked Questions

What does this tool support?

A cleaned file with duplicate rows removed while preserving your data locally.

What are the processing limits?

Up to 100 MB per CSV, 20 MB per complex document; 250,000 rows, 1,000 columns, 2 million cells, and 128 MB output. Jobs stop after two minutes. Large files may need splitting.

Are my files uploaded?

No. File processing stays in your browser. Files are not automatically saved for the next visit.

Can I process multiple files?

Yes, up to 50 files and 500 MB combined, subject to the per-file and processing limits. Batch results download as a ZIP; errors identify any omitted files.