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Remove Duplicate Rows from CSV - Deduplication Tool

Remove duplicate rows from CSV files in your browser. Keeps unique rows only. processed locally in your browser.

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 or spreadsheet.
  2. 2Select the columns that define a duplicate.
  3. 3Process locally and inspect the output preview before downloading.
Preparing your private workspace…

How to Remove Duplicates

  1. 1Upload your CSV file with duplicate rows
  2. 2Tool automatically scans and removes exact duplicates
  3. 3Download your cleaned CSV with only unique rows

Why Use This Tool?

  • ✓Exact Duplicate Detection - Finds rows that match 100%
  • ✓Preserves First Occurrence - Keeps the first instance of each unique row
  • ✓Worker Processing - Keeps the interface responsive during larger jobs
  • ✓No Data Upload - Everything processed in your browser

Frequently Asked Questions

How does duplicate detection work?

The tool compares every row completely. If two rows have identical values in all columns, the duplicate is removed, keeping only the first occurrence.

Can it find similar (fuzzy) duplicates?

This tool detects exact duplicates. For similar-but-not-identical records, use the separate Fuzzy Duplicates tool.

What if I have headers?

Headers are automatically preserved and not considered for duplication. Only data rows are deduplicated.