CSV Deduplicator

Remove duplicate rows from CSV files based on entire rows or specific key columns.

Processing Architecture: Client-Side (Processed locally in your web browser with zero server uploads)

How to Use CSV Deduplicator

  1. Step 1: Upload CSV

    Drop your CSV file or paste records.

  2. Step 2: Select Match Criteria

    Match full identical rows, or select specific columns (e.g., Email or User ID).

  3. Step 3: Export Unique Rows

    Download clean CSV with all duplicate rows removed.

Key Features & Capabilities

  • Deduplicate by entire row or specific key columns (e.g. primary key, email)
  • Displays count of duplicates removed vs. unique records retained
  • Preserves original column ordering and row order

Frequently Asked Questions

Which duplicate row is kept?

By default, the first occurrence of each unique key is preserved, and subsequent duplicates are removed.

Can I deduplicate based on just an Email column?

Yes, you can select any individual column as the deduplication key.

Related Tools

  • CSV Viewer & Table Inspector — Load, inspect, search, filter, and sort large CSV spreadsheet data in an interactive grid.
  • CSV Formatter & Beautifier — Clean, align, and standardize messy CSV files with consistent quoting and delimiters.
  • CSV Sorter — Sort CSV spreadsheet rows alphabetically (A-Z), numerically, or chronologically by column.