Remove Duplicate Rows Online - Free CSV Duplicate Cleaner

Remove Duplicate Rows Tool

Remove duplicate rows from CSV data using all columns or selected columns, then copy or download the cleaned CSV.

Remove duplicates

You can detect duplicates using the whole row or selected columns like email, phone, id or name. Always review the cleaned data before importing it into a database.

CSV Input and Duplicate Settings

Upload CSV File Optional. You can also paste CSV below.

Delimiter

Custom Delimiter

First Row

Duplicate Match

Keep Row

Case Matching

Whitespace

Selected Columns Used only when Duplicate Match is “Use selected columns”. You can enter header names or column numbers.

Paste CSV Data

0 Original Rows

0 Clean Rows

0 Removed

0 Duplicate Groups

Cleaned CSV

Removed Rows

Report

JSON Preview

Clean Data Preview

No preview yet. Paste CSV and click Remove Duplicates.

About This Tool

Remove Duplicate Rows is a free online CSV data tool that helps you clean duplicate records from CSV files or pasted CSV data.

You can upload a CSV file or paste CSV text, choose delimiter, use the first row as headers, detect duplicates using all columns or selected columns, keep the first duplicate, keep the last duplicate or remove all duplicate groups. You can also choose case-sensitive matching and trim whitespace before comparing values.

The tool creates cleaned CSV output, removed duplicate rows, JSON preview, duplicate report and table preview. You can copy the clean CSV, download the cleaned file, copy removed rows or copy the report.

This tool is useful for developers, students, data analysts, website owners, spreadsheet users, email list cleaning, customer data cleanup and database import preparation.

How to Use Remove Duplicate Rows

1. Paste CSV data or upload a CSV file.
2. Choose the delimiter such as comma, semicolon, tab, pipe or custom delimiter.
3. Choose whether the first row should be used as headers.
4. Choose duplicate matching mode: all columns or selected columns.
5. If using selected columns, enter header names or column numbers such as email, phone or 1,2.
6. Choose whether to keep first duplicate, keep last duplicate or remove all duplicate groups.
7. Click Remove Duplicates.
8. Review the cleaned CSV, removed rows, JSON preview and report.
9. Copy or download the cleaned CSV.

Privacy Note: This Remove Duplicate Rows Tool works directly in your browser using JavaScript. The CSV data you paste or upload is processed on the page and is not submitted through a form by this tool.

Frequently Asked Questions

Is this Remove Duplicate Rows Tool free?

Yes. This Remove Duplicate Rows Tool is free to use and does not require signup.

Can I upload a CSV file?

Yes. You can upload a CSV or TXT file, and the tool will process it directly in your browser.

Can I remove duplicates using only one column?

Yes. Choose “Use selected columns” and enter a column name such as email, phone, id or a column number such as 1.

Can I keep the first or last duplicate row?

Yes. You can choose to keep the first duplicate, keep the last duplicate or remove all rows that belong to duplicate groups.

Can I download the cleaned CSV?

Yes. After removing duplicates, you can copy or download the cleaned CSV file.

Does this tool upload my CSV data to the server?

No. The duplicate removal is done directly in your browser using JavaScript and the page does not submit your data through a form.