---
title: "Remove Duplicate CSV Rows · Outil gratuit et anonyme · Laurens De Leeuw"
canonical: "https://laurensdeleeuw.be/fr/tools/remove-duplicate-csv-rows"
markdown_alternate: "https://laurensdeleeuw.be/fr/tools/remove-duplicate-csv-rows.md"
language: "fr-BE"
content_type: "interactive-tool"
robots: "noindex, follow"
---

# Remove Duplicate CSV Rows

Paste a CSV and get a clean copy with every duplicate row removed. Utilisation gratuite sans compte, adresse e-mail ni paiement. Le résultat est téléchargé immédiatement.

Paste a CSV and get a clean copy with every duplicate row removed.

Dedupe a CSV in one click. Compare by the whole row or by a single column, optionally case-insensitive and whitespace-tolerant. Header row is always kept. Strict CSV parser so quoted fields with commas are handled correctly.

- **Category:** Text
- **Availability:** Free to use without an account, email address, subscription, or payment.
- **Input:** Entered in the browser

## How it works

1. Paste your CSV into the editor.
2. Pick whether to dedupe by the whole row or by a single column.
3. Process and download the deduplicated.csv file.

## Use cases

- Remove duplicate contacts before a CRM import.
- Dedupe an order export so a finance report doesn't double-count.
- Clean a scraped CSV that has the same URL repeated across pages.
- Drop repeated rows out of a long log paste.

## Frequently asked questions

### Is the row order preserved?

Yes. The first occurrence of every row is kept in its original position. Only later duplicates are removed.

### Can I dedupe by a single column?

Yes. Pick the column on the Dedupe tab and only the first row for each unique value in that column is kept.

### Does the header get deduplicated?

No. The first row is always preserved as the header when 'First row is a header' is ticked, even if it happens to look similar to data rows.

### How is case handled?

By default the comparison is case-sensitive. Untick 'Case-sensitive comparison' and 'Alice' and 'alice' count as the same value.

## Related tools

- [CSV Cleaner](https://laurensdeleeuw.be/fr/tools/csv-cleaner)
- [Remove Empty CSV Rows](https://laurensdeleeuw.be/fr/tools/remove-empty-csv-rows)
- [Remove Duplicate Lines](https://laurensdeleeuw.be/fr/tools/remove-duplicate-lines)
- [CSV to JSON Converter](https://laurensdeleeuw.be/fr/tools/csv-to-json)

## Using the interactive tool

Open the [canonical HTML page](https://laurensdeleeuw.be/fr/tools/remove-duplicate-csv-rows) to provide input and generate or download a result. This Markdown alternate contains the complete descriptive and instructional content, but it does not execute the interactive interface.