How to Remove Duplicate Rows from CSV Files

Duplicate records in customer email lists, product catalogs, or database exports degrade data quality and waste resources.

### Step-by-Step Deduplication with OnlineCSV

1. Open the [Remove Duplicates from CSV](/remove-duplicates-from-csv) tool.
2. Upload your CSV file.
3. Select your deduplication criteria:
- **Full Row Match**: Removes rows where every single cell is identical.
- **Column Match**: Select specific columns (e.g. `Email` or `User ID`) to identify duplicates.
4. Choose whether to **Keep First** or **Keep Last** occurrence.
5. Click **Remove Duplicates** and download the clean CSV.