FileToastRemove duplicate CSV rows
Remove exact duplicate data rows while keeping the first occurrence and header.
How to use Remove duplicate CSV rows
- Choose a file (CSV / TSV) from your device.
- Check your selected input before processing.
- Run the tool, inspect the result, and download your output.
What this tool does
Remove exact duplicate data rows while keeping the first occurrence and header. Your original files are unchanged. Keep a copy and check the downloaded result before relying on it.
Questions about Remove duplicate CSV rows
Are my files uploaded?
This tool processes files in your browser. File contents are not uploaded to FileToast. Downloads stay wherever you save them.
Which rows count as duplicates?
Only exact duplicate data rows are removed. Similar spellings or differently formatted values are not fuzzy-matched.
Which occurrence is kept?
The first occurrence is retained, along with the original header.
What are the file and processing limits?
Up to 50 MB per file. Large or complex files can exceed your device’s or the converter’s capacity.