Remove duplicate rows from CSV files.
Detect and delete duplicate rows in your CSV data. Review the deduplicated result and export a clean file — all in your browser.
How it works
Three simple steps
Open your CSV
Drag and drop a CSV file with duplicate rows into the editor.
Remove duplicates
Use the deduplication tool to detect and remove duplicate rows.
Export clean file
Download the deduplicated spreadsheet as CSV, Excel, or JSON.
Key features
Everything you need
Automatic detection
Duplicate rows are detected automatically across all columns.
Review before deleting
See which rows are duplicates and decide what to keep before exporting.
Clean export
Export the deduplicated result as CSV, XLSX, or JSON.
No server required
Deduplication runs in your browser. Your data stays private.
Your data stays on your device
SheetTool processes everything locally in your browser. Your files are never uploaded to a server. No account required.
FAQ
Frequently asked questions
How do I remove duplicates from a CSV file?
Open your CSV in SheetTool and use the deduplication feature. Duplicate rows are detected and removed, then you can export the clean file.
Can I choose which columns to check for duplicates?
SheetTool checks all columns to identify exact duplicate rows. You can also manually review and edit the data before exporting.
Will I lose data when removing duplicates?
Only exact duplicate rows are removed. The first occurrence of each row is kept. You can review changes before exporting.
Is the deduplication tool free?
Yes. SheetTool is completely free with no sign-up or file size limits.
Ready to get started?
Open SheetTool and start working with your files right away. No sign-up needed.