CSV Dedupe
Remove duplicate rows from CSV files
Files stay on this deviceRuns entirely in your browserFree — no signup
Drop your file here or browse from your device
Accepts CSV, TSV, TXT. Maximum input: 10 MiB. Files above this hard limit are rejected before local processing.
How to Use
- Upload your CSV
- Select columns to check for duplicates
- Choose which occurrence to keep
- Download deduplicated CSV
Features
- Select columns to check
- Keep first/last occurrence
- Preview duplicates
- Show duplicate count
Use Cases
- Clean up contact lists
- Remove repeated entries
- Ensure data uniqueness
Frequently Asked Questions
Is CSV Dedupe free to use?
Yes. It is free to use with no signup or watermark.
Is my data private when using CSV Dedupe?
Absolutely. All processing happens in your browser. Your data never leaves your device.
How are duplicates detected?
Rows are compared across all columns or selected columns. The first occurrence is kept and subsequent duplicates are removed.