CSV Deduplicate
Remove duplicate rows from a CSV. Dedupe on the full row, or just on selected key columns (e.g. dedupe by email).
Dedupe by (pick one or more columns; all selected = full-row dedupe)
How to use CSV Deduplicate
- Paste CSV and pick the columns to dedupe by.
- Toggle case-insensitive and trim if needed.
- Click Deduplicate and copy the cleaned CSV.
What is CSV Deduplicate?
Picking specific columns deduplicates by their combined value — typical use case is keeping one record per email or one per customer ID even when other columns differ. Case-insensitive and trim options handle minor variations.
FAQ
- Which row is kept on a match?
- The first occurrence — same order as appearance in the input.
- Is my data uploaded to a server for processing?
- No. Everything runs locally in your browser. Your CSV data stays entirely on your device and is never uploaded anywhere.
- How fast is it for large files?
- Processing speed depends on your device since everything runs in your browser. Most files under a few hundred thousand rows process in seconds.
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