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What this remove duplicates tool offers
Clean CSV data by removing duplicate rows using flexible dedupe modes.
- Full-row dedupe: Rows are duplicates only when all cells match.
- Column dedupe: Use one selected column as duplicate key.
- Case-sensitive option: Treat A and a as different when enabled.
- Summary: See before rows, unique rows, and removed duplicates.
- Preview: Inspect first 25 output rows before export.
- Private: No uploads required.
Why remove duplicates?
Deduplication improves data quality for analysis, imports, and reporting.
- Cleaner data: Reduce repeated records and inconsistencies.
- Smaller files: Lower file size and faster downstream processing.
CSV parsing and deduplication run entirely in your browser with no server upload; heavy output updates are deferred so the interface stays responsive on larger datasets.
Options at a glance
- By full row: Every cell must match to count as duplicate.
- By column: Use a specific column to identify duplicates.
- Case-sensitive: Enable to distinguish uppercase and lowercase values.
Frequently asked questions
What does dedupe by column mean?
Only the selected column is used to detect duplicates; first occurrence is kept.
What does case-sensitive do?
It controls whether uppercase/lowercase are considered different for column dedupe.
Which delimiters are supported?
Auto, comma, semicolon, tab, and pipe.
Is my data uploaded?
No. Processing happens in your browser only.