CSV Deduplicator
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What is a CSV Deduplicator?
A CSV Deduplicator helps you remove duplicate rows from a CSV file or pasted CSV text.
This is useful for cleaning exports, removing repeated emails or IDs, preparing imports, and simplifying datasets before further processing.
How to use the CSV Deduplicator
- Paste your CSV into the input field.
- Choose the delimiter or use auto detect.
- Optionally select a column name or index if you want to deduplicate by one field only.
- Choose whether to keep the first or last duplicate, then click Remove duplicates.
Tips
- If no column is selected, duplicate detection works on the whole row.
- When deduplicating by a specific column, remember the first column is index 0.
- Use trim values when CSV exports contain extra spaces.
- Ignore case is useful when values differ only by letter case.
Related guides
Learn the workflow behind this tool and what to check next.
CSV deduplication checks before removing repeated records
Duplicates depend on the business key you choose. Two identical rows and two records for the same entity are not always the same problem.
Choose the key
Use stable identifiers or a deliberate combination of columns rather than deduplicating every field by default.
Normalize carefully
Decide whether case, surrounding whitespace, phone formatting, accents, and leading zeros should count as meaningful differences.
Choose the survivor
Define whether the first, last, newest, most complete, or otherwise preferred record should be retained.
Audit the result
Record removed counts, inspect sample duplicate groups, and preserve the source so an overly broad rule can be reversed.
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