CSV Deduplicator
Options
Status
Idle
Rows before
0
Rows after
0
Duplicates removed
0
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.
- Column index starts from 0.
- Use trim values when CSV exports contain extra spaces.
- Ignore case is useful when values differ only by letter case.
Related tools
You may also find these tools useful.
CSV Viewer / CSV to Table
View CSV as a table and convert it to JSON.
CSV & Data
›
CSV Row Filter
Filter CSV rows by value, match type, and selected column.
CSV & Data
›
CSV Column Extractor
Extract a single column from CSV by name or index.
CSV & Data
›
SQL to CSV / Table Extractor
Extract rows from SQL INSERT statements and convert them to CSV.
CSV & Data
›
CSV Deduplicator FAQ
Can I remove duplicates by one column only?
Yes. You can choose a column by name or index and deduplicate based on that field.
Can I keep the last duplicate instead of the first?
Yes. The tool supports both keep-first and keep-last modes.
Does it support case-insensitive deduplication?
Yes. You can enable ignore case.
Is my CSV stored?
No. It is only processed in your current browser session.