CSV/Excel Duplicate Remover
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About the CSV/Excel Duplicate Remover
The CSV/Excel Duplicate Remover finds and deletes duplicate rows from a spreadsheet, leaving one clean copy of each unique record. Duplicates creep into data through merges, repeated imports, and manual entry, and this clears them out automatically.
Duplicate records skew counts, inflate totals, and cause double emails or double shipments. Removing them is essential before analyzing a dataset, importing a contact list, or reporting figures you want to trust.
Deduplication runs in your browser, so your data never leaves your device. That keeps customer lists and records private while you clean them, with no upload or account required.
How to use the CSV/Excel Duplicate Remover
- Upload your CSV or Excel file.
- Choose whether to match duplicates on all columns or specific ones.
- Run the deduplication to identify repeated rows.
- Review how many duplicates were found and removed.
- Download the cleaned file with only unique rows.
Common use cases
- Cleaning a mailing list so no one is contacted twice.
- Removing repeated rows after combining multiple exports.
- Ensuring accurate counts and totals before analysis.
- Deduplicating records before importing them into a CRM or database.
Frequently asked questions
How does it decide what counts as a duplicate?
Rows are compared either across all columns or across the specific columns you choose as the key. Matching rows are treated as duplicates, and one copy is kept.
Can I dedupe on just one column, like email?
Yes. Choosing a key column such as email treats rows with the same email as duplicates, even if other fields differ.
Which copy is kept?
One instance of each unique record is retained so your data stays complete while the redundant copies are removed.
Is my data uploaded anywhere?
No. Deduplication happens in your browser, so your data never leaves your device.
Will it tell me how many were removed?
Yes. The tool reports how many duplicate rows were found and removed so you can verify the cleanup.