CSV Deduplicator

Upload your CSV using the tool above, choose whether to check all columns or just specific ones, then click Run. A clean deduplicated file downloads automatically — no account or software required.

Yes. Enter the column names you want to check in the 'Columns to check' field, separated by commas (e.g. email, phone). Leave it blank to check all columns — only rows identical across every column will be removed.

By default the first occurrence of each duplicate is kept and later ones are removed. Switch to 'Keep last' to keep the most recent occurrence instead — useful when your CSV is sorted by date and newer records should win.

The free tier supports files up to 10 MB and 100,000 rows. This covers most real-world datasets. The original column order and formatting are preserved in the output.