CSV Deduplicator
Remove duplicate rows from CSV files online for free. Deduplicate by all columns or a specific key column. Download clean CSV instantly.
About CSV Deduplicator
Paste your CSV data and remove duplicate rows in one click. Choose to deduplicate by the entire row (all columns must match) or by a single key column such as email or ID. The tool shows exactly which rows were removed and lets you download the cleaned CSV. No file upload needed — everything runs in your browser.
remove duplicates csvcsv duplicate removerdelete duplicate rows csvcsv deduplicator onlineremove duplicate csv rowsclean csv duplicatescsv unique rowsdeduplicate csv online free
Your privacy is built in
Everything in CSV Deduplicator runs locally in your browser — your data never leaves your device and is never uploaded to a server, so nothing you enter is stored or seen by anyone else. No account, no sign-up, no watermark, and completely free.
Frequently asked questions
Can I deduplicate by a specific column?
Yes — select any column (e.g. email or ID) as the key, and rows with duplicate values in that column will be removed.
Which duplicate is kept — the first or last?
The first occurrence is kept; all subsequent duplicates are removed.