Remove Duplicate Emails
Reviewed: 18 September 2026
Paste your list, get a deduplicated list back — instantly, in your browser. One address per line. Matching is case-insensitive and ignores surrounding spaces, and the first occurrence of each address is kept. Nothing is uploaded: this tool runs entirely on your device.
This page does not send your addresses anywhere: the tool runs in your browser and nothing is stored.
How it works
Each line is trimmed and lowercased, then compared against every address before it. The first occurrence wins; later duplicates are removed. Lines that are empty or not valid addresses are reported separately and left out of the clean list.
Limits
Up to 10,000 lines and 1 MB of input per run — plenty for a mailing list segment. Need to clean a full CSV with dead domains, disposable addresses, role addresses and a report of everything removed? That is what the email list cleaner is for.