How to remove duplicate lines online
- Paste your list into the input box (emails, keywords, log lines — one per line).
- Choose whether to ignore case, trim spaces, and which occurrence to keep.
- Copy the unique lines or download a
.txtfile.
Is my list uploaded?
No. Deduplication runs entirely in your browser with JavaScript. Nothing is sent to a server, so you can safely clean private lists.
When to use this tool
Clean duplicate emails before a mail merge, dedupe keyword lists, or strip repeated lines from exported CSVs and logs — without opening a spreadsheet.
More ways to dedupe
- Remove duplicate lines onlinethe browser-only line remover, explained step by step.
- Unique lines onlykeep one copy of every line and drop the rest.
- Dedupe a list onlinenames, URLs, keywords, IDs, exported dumps.
- Remove duplicate emailscase-insensitive, Gmail dot/+tag aware, flags invalid addresses.
- Compare two listsonly in A, only in B, in both, or all unique.