Long lists — email addresses, URLs, log lines, names — tend to pick up duplicates from copy-pasting or merging sources. Paste your list here and this tool strips out every repeated line while keeping the first occurrence and the original order, entirely in your browser.
How to use the remove duplicate lines tool
- 1
Paste your list
Add text with one item per line — emails, URLs, names, anything.
- 2
Adjust the options
Toggle case-insensitive matching and whitespace trimming if needed.
- 3
Copy or download
Grab the deduplicated list, with only the first occurrence of each line kept.
Common use cases
Clean an email list
Remove repeated addresses before importing a list into a mailing tool.
Tidy exported data
Strip duplicate rows copied from a spreadsheet or database export.
Merge two lists
Combine two lists and keep only the unique lines across both.
Frequently asked questions
The first one — later duplicates further down the list are removed.