Remove Duplicate Lines
Delete repeated lines from a list and keep only the first occurrence of each.
- Runs in your browser
- Free to use
About this tool
Remove Duplicate Lines is the quickest way to deduplicate addresses, domains, e-mails or any list: duplicates are removed while the original order is kept, and the counts of input, unique and removed lines are displayed. Case and whitespace differences can be ignored so "Admin@Example.com " and "admin@example.com" count as one.
Follow with Sort Text Lines for a clean, ordered list.
How to use it — quick steps
- 01
Enter the lines
Type or paste the lines in the field above, one item per line. Use Ctrl + V to paste from the clipboard.
- 02
Adjust the options
Pick the settings that fit your case; the defaults work for most people. Changes apply instantly.
- 03
Press "Remove duplicates"
Press "Remove duplicates" or Ctrl + Enter. The result appears instantly below the form.
Key features of this tool
Nothing leaves your browser
The processing is plain JavaScript that runs on your device: the text you paste is never uploaded to our servers or to anyone else.
Instant results
Results appear the moment you press the button, even for long inputs, and every block has copy and download actions.
Works everywhere
No installation, no account and no limits: the tool works on desktop and mobile, in any modern browser, as often as you like.
Frequently asked questions
Which copy is kept?
The first occurrence; the original order of the remaining lines is preserved.
Can I see the duplicates instead?
Compare the input with the output using Compare Two Lists to list what was removed.
Are my files or data uploaded?
No. The tool is plain JavaScript that runs in your browser; the files or data you provide here are never uploaded to our servers.