The Remove Duplicate Lines tool strips repeated lines out of any text or list, keeping only the first occurrence of each. Paste a list, log, set of emails, or any line-based data and get a clean, de-duplicated result in one step.
Options let you ignore case, trim whitespace from each line before comparing, and drop empty lines, so “Apple”, “apple ”, and “apple” can all count as the same entry. Everything runs in your browser, so your data stays private.
How to remove duplicate lines
- Paste your text or list into the input box.
- Choose whether to ignore case, trim lines, and remove empty lines.
- The de-duplicated result and the number removed appear instantly.
- Copy the cleaned output.
How duplicates are matched
Lines are compared exactly by default, so only identical lines are treated as duplicates. Turn on “Ignore case” to match regardless of capitalisation, and “Trim each line” to ignore leading and trailing spaces — useful when data has been copied from different sources with inconsistent spacing. The first time a line appears it is kept; every later repeat is removed, so the original order of your unique lines is preserved.
Common uses
This is handy for cleaning up mailing lists and removing repeat email addresses, de-duplicating exported data, tidying keyword lists for SEO, merging lists from several sources, or cleaning log files. Because it keeps the first occurrence and preserves order, you can safely run it on lists where sequence matters.
Frequently Asked Questions
How do I remove duplicate lines from a list?
Paste the list, and the tool keeps the first of each line and removes the rest. Use the options to ignore case or trim spaces if needed.
Does it keep the original order?
Yes. It preserves the order of the first occurrence of each unique line, rather than sorting them.
Can it treat “Apple” and “apple” as the same?
Yes — enable “Ignore case” and lines that differ only in capitalisation are treated as duplicates.
Is my data private?
Yes. Everything runs in your browser, so your text is never uploaded.