Remove Duplicate Lines
Paste any text or list and instantly remove repeated lines, keeping only unique entries. Options for case-insensitive matching and trimming whitespace.
FAQ
Does order matter?
The first occurrence of each line is kept; subsequent duplicates are removed. Line order is otherwise preserved.
What does case-insensitive matching do?
When enabled, "Apple", "APPLE", and "apple" are all treated as the same value — only the first one encountered is kept. The original capitalisation of that first occurrence is preserved in the output.
What does "Trim whitespace" do?
It removes leading and trailing spaces from each line before comparing. So " hello" and "hello " are treated as duplicates of "hello". This is on by default because copied text often has invisible trailing spaces.
What does "Remove empty lines" do?
Any line that is completely blank (or whitespace-only, when trim is enabled) is removed from the output. Useful for cleaning up lists with blank gaps between entries.
Can I use this on a list of emails or URLs?
Yes — paste one email or URL per line, click Remove Duplicates, and you'll get a clean deduplicated list. Enable case-insensitive matching for email addresses.