Remove Duplicate Lines
Paste a list and this tool removes duplicate lines, leaving one copy of each unique line in its original order. It is perfect for cleaning up email lists, log files, exported spreadsheets, keyword lists or any text where the same line got pasted twice. You can choose to ignore case so Apple and apple count as the same, and trim surrounding spaces so trailing whitespace does not fool the match. The tool also reports how many lines were removed so you know exactly what happened. Nothing is uploaded. All the deduplication runs locally in your browser, which keeps even large or private lists fast and safe.
How to use Remove Duplicate Lines
- Paste your list or text with repeated lines.
- Enable case-insensitive or trim matching if needed.
- Run the dedupe to keep only unique lines.
- Copy the cleaned list.
Frequently asked questions
Which copy of a duplicate line is kept?
It keeps the first occurrence of each line and removes every later repeat, preserving the original order of unique lines.
What does the case-insensitive option change?
With case-insensitive matching on, lines that differ only in capitalization are treated as duplicates, so Apple and apple collapse to one.
Does trimming affect what counts as a duplicate?
The trim option ignores leading and trailing spaces when comparing, so two lines with the same words but different padding are treated as identical.
What is Remove Duplicate Lines?
Paste a list and this tool removes duplicate lines, leaving one copy of each unique line in its original order. It is perfect for cleaning up email lists, log files, exported spreadsheets, keyword lists or any text where the same line got pasted twice.
Is Remove Duplicate Lines free to use?
Yes. Remove Duplicate Lines is completely free, with no sign-up and no usage limits.
Does Remove Duplicate Lines work in a web browser?
Yes. Remove Duplicate Lines runs in any modern web browser. There is nothing to download or install.
Is my data private with Remove Duplicate Lines?
Yes. Remove Duplicate Lines runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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