Remove Duplicate Lines
Remove repeated lines and keep only unique ones, preserving their original order.
0 duplicate line(s) removed · 0 kept
Keep only the unique lines
The Remove Duplicate Lines tool scans your text and keeps only the first occurrence of each line, dropping every later repeat while preserving the original order. It is ideal for cleaning up lists, log files, email addresses, keyword lists and any data where duplicates creep in.
Matching options
Turn on Trim whitespace to ignore leading and trailing spaces when comparing lines, so “ apple” and “apple” count as the same. Turn on Case-insensitive to treat “Apple” and “apple” as duplicates. The counter shows exactly how many lines were removed.
How to use the Remove Duplicate Lines
- Paste your lines. Drop your list or text, one item per line, into the input box.
- Set the options. Optionally trim whitespace or ignore letter case while matching.
- Read the unique output. Duplicates are removed and the original order is preserved.
- Copy the result. Copy the de-duplicated list wherever you need it.
Frequently asked questions
Which duplicate is kept?
The first occurrence of each line is kept; every later duplicate of it is removed.
Is the original order preserved?
Yes. Unique lines stay in the order they first appeared in your text.
What does trim whitespace do?
It ignores leading and trailing spaces when comparing lines, so otherwise-identical lines match.
Is my text uploaded?
No. Everything runs in your browser and nothing you paste is stored.