Remove Duplicate Lines
Text toolNewRemove duplicate lines and keep your text unique.
This tool runs entirely in your browser. Your files never leave your device — nothing is uploaded.
Paste some text above to remove duplicate lines.
Frequently asked questions
Does this tool upload my text to a server?
No. Remove Duplicate Lines runs entirely in your browser using JavaScript — your text never leaves your device and nothing is uploaded or stored. That makes it safe for sensitive lists like emails, logs or private notes.
Which line is kept when there are duplicates?
The first occurrence of each line is always kept in its original position, and any later copies are removed. This preserves the order of your list while stripping out repeats.
What do the case-insensitive and trim options do?
Case-insensitive treats lines like "Apple" and "apple" as the same so only one is kept. Trim removes leading and trailing spaces before comparing, so " item" and "item" count as duplicates. You can combine both for the loosest matching.