What the Duplicate Line Remover does
This tool scans a block of text line by line and throws out any line it has already seen, leaving you with a clean list of unique entries. It is handy for tidying email lists, keyword lists, CSV columns, log snippets, URL collections, or any pasted list where the same row sneaks in more than once. The first occurrence of each line stays put, so the order you pasted is preserved instead of being reshuffled.
How to use it
- Paste or type your list into the Input box. Each entry should sit on its own line.
- Decide whether to tick the “Trim & ignore case” checkbox. Leave it off to match lines exactly, or turn it on to treat ” Apple”, “apple” and “APPLE” as the same line.
- Watch the Output box fill in as you go. There is no button to press: the deduplicated result updates live the moment you paste or change the option.
- Press Copy to send the cleaned list to your clipboard, then paste it wherever you need it.
Why do it here
It is quick. Results appear as you type, with no waiting on a server round trip. It is private: your text is processed entirely in your browser, so nothing is uploaded and nothing is stored. And it is free, with no account and no install. That makes it a safe choice even for sensitive lists like contact exports, since the data never leaves your device.
A couple of tips
If your lines have stray spaces or mixed capitalization that you want ignored, the “Trim & ignore case” option catches duplicates that an exact match would miss. Want the result alphabetized afterward? Drop the output into the Sort Text Lines tool. And if you regularly clean huge exports across many files at once, the BulkPro desktop app from the same team is built for that kind of batch work.
Frequently asked questions
- Does it keep the original order of my lines?
- Yes. The tool keeps the first time each line appears and only drops the later copies, so your list stays in the same order you pasted it. It does not sort the results.
- What does the "Trim & ignore case" option do?
- With it on, lines are compared after trimming leading and trailing spaces and ignoring upper or lower case. So "Apple", " apple " and "APPLE" count as the same line and only the first is kept. With it off, lines must match exactly, character for character.
- Will it remove blank lines too?
- Repeated blank lines are treated like any other duplicate, so a second empty line is removed while the first is kept. If you want to clean up extra spaces inside lines as well, the Whitespace Remover tool is a good next step.
- Is there a limit on how many lines I can paste?
- There is no fixed line limit. Because everything runs in your browser, very large lists depend on your device's memory, but typical lists of thousands of lines deduplicate instantly.
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Last updated: June 15, 2026