Remove Duplicate Lines

No. The tool walks your list top to bottom and keeps the first copy of each line right where it originally sat. Later repeats are dropped, and everything else stays put.

Yes. Apple and apple count as two different lines, which matters for keyword lists where capitalization varies between exports. Run your text through the Case Converter first if you want case insensitive deduplication.

They're left alone. Blank and whitespace only lines are never treated as duplicates of each other, so your paragraph spacing survives the cleanup. Use the Remove Empty Lines tool afterward if you want those gaps gone too.

Yes. Copy a column from Excel or Google Sheets, paste it in, and each cell arrives as one line ready for deduplication. The repeats vanish and you can paste the cleaned column straight back.

For the comparison, yes. A line with a stray leading or trailing space counts as a duplicate of its trimmed twin, because surrounding whitespace is ignored during matching. The kept line itself stays exactly as you pasted it, spaces included.

Tens of thousands of lines are no problem. The work happens locally with a simple lookup set, so even large keyword dumps or server logs dedupe in well under a second on an ordinary laptop.

No. The page runs entirely client side and never sends your text to a server. That makes it safe for client keyword research, internal URLs, or anything else you'd rather keep private.