Duplicate Line Remover
Paste a list to instantly remove repeated lines while keeping the original order, with optional case-insensitive and whitespace-trim matching.
Clean up any list in seconds
Duplicate lines creep into everything — exported email lists, keyword sets, CSV columns, log files, and hand-built lists that grew over time. This tool removes them instantly: paste your text, and it keeps the first appearance of each line while dropping every later repeat, preserving the order you already have.
The matching options handle the messy cases. Turn on case-insensitive to treat different capitalizations as the same entry, trim whitespace so trailing spaces don't hide duplicates, and optionally strip blank lines while you're at it. The result panel is ready to copy, and it tells you exactly how many duplicates were removed.
Private by design
Everything runs locally in your browser, so it's safe for lists you wouldn't paste into an unknown website — no uploads, no storage, no accounts.
Frequently Asked Questions
What does the duplicate line remover do?
It scans your text line by line and keeps only the first occurrence of each line, deleting any later repeats. It reports how many duplicate lines were removed.
Can it ignore case and whitespace?
Yes. Toggle “case-insensitive” to treat Apple and apple as the same, and “trim whitespace” to ignore leading and trailing spaces when comparing lines.
Does it keep the original order?
Yes. Lines stay in their original order; only later duplicates are dropped. You can also remove blank lines with the extra option.
Is my text uploaded anywhere?
No. All processing happens in your browser. Nothing is sent to a server or stored.
More free text and data utilities for developers and marketers.