Paste any list and remove duplicate lines instantly. Choose whether comparison is case-sensitive, trim whitespace, sort results, and remove blank lines. All processing is done locally — nothing is sent to a server.
The Duplicate Line Remover takes any list or block of text, finds repeated lines, and gives you back a clean, deduplicated version in a single click — with live counts showing exactly how many duplicates were stripped out.
Messy lists pile up everywhere: exported email addresses, log files, keyword research, CSV columns pasted line by line, or notes you have copied together from several places. Doing the cleanup by hand is slow and error-prone, especially once a list runs to hundreds or thousands of entries. This tool compares every line against the ones above it and keeps only the first appearance of each, so the result stays in a predictable order. You stay in control of how matching works: trim whitespace so leading and trailing spaces do not hide otherwise-identical lines, switch comparison to case sensitive when "Apple" and "apple" should count as different, sort the result A to Z or Z to A, and drop blank lines entirely. The input and output sit side by side, the counters update as you type, and a single button copies the cleaned list to your clipboard. People use it to:
Everything happens locally in your browser, so nothing you paste is ever uploaded or stored on a server. That keeps the tool fast even on large lists and safe for private data such as customer emails, access keys, or internal records — the text never leaves your device.
Yes by default — the first occurrence of each line is kept and subsequent duplicates are removed. Turn on Sort to reorder alphabetically instead.
No by default — "Apple" and "apple" are treated as duplicates. Toggle Case sensitive to make them distinct.
No. All processing runs locally in your browser, so it's safe for email lists, keys, and other private data.
By default the comparison ignores letter case, so "Apple", "APPLE", and "apple" are treated as the same line and collapsed into one. Turn on the Case sensitive option to compare lines exactly as typed, which keeps differently-cased versions as separate entries.
Yes. Enable Sort A → Z to order the cleaned result alphabetically, or Sort Z → A for the reverse. The two sort options are mutually exclusive, so turning one on switches the other off. Leave both off to keep lines in their original order.
The first occurrence of each line is always the one kept, and every later repeat is removed. Because the tool scans from top to bottom, the original order of your list is preserved unless you turn on one of the sort options.
The Trim whitespace option is on by default and removes leading and trailing spaces before comparing, so lines that differ only by stray spaces still count as duplicates. Switch on Remove blank lines to also drop empty lines from the output entirely.