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Open →HomeToolsRemove Duplicate Lines
Remove Duplicate Lines
Paste your list, click the button, get a clean list with every duplicate line removed — first copy kept, order preserved.
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Duplicates removed
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100% free · No signup · Your text never leaves your browser.
What does remove duplicate lines do?
It takes a list — one item per line — and deletes every line that appears more than once, keeping the first copy and the original order. Email lists, keyword lists, inventories and data exports all collect duplicates over time; this tool cleans them in one click, entirely in your browser.
How to use the duplicate line remover
- Step 1: Paste your list into the box — one item per line.
- Step 2: Choose your options: ignore case, ignore stray spaces, or drop empty lines entirely.
- Step 3: Click Remove duplicates and copy the cleaned list.
Options explained
- Ignore letter case — treats 'Apple' and 'apple' as the same line.
- Ignore spaces at line ends — lines that differ only by trailing spaces or tabs count as duplicates (the usual cause of 'invisible' duplicates from spreadsheets).
- Remove empty lines — drops blank lines from the result instead of keeping one.
Private by design
Lists often contain emails or customer data, so they should never be uploaded to a random website. Everything here runs in your browser with plain JavaScript — your text never leaves your device.
Frequently asked questions
Is this duplicate remover free?
Yes — completely free, no signup and no limit on list size.
Does it keep the original order?
Yes — the first copy of each line stays exactly where it was; later copies are removed.
Why do some duplicates survive?
Usually invisible characters: trailing spaces or different letter case. Turn on both ignore options and run it again.
Can it remove duplicate words inside a sentence?
No — it works line by line. For word-level analysis, try the word frequency counter.
Is my list uploaded anywhere?
No. Everything happens in your browser; your text never leaves your device.
Short answer: It takes a list — one item per line — and deletes every line that appears more than once, keeping the first copy and the original order. Email lists, keyword lists, inventories and data exports all collect duplicates over time; this tool cleans them in one click, entirely in your browser.
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