🧹 Remove Duplicate Lines
Paste a list, get it back with duplicates removed — first occurrence kept, order preserved.
1 duplicate line removed
How the remove duplicate lines works
Each line is compared against every line seen before it; repeats are dropped and the first occurrence kept, so your original order survives. "Ignore case" treats Apple and apple as the same line; "ignore spaces" disregards invisible leading/trailing whitespace — the most common reason two identical-looking lines both survive.
Typical jobs: cleaning email lists, keyword lists, log extracts and spreadsheet columns pasted as text. For a sorted unique list, run this tool first, then the sort-lines tool — or vice versa; the result is the same set.
Frequently asked questions
Does it keep the first or last occurrence?
The first — everything after a line’s first appearance is removed, and the surviving lines keep their original order.
Why do two identical-looking lines both remain?
Almost always invisible trailing spaces or different capitalization. Enable both options and they will merge.
Can I deduplicate comma-separated values?
Put each value on its own line first — the find & replace tool converts ", " to line breaks in one step — then dedupe.
Is there a size limit?
Practically no — tens of thousands of lines process instantly, since everything runs locally in your browser.
Is my list uploaded anywhere?
No. Lists often contain emails or customer data — exactly why this tool never transmits anything.