Duplicate Line Remover
Paste a list with one item per line and get back a clean, deduplicated list — choose how matches are compared and which occurrence to keep.
Overview
Lists pasted from spreadsheets, CRMs, or scraped data often carry duplicate lines — the same email address, keyword, or URL appearing more than once, sometimes with different casing or trailing whitespace. This tool removes duplicates in one pass, with options for case-insensitive comparison, whitespace trimming, blank-line handling, and whether to keep the first or last occurrence of a repeated line.
Examples
Removing repeated lines
apple banana apple cherry banana
apple banana cherry
How It Works
- Paste your list, one item per line, into the box.
- Choose comparison options — case-insensitive matching, whitespace trimming, ignoring blank lines, and first-vs-last occurrence.
- Click Remove Duplicates to get a clean list, ready to copy.
FAQ
No. Deduplication happens entirely in your browser using JavaScript — nothing you paste is transmitted anywhere.
Yes. The output keeps lines in their original order, keeping either the first or last occurrence of each duplicate depending on the option you choose.
Yes, if you enable case-insensitive comparison. By default, comparison is case-sensitive, so differently-cased lines are treated as distinct.
By default they're kept as-is. Enable "Ignore blank lines" to strip them from the output entirely.