Duplicate Line Remover

Paste a list, get a deduplicated one. Keeps the first occurrence of every line, with options for case sensitivity, whitespace trimming and sorting - and a live count of what was removed.

Where duplicates come from

Deduplication sounds trivial until you meet the real variants: an email export where the same address appears as [email protected] and [email protected] (the case option decides whether those merge), a CSV column pasted in where trailing spaces make every row unique, and keyword exports where blank lines inflate the count. The three checkboxes exist because all three situations are common.

Order preservation matters more than it seems. Removing duplicates while keeping the first occurrence keeps a ranked keyword list ranked; the sort option is there for when alphabetical is what you actually need, such as before a diff or a version-control check-in.

Usage example

You pulled 4,800 keywords from an export tool and suspect overlaps between match types. Paste the keyword column, enable case-insensitive mode and whitespace trimming, and the counters tell you instantly whether the true unique count is 4,800 or 3,200 - the difference being either wasted bid spend or a cleaner audience list.

For comparing what changed between two versions of such a list, run both through this tool first, then use the text diff on the results - a diff of uncleaned lists drowns in duplicate noise.

Frequently asked questions

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