Duplicate Line Remover

How to use Duplicate Line Remover

1. Paste your list of text, one item per line.
2. Optionally enable "ignore case" or "trim whitespace" to catch near-duplicates.
3. Copy or download the cleaned-up list with duplicates removed.

Frequently asked questions

Does this keep the first or last occurrence of a duplicate?
The first occurrence of each line is kept, and any later repeats are removed — the order of your remaining unique lines is preserved.

What does "ignore case" do?
With it enabled, "Email" and "email" are treated as duplicates. Without it, they're treated as two different lines since the capitalization differs.

Can this handle very large lists?
Yes, it comfortably handles lists of thousands of lines since the comparison runs locally in your browser rather than over a network.