Does case matter when finding duplicates?

By default, yes, "Apple" and "apple" are treated as different lines. Turn off the "Case-sensitive" toggle to treat them as duplicates of each other.

Can I also sort the cleaned list?

Yes. Enable "Sort output A–Z" and the unique lines are alphabetically sorted while duplicates are still removed.

Yes. Deduplication happens entirely in your browser. Nothing you paste is sent to any server or stored anywhere.

Remove Duplicate Lines

Delete repeated lines instantly, live.

Your text (0 lines)

Unique lines (0 lines)

Case-sensitiveIgnore empty linesSort output A–Z

Processed instantly in your browser. Nothing is sent or stored anywhere.

About this tool

Duplicate lines creep into email lists, keyword research, log files, and keyword CSVs all the time, and cleaning them by hand is slow and error-prone. This free duplicate line remover does it instantly: paste your text, and every repeated line is stripped the moment you paste it, with a live count of exactly how many lines were removed.

Three practical options cover the edge cases that simpler tools miss. Case-sensitive mode (on by default) keeps "Apple" and "apple" distinct; turning it off merges them. The ignore-empty-lines toggle drops blank lines along with duplicates, and the A–Z sort option returns a tidy alphabetized list. The first occurrence of each line is always the one kept, so your original order is preserved unless you choose to sort.

How to use the remove duplicate lines

1Paste your text into the left box, one item per line.
2Duplicates are removed automatically as you type or paste.
3Toggle case sensitivity, empty-line handling, or A–Z sorting to refine the result.
4Click "Copy result" to copy the cleaned list, or "Clear" to start over.

Good to know

Because everything runs locally in your browser, there's no upload step and no privacy concern, even sensitive lists like email addresses or internal data never leave your device. It's a fast, free, honest utility for marketers cleaning keyword lists, developers deduplicating logs, and anyone tidying a text file.

Frequently asked questions

Any line that has already appeared earlier in the text. Only the first occurrence is kept; later repeats are removed, and the tool shows exactly how many lines were removed.

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