Clean lists • Remove duplicates

Remove Duplicate Lines

Paste text and remove duplicate lines instantly. Great for cleaning lists, tags, and data.

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Frequently Asked Questions

What does this tool do?

It removes duplicate lines from your text while keeping the first occurrence. It is ideal for cleaning lists, tags, email addresses or any line-based data.

What do the options ignore empty lines and case-insensitive mean?

Ignore empty lines skips blank lines when finding duplicates. Case-insensitive treats lines like Apple and apple as the same, so only one is kept.

Is my text uploaded anywhere?

No. All processing happens in your browser using JavaScript. Your text is not sent to a server or stored.

Can I undo the changes?

You can always keep your original text in another window or copy it before cleaning. This tool shows a separate output field so your input is preserved until you replace it.

Is this remove duplicate lines tool free?

Yes. It is completely free to use in your browser with no signup.