Text Tools

How to Use Remove Duplicate Lines

2026-11-124 min readBy Apex Tool Station Team

Delete duplicate lines from a list while keeping the original order. Optional case-insensitive and trim.

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1. What is Remove Duplicate Lines?

Clean up email lists, keyword lists, URLs or any data by removing repeated lines. The first occurrence of each line is kept and the original order is preserved.

2. How to use Remove Duplicate Lines

Here is the whole process, step by step. It takes less than a minute from opening the tool to seeing your result.

1Fill in the Your text field.
2Copy or download your result with the buttons under the output.

Your result updates as you type — there is nothing to press and nothing to wait for.

Everything runs in your browser — your files and text never leave your device.

3. What you can do with it

Save your result with the "Copy result", "Download .txt" buttons under the tool.
Start over any time with the "Clear" button — it clears the tool so you can begin again.

4. Tips for best results

Your text never leaves your device — The tool runs entirely in your browser using JavaScript. Nothing is uploaded, so you can paste private documents without worry. That also means there is no account to create and no file to upload.
It works on your phone too — Open the tool in any modern browser on Android or iPhone. The layout adjusts to the screen and everything works the same way on a small screen as on a desktop.
Save your result before you leave — Use the "Copy result" button to keep a copy. If you are starting a new piece, use "Clear" first so old text does not mix into the new result.