Remove Duplicate Lines

Remove duplicate lines from any list

The Remove Duplicate Lines tool cleans a block of text by keeping only unique lines and dropping every repeat. It is perfect for deduplicating email lists, log entries, keyword lists, imports, or any pasted column of data. Optional trimming and sorting let you normalize messy input at the same time, so you end up with a clean, orderly set of lines instead of a cluttered list full of repeats.

How it works

The deduplication runs locally in your browser with JavaScript. The tool reads each line, optionally trims surrounding whitespace so near-identical lines match, then removes any line it has already seen. You can also sort the result if you want it in order. Because nothing is uploaded, you can safely process private lists, exports, or credentials-adjacent data without it leaving your device.

Practical use cases

• Deduplicate an email or subscriber list before importing it.
• Collapse repeated entries in a log or export.
• Clean a keyword or tag list down to unique values.
• Merge two lists and strip the overlap in one step.

Pair it with Sort Text Lines to order the results, Find and Replace to normalize values first, or Remove Line Breaks to reshape the text afterward.

Private by design

All processing happens in-browser, so no data is uploaded and nothing is stored. The tool is free, needs no account, and works on all modern browsers including phones. Close the tab and your list is gone.