Remove Duplicate Lines
Remove repeated lines while keeping the first occurrence.
How to remove duplicate lines
Paste your list and the tool removes repeated lines, leaving one of each, with options to ignore case or trim spaces. It's perfect for cleaning up email lists, keyword lists, CSV columns and any text where duplicates have crept in. You get a deduplicated result you can copy back in seconds.
Why deduplicate a list?
Duplicate entries inflate counts, skew data and cause errors when you import a list into another tool or system. Removing them gives you a clean, accurate set without scrolling through to find repeats by hand. The processing happens in your browser, so your list stays private on your device.
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Frequently Asked Questions
Does it keep line order?
Yes. It keeps the first occurrence of each line and removes later duplicates.
Are blank lines removed?
Blank lines are treated like any other line, so repeated blank lines are reduced to one.
Is duplicate removal case sensitive?
Yes. Lines that differ only in capitalization are treated as different and both are kept.
Is my text uploaded?
No. Duplicate lines are removed locally in your browser, so your text stays private.