Remove Duplicate Lines
Delete duplicate lines from any list or text instantly.
🔒 100% browser-based — your data never leaves your device.
About this tool
Paste a list — emails, keywords, URLs, product codes, anything with one item per line — and this tool removes every duplicate line while keeping the original order of first appearance. Optional switches let you ignore upper/lower case differences, trim surrounding whitespace before comparing, and sort the result alphabetically.
It is a quick way to deduplicate keyword lists for ads, clean mailing lists, or tidy data exported from spreadsheets, all without installing anything.
Frequently asked questions
Which duplicate is kept?
The first occurrence of each line is kept and later repeats are removed, so the original order is preserved unless you enable sorting.
What does "ignore case" do?
With ignore case enabled, Apple and apple are treated as the same line and only the first one is kept.
Is there a size limit?
No hard limit — lists with hundreds of thousands of lines process in under a second because everything runs locally in your browser.