Duplicate Line Remover
Paste a list — emails, URLs, keywords, code — and remove every repeated line while keeping the original order.
Typical uses
Cleaning email lists before a campaign, deduplicating keyword exports from SEO tools, merging customer ID lists from two sources, tidying up a .env file, or normalizing log data. The tool keeps the first occurrence of each line and preserves the original order — most spreadsheets can't do both at once.
Frequently asked questions
Does the comparison use the trimmed value?
When “Ignore leading/trailing spaces” is on, lines are compared after trimming, and the trimmed version is what you get in the output — so “ apple ” and “apple” collapse into one clean “apple”.
Is my data uploaded?
No. The deduplication runs in your browser. Email lists and customer data never leave your device.