Remove Duplicate Lines

Duplicate lines creep into almost any list that has been copied, merged, or scraped: email lists with repeats, keyword lists, log lines, playlist entries, ID collections. This tool removes the repeats while keeping the original order — which matters whenever sequence carries meaning. Paste your lines and press Run. Comparison is done on the trimmed line, so " apple " and "apple" count as the same entry and collapse together; the first occurrence wins and the rest are dropped. Blank lines are left as-is. Everything runs locally in your browser, so the list — which may contain personal contacts or private data — never leaves the device. A typical workflow pairs this with trim-lines first (to normalize edges) and sort-lines after (if you want alphabetical output instead of first-seen order). Together they turn a messy paste into a clean, unique, ordered list in three clicks. One subtlety worth explaining to users: "first occurrence kept" means the result preserves the position of each item's debut, not the order of a sorted set. If your goal is alphabetical uniqueness, run sort-lines after dedupe. Mention this in your expanded copy so visitors choose the right combination. For AdSense, this page should read like a small how-to: when duplicates happen, why order matters, a before/after example, and a short FAQ. That is the content standard across this toolbox — genuinely useful, original pages that earn approval and traffic. Link to trim-lines and sort-lines to build topical depth.