Remove Duplicates

The Remove Duplicates tool eliminates repeated lines from any list or block of text, keeping only the first occurrence of each line. Paste the content in the text area and the filtered result appears immediately below, with a counter showing how many lines were removed.

The workflow is simple: paste the list in the input, adjust the options if needed, and copy the result. The tool offers two behavior options. "Case sensitive" treats "word" and "WORD" as distinct entries when checked, or as equal when unchecked. "Trim whitespace" strips leading and trailing spaces from each line before comparing, preventing a line with an extra space from being treated as unique.

Common use cases include cleaning email lists before a campaign, deduplicating keywords exported from SEO tools, removing repeated addresses from an import file, filtering duplicate IDs or SKUs from spreadsheets, and organizing ingredient or item lists copied from multiple sources. Any situation where you receive a list and need to ensure each item appears only once is a perfect fit.

Processing is 100% local: the text is analyzed by the browser's JavaScript engine and never reaches any server. The tool works without an internet connection after the page loads and requires no login, registration, or software installation.