Remove Duplicates

Duplicate lines pile up in all kinds of everyday text work: an email list exported twice from a CRM, a log file where the same error repeats a thousand times, a spreadsheet column pasted into a text box, or a word list where you just need the unique entries. Manually scanning for repeats is slow and error-prone once a list passes a few dozen lines, and spreadsheet 'remove duplicates' features don't always work well with raw pasted text. This tool takes a block of text, compares it line by line, and strips out every repeated occurrence so only unique lines remain — instantly, without opening a spreadsheet or writing a script.

You paste or type your text into the input box, and the tool scans each line against the ones it has already seen. Two toggles control how matching works: a case-sensitive option, so 'Apple' and 'apple' can be treated as either the same line or two different lines depending on your needs, and a trim option, so lines that differ only by leading or trailing whitespace (a common artifact of copy-pasting from PDFs or emails) are still recognized as duplicates. The result is a cleaned list with the original line order preserved, ready to copy back out or paste into another tool.

This is particularly handy for deduplicating email or contact lists before a mail merge, cleaning up keyword or tag lists, thinning out repeated log lines when you're hunting for distinct error types, or checking a dataset for accidental double entries before import. Since everything runs client-side in your browser, your data never leaves your machine — there's no upload, no signup, and no size limit imposed by a server round-trip, which matters if the text you're deduplicating is sensitive, like a customer list.