I run BulkTextKit — 15 free text tools that run 100% in the browser (no uploads, no sign-up). Last week someone wrote in with a list problem I hadn't thought about properly.

The usual 'remove duplicate lines' keeps ONE copy of each repeated line. But this person needed the opposite: if a line appears more than once, delete EVERY copy — because in their list, a repeated entry meant bad data on both entries, not one good + one spare.

So 'Remove ALL copies of repeated lines' is now a tool of its own. Paste the list, click once, and only the true one-offs survive. Like everything on the site it runs locally in your browser — your text never leaves the page, which matters when the list is customer emails or order IDs.

It sits next to the classic remove-duplicates, plus case fixing, sorting, find-and-replace, word counting and a handful of other paste-clean-paste tools.…