KDP Keyword Slot BuilderFree

How it works. Your ideas are cleaned (lowercase, extra spaces, double quotes and HTML removed, exact duplicates dropped), then packed into 7 boxes with a first-fit-decreasing method: longest phrases first, each into the first box that still has room, words separated by spaces. Warnings follow KDP's keyword guidance: don't repeat the title or contributors, skip subjective claims ("best novel ever"), time-sensitive words ("new", "on sale", "available now"), common words like "book", spelling or plural variants, other authors' names, brands you don't own, quotation marks and Amazon program names such as Kindle Unlimited and KDP Select. Words like "free" or "bestseller" are flagged as risky promotional claims; KDP's page doesn't name them, but they fall under its subjective and misleading-metadata rules. This tool can't spot other authors' names or brands, so check those yourself. Everything stays in your browser.