I coded a free tool that auto-packs the 7 KDP backend boxes up to the 50-char limit without duplicating words (Looking for feedback)
>Hey everyone,
Like a lot of creators here, I got tired of manually calculating the math behind KDP's 7 background keyword slots and keeping track of the strict formatting guidelines.
As most of you know, Amazon's A9 search engine reads all 7 boxes as a single "word cloud." If you repeat words across slots (like putting "cozy mystery books" in Slot 1 and "mystery novels" in Slot 2), the system deduplicates them, completely wasting valuable indexing space. On top of that, KDP strictly cuts you off at 50 characters maximum per individual box.
I'm an independent developer and publisher, and I finally decided to build a standalone web utility to automate this exact workflow. It is completely live, 100% free, and requires zero signups, no credit cards, and no browser extensions to install:
How it works:
- Scoped Autocomplete: It queries real-time Amazon predictive search data, filtered strictly to the Books and Kindle departments.
- Alphabet Expansion Loop: It appends queries across the alphabet to extract the exact long-tail search terms active readers are typing into the search bar right now.
- The 7-Slot Packing Matrix: You simply click your favorite keywords from the compiled list, and the algorithm automatically strings them together, packing each of the 7 rows up to the 50-character limit using standard spaces (no commas) while aggressively stripping out any repeated words.
Once you're done, you can click "Copy All Slots" to move everything directly over to your KDP submission page.
Note on cross-selling (so I'm fully transparent): I originally built this as a side utility for my main site, KDP CoverLab, which features a free paperback/hardcover spine width calculator and layout guide to stop cover rejections. You don't have to use the cover tool at all to use the keyword scraper; it functions as a completely standalone, free dashboard utility.
I would love to get your feedback to refine the packing logic. Try running a query for one of your niches—let me know if it distributes your long-tail strings smoothly or if you spot any bugs!
Thanks guys, hope this saves you some upload headaches.