--- title: "KDP fill-in maker: generate once, export every trim" description: "Generate a whole fill-in book from a themed word bank, then export every KDP trim at 300 DPI. Unlock a project once for $4.99 and re-export forever." source: "https://www.oncebooks.com/kdp-fill-in-maker" --- Publisher Studio # The KDP fill-in maker Generate a whole graded fill-in book from a themed word bank, then export it at every KDP trim, print-ready at 300 DPI. Make one puzzle free in your browser, unlock a full project for a one-time fee, and export unlimited formats forever. [Open Publisher Studio](https://app.oncebooks.com/publisher-studio/fill-in)[Make one free first](https://www.oncebooks.com/tools/fill-in-generator) $4.99 once per project. Unlimited exports, every trim. No subscription. ## Every puzzle fits one way The studio lays your word bank into a criss-cross skeleton and proves no other arrangement fits. The filled grid prints as the answer key, so nothing in the book is ambiguous. ## Every KDP trim, 300 DPI Pick any of KDP's 17 trim sizes, from 5.06 by 7.81 up to 8.27 by 11.69, with correct margins and gutter. The single interior file you upload passes KDP review. ## Generate once, export forever One project unlocks for $4.99. After that, re-export any trim, any time. No monthly subscription and nothing to cancel. ## How it works 1. Try a free puzzle. Use the free generator in your browser to make one fill-in and its answer, so you can see the output before you commit. 2. Draft a themed word bank. In Publisher Studio, give the book a theme and the studio drafts a word bank you curate. The puzzles are built from it. 3. Pick a difficulty curve and trim. Choose how many puzzles at each grade, then a trim size. The interior is sized with the right margins and gutter so it passes KDP review. 4. Unlock once, export any size. Unlock the project for $4.99, then export the print-ready interior and solutions PDFs at any trim, as often as you like. ## Free tool or full studio The [free generator](https://www.oncebooks.com/tools/fill-in-generator) makes one printable puzzle to try the engine. Publisher Studio is where you make a book to sell. | Free generator | Publisher Studio | | --- | --- | | One puzzle and one answer page | Hundreds of graded puzzles with a solutions section | | A built-in word list | Your own themed word bank, drafted and curated | | Large print only, printed from the browser | Every KDP trim, 300 DPI, print-ready PDFs | | Nothing is saved once you close the tab | A durable project, re-export any size forever ($4.99) | ## One price, per project $4.99 Paid once. Export unlimited formats, forever. - Print-ready 300 DPI interior PDF - Separate solutions PDF - Every KDP trim size and format - Re-export any size, any time [Open Publisher Studio](https://app.oncebooks.com/publisher-studio/fill-in) [Comparison Once Books vs Book Bolt A purpose-built puzzle-book maker you pay for once, versus an all-in-one KDP suite on a subscription.](https://www.oncebooks.com/compare/book-bolt) ## Questions **How much does it cost?** A project unlocks for $4.99, paid once. After that you can export the interior and solutions PDFs at any KDP trim, as many formats as you like, forever. There is no subscription. **What do I get when I export?** One print-ready 300 DPI interior PDF, with the filled answers at the back, sized for the KDP trim you choose. That interior is the single file you upload to KDP. You also get a separate solutions PDF. **Are the puzzles guaranteed to fit one way?** Yes. Every puzzle is generated and checked so the word bank fits the grid exactly one way before it enters the book. The printed answer matches every puzzle. **Can I try it before I pay?** Yes. The free fill-in generator makes a real 2-page puzzle in your browser with no sign-up. The unlock is only for a full multi-puzzle project you plan to publish. **Can I sell the books I make?** Yes. The exported interiors are yours to publish and sell on Amazon KDP or print yourself. The per-project unlock covers unlimited exports of that project.