Free Tools for KDP and
Print-on-Demand Sellers
8 puzzle and worksheet generators, a library of printable puzzles, a Redbubble tag generator and 7 KDP calculators. Each one opens straight in your browser — no sign-up, no card, no download.
Puzzle and worksheet generators
Each generator makes one puzzle or worksheet at a time, with its answers, for printing at home, in a classroom, or as a test page before you plan a book.
- Word Search GeneratorPick a theme or paste your own word list (a spelling list works), choose the grid size, reveal the answers and download the puzzle as a PNG.
- Maze GeneratorA new maze on every press, in easy, medium or hard. Show the solution path and download a PNG.
- Sudoku GeneratorA fresh 9 × 9 sudoku at easy, medium or hard, with the answers one toggle away. Print it straight from the page.
- Crossword GeneratorA clued crossword built from a themed word bank, with an answer key, ready to print.
- Word Scramble GeneratorJumbled-word puzzles from a themed word list, with the unscrambled answers for checking.
- Number Fill Puzzle GeneratorA number-fill (Latin square) puzzle: every row and column holds each number once. Gentler than sudoku, and it prints with its solution.
- Connect the Dots GeneratorPick a theme and difficulty and get a numbered dot-to-dot picture with a matching solution, downloadable as a PNG.
- Math Worksheet GeneratorMultiplication, addition, subtraction, division or mixed. Choose the difficulty and number of problems, show or hide answers, then print or save as PDF.
Printable puzzles
Ready-made sheets when you would rather print than generate: themed word searches, crosswords and word scrambles, plus a sudoku sheet for kids. For mazes and sudoku at every difficulty, use the generators above.
- All printable puzzlesThemed word search, crossword and word scramble sheets, plus a kids' sudoku sheet, each with an answer key.
- Sudoku for kidsTwo large, easy sudoku grids to a sheet with plenty of given numbers, answers included.
- Animals word searchA themed word search sheet in three grid sizes, with the full word list and an answer key.
- Christmas crosswordA Christmas crossword with written clues in three grid sizes. Print it, then turn answers on and print again for the key.
Listing tools for print-on-demand
For Redbubble sellers who want every tag slot used without guessing.
KDP and Audible calculators
Built on the rate tables Amazon publishes in its own KDP and ACX help pages. Each one answers a different question — what you are paid, what printing costs, what a sales rank means.
- KDP Royalty CalculatorWhat Amazon pays you per paperback, with the 50% / 60% royalty band and the minimum list price.
- KDP Printing Cost CalculatorWhat one paperback costs to print — black ink or colour — and the total for an author-copy order.
- Kindle eBook Royalty CalculatorThe 70% and 35% options, with the file-size delivery fee taken off.
- KENP Royalty CalculatorWhat Kindle Unlimited pages read are worth at a KENP rate you set.
- Book Sales CalculatorTurns an Amazon Best Sellers Rank into estimated daily and monthly sales.
- Audiobook Royalty CalculatorACX royalty per sale on the new and the legacy royalty models.
- Audible Sales CalculatorTurns an Audible Best Sellers Rank into estimated audiobook sales.
When you need more than one page
The tools above are free for good. Octozia’s paid apps are separate: there is no free plan for them, only a 3-day free trial that needs a card to start.
- KDP Creator — builds whole puzzle and activity book interiors (sudoku, word search, mazes, math, crossword, number fill, word scramble) with solution pages, as 300-DPI page images.
- Redbubble Uploader and TeePublic Uploader — Chrome extensions that fill in titles, tags and descriptions and publish designs in bulk.
Compare everything on the tools page or see pricing.
Questions about the free tools
Do I need an account to use these tools?▾
No. Every tool on this page runs in your browser with no account, no email and nothing to install. Open it, make the puzzle, worksheet, tag list or calculation, then print or download it.
How are these different from Octozia's paid apps?▾
The free generators make one puzzle or worksheet at a time. KDP Creator, the paid app, builds whole book interiors — many pages at once with solution pages — as 300-DPI page images. The Redbubble and TeePublic uploaders are paid Chrome extensions that fill in and publish listings in bulk.
Is there a free plan for the paid apps?▾
No. The paid apps can be tried on a 3-day free trial that needs a card to start. You are not charged if you cancel before the 3 days end; after that a paid plan is required. The free tools on this page stay free and never ask for a card.
