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From KDP spine calculations to ISBN barcode generation, EPUB creation, and Amazon description formatting — every tool you need to publish professionally, completely free.
Seven professional-grade tools built for children's book authors. Browser-based, instant, and designed to match the standards Amazon KDP and IngramSpark require.
Convert Word documents to reflowable EPUB or PDF to fixed-layout picture books. 100% compliant with KDP and IngramSpark specifications — free for a limited time.
The EPUB Generator handles all the complex formatting that causes upload rejections on KDP. Upload your Word doc or PDF — we convert it to a perfectly structured EPUB file that passes Amazon's review on the first attempt.
Open EPUB Generator →Technical publishing errors cost authors weeks of delays and KDP rejections. These tools eliminate the most common problems before they happen.
Here's what authors experience trying to calculate specifications, create barcodes, and format descriptions manually — versus using the right tools from the start.
| Task | Without Tools | With Kidillus Tools |
|---|---|---|
| Spine width calculation | ⚠ Error-prone manual formula | ✓ Instant & accurate |
| KDP cover dimensions | ✗ Trial and error uploads | ✓ Exact specs in seconds |
| ISBN barcode generation | ⚠ Paid third-party services | ✓ Free, 300 DPI instant |
| Amazon description HTML | ✗ Manual HTML coding | ✓ Visual editor, one click |
| EPUB file creation | ✗ Complex software required | ✓ Upload & convert |
| Page layout planning | ⚠ Pen and paper or spreadsheets | ✓ Visual drag-and-drop |
| Project cost estimation | ✗ Guesswork | ✓ Itemised cost planner |
| Illustrator brief creation | ⚠ Incomplete emails | ✓ Professional PDF brief |
| Time to complete all of the above | ✗ Days | ✓ Under 30 minutes |
The tools handle the calculations — our studio handles everything else. Custom illustration, cover design, KDP formatting, and full publishing support, all from one team.
Kidillus provides a complete suite of free, browser-based self-publishing tools for independent authors. Whether you are calculating your KDP cover dimensions for the first time or generating a professional ISBN barcode for your tenth title, these tools eliminate the most common technical errors that delay children's book publications.
Our tools cover every stage of the technical publishing workflow: planning your book layout with the Visual Paginator, calculating exact spine and cover dimensions with the Cover Calculator, creating your EPUB file with the Generator, formatting your Amazon description with the HTML Formatter, generating your ISBN barcode at 300 DPI, writing a professional illustrator brief, and building your full publishing timeline and cost estimate with the Book Planner.
All tools are built to current Amazon KDP and IngramSpark specifications and updated whenever the platforms change their requirements. No account is required, no data is stored, and every tool is completely free. For authors who want a professional team to handle illustration, design, and formatting, visit our full publishing services or Learning Hub for free guides on children's book publishing.
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