Every tool on this page is free to use — no sign-up, no email address, no account. Each one solves one specific, real problem we kept running into ourselves while putting together author media kits: getting exact KDP cover dimensions, or drafting a first version of an author bio that doesn’t sound like everyone else’s.
Use whichever one you need today. More tools get added here as we build them — each one picked because real authors are actually searching for it, not because it seemed like a good idea in a vacuum.
KDP Spine Width & Cover Size Calculator
Enter your trim size, interior paper type, and page count, and get your exact KDP paperback spine width, full cover dimensions (with bleed), and a free downloadable 300 DPI print-ready template — in inches, millimeters, or pixels.
Open the KDP Spine Width & Cover Size Calculator →
Free Author Bio Generator
Answer a few quick questions about you and your books — genre, tone, pronouns, a credential or two — and get a short, medium, long, and social-media-ready author bio back immediately. No AI, no signup, just a solid template-based first draft you can edit from there.
Open the Free Author Bio Generator →
Word Count to Page Count Calculator
Type in your manuscript word count, pick a KDP trim size, font size, line spacing and margins, and get an estimated paperback page count along with the spine width for white and cream paper. It uses the real KDP minimum margins and spine formulas, and everything runs in your browser.
Open the Word Count to Page Count Calculator →
Want the fuller version?
These tools handle a few pieces of a much bigger job. If you want a professional bio, book details, headshot, cover image, contact info, and interview questions all laid out together in one document you can actually hand to a podcast host, blogger, or bookstore — the Author Media Kit Template pulls everything these tools help you draft into a single, ready-to-send press kit.