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📐 Spine Calculator 📏 Cover Size Guide 🔍 Keyword Research 🛠️ Cover Rejected? 8 Fixes 💰 Royalty Calculator
Built for self-publishers

Stop getting KDP rejections on your book covers

CoverLab Pro automatically calculates your exact spine width, trim size, and bleed — so your paperback, hardcover, and eBook covers pass Amazon's checks the first time.

Already rejected? Fix yours in 5 minutes →

✓ No design skills needed ✓ Works in browser ✓ Instant access
FICTION
Your
Book
Title
Author Name
Your Book Title
Your synopsis and book description will appear here on the back cover.
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300DPI Export
14Trim Sizes
4EXPORT FORMATS

What Authors Are Saying

★★★★★

"I spent two days trying to get my cover dimensions right in Canva. This tool did it in 5 minutes. The spine width was exact — KDP accepted it first try."

RK
Rachel K.
Self-Published 3 Books
★★★★★

"Way cheaper than hiring a designer for my low-content books. I can knock out a cover in 10 minutes now and the 300 DPI exports look sharp in print."

DA
David A.
Activity Book Creator
★★★★★

"The back cover and spine layout is what sold me. Every other tool only does the front. This gives you the full wraparound PDF that KDP actually needs."

MT
Maria T.
Indie Fiction Author
★★★★★

"Added 30 pages to my manuscript after the cover was done. Just updated the page count and the spine recalculated instantly. New cover passed KDP review same day."

JH
James H.
Published 12 Books on KDP
★★★★★

"I needed a hardcover case laminate cover for a 6×9 trim. Most tools don't even support hardcover. This one calculated the hinge, board overhang, and spine perfectly."

SP
Sarah P.
Nonfiction Author
★★★★★

"Exported as TIFF for my print-on-demand service and PDF for KDP — both from the same design. No other cover tool I tried exports in TIFF. Huge time saver."

CN
Chris N.
Coloring Book Publisher

Free KDP Resources

📐

Spine Width Calculator

Enter your page count and paper type to get exact spine measurements for any KDP paperback or hardcover.
📏

KDP Cover Size Guide

Complete reference for all Amazon KDP paperback and hardcover trim sizes with bleed specs and paper types.
💡

Cover Design FAQ

Answers to common questions about KDP cover requirements, file formats, and design tips.
🛠️

KDP Cover Rejected? 8 Fixes

The most common reasons Amazon rejects covers and exactly how to fix each one.
🔍

KDP Keyword Research Tool

Find what readers are searching for on Amazon. Organize keywords into KDP's 7 keyword slots and export.
💰

KDP Royalty Calculator

Calculate printing costs, minimum price, and profit per sale for paperback, hardcover, and ebook.

Frequently Asked Questions

❓ Do I need design experience?
No! CoverLab is built for non-designers. Upload your images, add text, and export — we handle all the technical KDP requirements automatically.
❓ Will my covers pass Amazon KDP's checks?
Yes. We use Amazon's exact spine formulas for both paperback and hardcover (case laminate) and include proper bleed/trim zones. Our exports are 300 DPI and match KDP's specifications perfectly.
❓ What file formats can I export?
You can export in PNG, PDF, JPEG, and TIFF at 300 DPI. PNG and PDF are ideal for KDP paperback and hardcover covers, while JPEG and TIFF work great for eBook covers and other platforms.
❓ Can I cancel anytime?
Absolutely. Cancel from your account settings anytime. No hidden fees or commitments.