kdpcover.pro

KDP Cover Calculator

Spine width and KDP cover dimensions in a one-click popup.

The extension is in review with the Chrome Web Store. The web calculator does everything the extension will — and works offline once installed as a PWA.

Open the web calculator →

Get notified when KDP changes a spec

Email-only alerts when Amazon updates a multiplier, bleed, hinge, or barcode rule. No newsletter, no marketing — typically 1–3 emails a year.

Your email is stored in our email provider (Resend) and used only for KDP-spec notifications. Unsubscribe in one click from any email we send.