COVERSPEC · PROFESSIONAL BROWSER TOOL
Size a cover for your book.
Pick a real publishing scenario to see KDP paperback spine, bleed, and full-cover dimensions instantly—then generate a printable spec sheet.
01 · WORKBENCH
Inputs and files stay on this device
Processed locally
/Focus first input⌘ ↵Run primary action⌘ ⇧ SDownload local reportAlt RJump to latest resultsAlt LSwitch languageAlt TSwitch themeAlt CToggle high contrast
Local report studioPreview · Markdown · JSON · SHA-256
SHA-256
—Uses only the currently visible result summary, never input controls or original files; the fingerprint is also calculated locally.
Local analysis checkpointsUp to 5 · saved only when you choose
Stores only the visible result summary, time, and an optional short label; imported files and input controls are never stored. Imports must match this tool and stay under 128KB; comparison also stays on this device.
02 · CAPABILITIES
Built deeply for one narrow workflow
Inches and millimeters
Diagram and spec sheet
Formulas and spine factors follow KDP's current public help. Always verify current requirements with KDP's official calculator before upload.
Read the source ↗NO ACCOUNT · LOCAL PROCESSING · EXPORTABLE