KDP Cover FAQ

Spine width depends on your page count and paper type. The formula is: for white paper, multiply your page count by 0.002252 inches; for cream paper, multiply by 0.0025 inches. For example, a 200-page book on white paper has a spine of approximately 0.450 inches. Our free spine calculator does this math instantly.

Bleed is 0.125 inches (3.2mm) of extra image space beyond the trim line on all four sides of your cover. All KDP covers require bleed. This extra space ensures that when the book is trimmed during manufacturing, there are no white edges. Any background images or colors should extend into the bleed area, but important text and elements should stay inside the safe zone (0.25 inches from the trim edge).

Yes, but only if your book has 79 or more pages. Below 79 pages, the spine is too narrow for text and KDP recommends leaving it as a plain color. When you do add spine text, keep it centered within the spine safe zone to prevent it from wrapping onto the front or back cover during printing. KDP CoverLab Pro automatically shows spine text controls when your page count qualifies.

KDP offers 14 standard paperback trim sizes. The most popular is 6 × 9 inches, which works for most fiction and non-fiction. Other common sizes include 5 × 8 (compact novels), 5.5 × 8.5 (memoir), 8.5 × 11 (workbooks and coloring books), and 8 × 10 (children's books). For hardcover (case laminate), KDP supports a subset of 8 trim sizes: 5.5×8.5, 6×9, 6.14×9.21, 6.69×9.61, 7×10, 7.44×9.69, 7.5×9.25, and 8.5×11. See our complete KDP size guide for all options with recommended uses.

The most common rejection reasons are: incorrect overall dimensions (width and height don't match the required cover size), resolution below 300 DPI, text or critical elements placed inside the bleed zone or too close to the trim line, incorrect spine width calculation, and missing barcode space on the back cover. KDP CoverLab Pro handles all of these automatically with its preflight checklist.

All images used in your KDP cover should be at least 300 DPI. This includes background images, author photos, and any graphics. Lower resolution images will appear blurry when printed. KDP CoverLab Pro exports at exactly 300 DPI and warns you if uploaded images are too small for the cover dimensions.

The safe zone is 0.25 inches (6.4mm) inside the trim line on all sides. Any text, logos, or important elements must stay within this zone. Content placed outside the safe zone risks being cut off during the trimming process, or may shift slightly during printing. The spine has its own safe zone to prevent spine text from wrapping onto the front or back cover.

No — if you don't include a barcode, KDP will automatically place one on the back cover during publishing. However, if you want to control its position, you can include your own. Either way, you should leave space for the barcode in the lower-right area of the back cover (approximately 2 × 1.2 inches).

Not directly. An eBook cover is a single front-only image (typically 2560 × 1600 pixels for a 1.6:1 ratio), while a paperback cover is a full wraparound that includes the back cover, spine, and front cover as one continuous image. You can use the same front cover artwork for both, but the paperback version needs the additional back and spine elements.

White paper is best for books with images, color illustrations, or a modern look. Cream (or "creme") paper is easier on the eyes for long reading sessions and is traditional for novels and literary fiction. Note that cream paper is slightly thicker, which affects spine width — a 200-page book on cream paper will have a wider spine than the same book on white paper.

KDP CoverLab Pro is built specifically for this. Upload your front cover image (or use a stock photo), set your book specifications (trim size, page count, paper type), and the app automatically calculates all dimensions, creates the spine, and lets you add text and a back cover. Export a print-ready PDF and upload directly to KDP. No design software or technical knowledge required.

You can design and preview your cover for free. Exporting print-ready files requires credits — either a one-time purchase of 10 exports for $4.99, a monthly subscription for $9.99/month with unlimited exports, or an annual plan at $59.99/year (50% savings). There's no commitment and you can cancel anytime.

KDP CoverLab Pro uses Amazon's exact spine formulas and enforces proper bleed (0.125"), safe zones, and 300 DPI resolution. The built-in preflight checklist verifies every requirement before you export. Covers created with correct specifications pass Amazon's automated review on the first submission.

Yes. KDP CoverLab Pro includes full hardcover (case laminate) support. When you select "Hardcover" in the binding type dropdown, the canvas automatically adjusts to include the 0.625-inch board wrap (overhang) on all edges and 0.375-inch hinge channels between each board and the spine. The app shows color-coded guides for the wrap zone, hinge channels, trim lines, and safe zones. Hardcover covers use the same spine formula as paperback but only support white paper and a subset of 8 trim sizes. The preflight checklist and export dimensions update automatically for the selected binding type.

A paperback cover file consists of back cover + spine + front cover with 0.125-inch bleed on the outer edges. A hardcover (case laminate) cover adds additional elements: a 0.625-inch wrap area around all four outer edges (this wraps around the board), and 0.375-inch hinge channels on either side of the spine (where the cover bends open). This makes the total file dimensions significantly larger than a paperback cover for the same trim size. KDP CoverLab Pro calculates all of these dimensions automatically when you switch to hardcover mode.