Your book's cover is the first thing readers see in search results, category lists, and recommendations. Getting the technical specifications right, file format, dimensions, resolution, and color mode, is the minimum requirement; creating a cover that competes visually in your genre is what actually drives clicks.
This guide covers every technical specification Amazon KDP requires for both ebook covers and print covers, along with the spine width calculation for paperbacks and hardcovers, and what to keep in mind when designing or commissioning a cover.
Ebook (Kindle) cover specifications
The ebook cover is a flat image file: front cover only, no spine, no back cover. It appears in Amazon search results, on your book's product page, and on readers' Kindle devices and apps.
Dimensions
| Specification | Requirement |
|---|---|
| Recommended dimensions | 2,560 pixels (height) × 1,600 pixels (width) |
| Aspect ratio | 1.6:1 (height to width) |
| Minimum height | 1,000 pixels |
| Minimum width | 625 pixels (to maintain 1.6:1 ratio) |
| Maximum dimension on either side | 10,000 pixels |
The 2,560 × 1,600 pixel recommendation ensures your cover looks sharp on high-resolution displays (retina phones, tablets, Kindle e-ink displays with high pixel density) without being unnecessarily large. Covers below the minimum dimensions are rejected; covers at significantly lower resolution than the recommendation may appear soft on newer devices.
File format and size
| Specification | Requirement |
|---|---|
| Accepted formats | JPEG (.jpg) or TIFF (.tif) |
| Color mode | RGB (not CMYK; CMYK will be rejected or converted incorrectly) |
| Maximum file size | 50 MB |
| Compression | JPEG quality setting of 80% or higher recommended |
Ebook covers must be RGB. This is the opposite of print covers, which require CMYK (see below). If your designer provides a CMYK cover, ask for an RGB version for the ebook cover upload.
What readers see
Your ebook cover thumbnail is typically displayed at roughly 100 pixels wide in search results on most devices. At this size, text smaller than the title becomes illegible, and fine details may not read clearly. This is why professional book covers prioritize a bold image or visual concept, large title text, and author name, with everything else secondary.
Zoomed-in product page views show the cover larger, at roughly 250 to 500 pixels wide depending on device. At this size, subtitle text and secondary design elements become visible.
Print cover specifications
Print covers are fundamentally different from ebook covers: they must include the front cover, spine, and back cover as a single flat file, sized exactly for your book's physical dimensions. Because the spine width depends on your final page count, print covers can only be finalized after your interior is complete.
Spine width calculation
Spine width is calculated by KDP and depends on:
- Page count: the total number of printed pages in your interior file (including blank pages)
- Paper type: white paper and cream paper have slightly different thicknesses per page
KDP provides an official spine width calculator, available in the cover upload section of your book setup. The approximate values per 100 pages:
| Paper type | Approximate spine per 100 pages |
|---|---|
| White paper (standard) | Approximately 0.225 inches per 100 pages |
| Cream paper | Approximately 0.222 inches per 100 pages |
For a 300-page book on white paper: 3 × 0.225 = approximately 0.675 inches of spine width.
For a 400-page book on cream paper: 4 × 0.222 = approximately 0.888 inches of spine width.
Always use KDP's official calculator for the exact value; the approximations above are for estimation purposes.
Full cover dimensions
The total width of the cover file is:
Total width = front cover width + spine width + back cover width
Where front and back cover widths are both equal to your chosen trim size's width dimension.
For a 6 × 9 book (6 inches wide), with a 0.675-inch spine and standard bleed:
- Front cover: 6.125 inches wide (6 inches + 0.125 inch bleed on the outer edge)
- Spine: 0.675 inches
- Back cover: 6.125 inches wide (6 inches + 0.125 inch bleed on the outer edge)
- Total width: 12.925 inches
The height of the cover is the book's trim height plus bleed on top and bottom:
- For a 9-inch height: 9 + 0.125 + 0.125 = 9.25 inches (total height including bleed)
Bleed requirements
Bleed extends the cover image beyond the trim line so that when the book is cut to its final size, there's no white edge from slight misalignment. KDP requires:
- 0.125 inches of bleed on all outer edges of the full cover (left edge of back cover, right edge of front cover, top, and bottom)
- Do not add bleed between the back cover and spine, or between the spine and front cover; these are internal divisions, not cut edges
Safe zone
The safe zone is the area where important content (title, spine text, back cover text, logos) must be kept, to avoid being obscured if the cover is trimmed slightly off-center during production:
- Keep all text and important graphic elements at least 0.125 inches inside the trim line on all edges
- KDP's cover creator and template tools show the safe zone; if designing in external software, add guidelines at the safe zone boundary
Print cover file specifications
| Specification | Requirement |
|---|---|
| File format | |
| Color mode | CMYK (not RGB; RGB covers may print with shifted colors) |
| Resolution | 300 DPI minimum; 400 DPI recommended |
| Fonts | All fonts embedded in the PDF |
| Transparency | Flatten all transparency before export |
| Bleed | 0.125 inches on all outer edges |
| Barcode area | Leave a white area on the back cover for KDP's barcode; KDP will place it automatically |
Barcode placement
For print books, KDP adds a barcode to the back cover during the printing process. You do not need to add the barcode yourself. However, you must leave a clear white area on the lower right of the back cover. The barcode area KDP needs is approximately 2 × 1.2 inches.
If your back cover design has a dark or image background, either add a white box in the barcode area or check KDP's latest guidelines for exact barcode placement requirements, which can be found in the KDP Cover Template Generator.
Hardcover cover specifications
KDP's hardcover printing uses a case-laminate binding, which has somewhat different cover specifications from paperback. Key differences:
| Element | Paperback | Hardcover |
|---|---|---|
| Spine width calculation | Based on page count × paper thickness | Similar formula, but slightly different; use KDP's hardcover calculator |
| Wrap-around for binding | Not applicable | Hardcovers include a flap area wrapped around the cover board; dimensions account for this |
| Barcode placement | Lower right, back cover | Placed by KDP; leave white area |
For hardcovers specifically, downloading KDP's hardcover cover template, which auto-calculates dimensions for your page count, is the most reliable approach.
Using KDP's cover template generator
KDP provides a free cover template generator at the book setup stage that automates the dimension calculation. To use it:
- In your book's print details setup, enter your trim size, page count, and interior type (black and white or color; paper type affects spine width slightly)
- KDP calculates the spine width and generates a downloadable template in PDF or PNG format
- The template includes guides for the front cover, spine, back cover, and bleed areas
- Use the template as a reference layer in your design software (Affinity Publisher, Photoshop, Canva, etc.) or provide it to your cover designer
The template is the most reliable way to ensure your cover dimensions are correct before spending time on the actual design. Generating it before starting the design process saves significant rework later.
File handoff checklist when working with a cover designer
If you're commissioning a cover from a freelance designer, provide them with:
- Your chosen trim size (e.g., 6 × 9 inches)
- Your exact interior page count (from your finalized interior PDF)
- Your paper type (white or cream)
- KDP's spine width from the template generator (or ask them to generate it)
- Whether you need ebook-only, print-only, or both
- Any genre-specific reference covers you want to inform the design direction
Request the following file deliverables:
- Ebook cover: JPEG or TIFF at 2,560 × 1,600 pixels, in RGB color mode, at 300 DPI or higher
- Print cover: full-wrap PDF at 300 DPI minimum, in CMYK color mode, with 0.125-inch bleed on all outer edges, and all fonts embedded
Ask the designer to confirm CMYK mode and embedded fonts before delivering, since these two requirements are the most common sources of print upload failures.
Common cover issues and how to fix them
| Issue | Likely cause | Fix |
|---|---|---|
| Cover rejected: dimensions don't match | Total width or height doesn't match trim + bleed calculation | Recalculate using KDP's cover template generator |
| Spine text not centered | Spine was estimated before final page count was known | Recalculate spine width after interior is finalized and re-export |
| Cover looks washed out in print | File was in RGB, not CMYK | Convert to CMYK before exporting the print cover PDF |
| Pixelated or blurry print result | Resolution below 300 DPI | Re-export at 300 DPI or higher |
| White edge visible in print | Bleed not included or too narrow | Ensure 0.125-inch bleed on all outer edges |
| Barcode printed over design element | Design too close to lower-right corner | Clear a 2 × 1.2 inch white area in the lower right back cover |
What makes a cover work at thumbnail size
Most readers discover your book first at thumbnail size, roughly 100 to 200 pixels wide in Amazon search results and category lists. At that size, many design decisions that look impressive at full size, intricate patterns, small supporting text, detailed background imagery, disappear or become visual noise.
Covers that perform well in thumbnail share a few characteristics:
- High contrast: the title and central visual element read clearly against the background even at small sizes
- Bold, legible title typography: title text large enough to read at 100 pixels wide; at 200 pixels, readers should also be able to read your author name
- A single clear focal point: one main image or visual concept, not several competing elements
- Genre-signal colors and style: readers scan cover thumbnails for genre cues before reading the title; dark, moody palettes signal thriller or horror; bright pastels signal cozy romance; high-saturation, dramatic compositions signal action fantasy
Zoom your cover out to thumbnail size before finalizing; this simple test reveals design issues that are invisible at full size. A cover that looks polished at full resolution but loses clarity at 100 pixels wide will underperform in Amazon search.
Designing vs. hiring for cover design
Book cover design is a specialized skill; effective covers for a given genre require familiarity with that genre's visual conventions, which are more specific than they appear. A romance cover that looks like a thriller cover loses readers before they've read a word.
Options for cover creation:
- Hire a cover designer: freelance book cover designers (available through Reedsy, 99designs, Fiverr, and independent designer websites) will produce a print-ready cover file to KDP's specifications. Rates vary widely by designer experience and project complexity.
- Use KDP's cover creator: KDP includes a free, template-based cover creator for paperbacks and hardcovers. It produces compliant files but is limited in design flexibility compared to a custom design.
- Design your own: using tools like Canva, Affinity Publisher, or Adobe InDesign, you can build a custom cover. This is most feasible if you have design experience or your genre has simpler visual conventions.
- Use a pre-made cover: pre-made cover marketplaces sell covers designed by professionals; you purchase, add your title and name, and receive print-ready files.
Frequently asked questions
Does the ebook cover need to match the print cover exactly?
Not technically, though keeping them consistent helps readers recognize your book across formats. The key practical difference is file format and color mode: the ebook cover is a JPEG or TIFF in RGB, while the print cover is a PDF in CMYK.
When should I design the print cover?
After your interior is finalized. The spine width depends on your final page count; designing the cover before the interior is done risks a spine width mismatch that requires the cover to be resized. See our KDP formatting checklist for the full sequence of steps.
Can I update my cover after publishing?
Yes. You can upload a revised cover file from your KDP dashboard at any time. Changes go live within a few hours.
How do I know if my cover will look good in thumbnail?
Save your cover at 100 pixels wide and view it; this approximates how it appears in search results. If the title isn't legible and the central visual isn't clear at that size, the design may not perform well in search.
The bottom line
KDP's cover specifications are specific but learnable. Ebook covers are JPEG or TIFF in RGB, at or near 2,560 × 1,600 pixels. Print covers are full-wrap PDF in CMYK, with dimensions calculated from your trim size, page count, and 0.125-inch bleed. Getting both right before upload avoids rejection and reprinting delays.
If your manuscript is still being formatted, finalize the interior first, then design the cover using the final page count. Our KDP formatting checklist walks through the interior requirements that determine your print cover dimensions.
Cover and interior files go together; the cover's spine width depends on the interior's final page count. Finalize your interior formatting first, then build your cover. Our KDP formatting checklist walks through the interior requirements, and our KDP publishing guide covers the full upload process once both files are ready.
Ready to format your interior? Get started in LiberScript or see pricing for all plans.
Ready to bring your book to life?
Write, critique, design, and export your book — all under one roof. Or let our team of experts ghostwrite, edit, format, or design your cover for you.
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