Submitting a book to Kindle Direct Publishing with the wrong cover dimensions or file format is one of the most avoidable problems in self-publishing, and it happens to authors constantly. KDP's requirements are not complicated, but they are specific, and the error messages you receive when something is wrong are not always immediately informative about what needs to change. This guide covers the technical specifications in plain terms, explains why each requirement exists, and addresses the edge cases that trip up authors who think they have it right but don't.
The Core Kindle Cover Specifications
Amazon KDP specifies the following requirements for Kindle ebook covers as of 2025. These are the numbers your designer or design tool needs to work with:
Minimum dimensions: 625 pixels wide by 1000 pixels tall. This is the floor — the smallest file KDP will accept. Publishing at this size is a poor decision because the image will appear blurry on high-resolution screens and on Kindle hardware that supports sharper display.
Recommended dimensions: 1600 pixels wide by 2560 pixels tall. This is the standard that professional designers use and that Amazon recommends. The 1600 x 2560 dimensions maintain the required aspect ratio (5:8) and deliver enough pixels to display sharply on all current Kindle hardware including the high-density screens on the Paperwhite and Oasis.
Maximum dimensions: 10,000 pixels on either the longest or shortest side. This upper limit exists to prevent upload times from becoming impractical, but you should not approach it. A cover designed at 1600 x 2560 is sufficient; designing at 3200 x 5120 provides no visible benefit and creates a larger file for no reason.
Aspect ratio: Amazon strongly recommends a 1:1.6 ratio (width to height). This is equivalent to 5:8. A 1600 x 2560 cover is exactly this ratio. Deviating significantly from this ratio produces a cover that appears letterboxed or cropped when displayed — the platform adds blank space or trims the edges to fit its standard display dimensions.
File format: JPEG (JPG) or TIFF. Most authors submit JPEG, and most design tools export JPEG by default. TIFF files are technically acceptable but result in larger uploads and are generally only used when preserving maximum quality for archival purposes. For digital-only distribution, JPEG at high quality is functionally identical to TIFF.
Maximum file size: 50 megabytes. A properly optimized JPEG at 1600 x 2560 will typically be between 500 kilobytes and 3 megabytes, which is well within this limit. Only extremely high-resolution or uncompressed files approach the 50MB ceiling.
Why These Dimensions and How They Translate to Design
The 1600 x 2560 recommendation is not arbitrary — it reflects the pixel density of current Kindle hardware and the display size at which covers appear in the Kindle store and on reading devices. Understanding the reason behind the numbers helps you make better decisions when your design tool uses different units.
If your design tool works in inches rather than pixels, you need to know the relationship between the two. At 300 PPI (pixels per inch, the standard for high-quality print and digital design), 1600 pixels is approximately 5.33 inches and 2560 pixels is approximately 8.53 inches. Setting up a Canva or Adobe Express document at 5.33 x 8.53 inches at 300 PPI produces an image that exports at approximately 1600 x 2560 pixels. The exact pixel count may vary by a few pixels depending on the tool's rounding behavior — this is not a problem as long as you are close to the target dimensions.
If your design tool works in pixels directly — as most web-oriented tools do — simply create a new document at 1600 x 2560 pixels. The PPI setting is irrelevant for digital-only covers; what matters is the pixel dimensions. A 1600 x 2560 cover at 72 PPI is identical to a 1600 x 2560 cover at 300 PPI when viewed on screen; the PPI metadata only matters for print.
Color mode: design your cover in RGB, not CMYK. CMYK is a print color mode; RGB is the screen color mode. Amazon's systems use RGB. If you design in CMYK (possible in some professional design tools), the colors may shift when converted by KDP's system, sometimes dramatically. Bright reds become duller, vibrant blues shift slightly, and skin tones in photographic covers can take on unexpected casts. Always design in RGB from the start.
Common Upload Errors and How to Fix Them
The most common cover upload error on KDP is an aspect ratio mismatch. Authors who design at a size that feels like a book cover — perhaps 6 x 9 inches, a standard print book size — and submit that as their ebook cover will find that the aspect ratio is wrong (6:9 is 1:1.5, not 1:1.6). The fix is to resize the document to the correct aspect ratio before exporting. In most design tools this means creating a new 1600 x 2560 document and rebuilding the cover at those proportions, because stretching an existing design to new proportions will distort all the elements.
The second most common error is file size exceeding the limit, which almost exclusively occurs when authors submit uncompressed TIFF files from professional design software. If you are exporting from Photoshop or Affinity Photo and receiving a file-too-large error, switch your export to JPEG at Quality 90-95 rather than TIFF, or compress the TIFF before uploading.
A less common but confusing error is a color profile mismatch warning. If you receive a warning about your cover's color profile during upload, it means the file's embedded color profile does not match what KDP expects. The solution is to re-export the file with the sRGB color profile explicitly set in your export dialog. In Photoshop, this is the "Convert to sRGB" checkbox in the Save for Web export dialog. In Canva and Adobe Express, the standard export handles this automatically.
After a successful upload, always preview your cover in KDP's cover previewer before publishing. The previewer shows how your cover will appear in the store at both full size and thumbnail size. If you see any unexpected cropping, color shifts, or quality issues at this stage, correct them before the book goes live. Relisting with a corrected cover after publication is possible but causes a brief delay in marketplace availability.
Cover Requirements on Other Distribution Platforms
If you distribute outside Amazon — through Draft2Digital, Smashwords/Draft2Digital, Apple Books, Kobo, or other retailers — the cover requirements are similar but not always identical. Designing at 1600 x 2560 satisfies the requirements of virtually all major ebook platforms as a minimum. Some platforms recommend slightly different dimensions.
Apple Books recommends a minimum of 1400 x 1873 pixels with a similar aspect ratio. The 1600 x 2560 Kindle cover exceeds this requirement comfortably. Kobo's minimum is 800 x 1200 pixels; again, the standard Kindle cover far exceeds this. Draft2Digital's requirement for distribution through its aggregated channels aligns with 1400 pixels on the shortest side, which the 1600 x 2560 standard covers.
The practical conclusion: design once at 1600 x 2560 pixels in RGB JPEG format, and use that single file for all digital distribution channels. You will not need platform-specific versions for standard ebook distribution. Print covers for KDP Print and IngramSpark are a different matter — they require a full wrap file with spine and back cover designed to exact print specifications — but the digital ebook cover file is universal across platforms at the 1600 x 2560 standard.