The dimensions of a book cover determine whether Amazon KDP or Apple Books will accept your file. Standard Kindle book cover dimensions recommend at least 2,560 pixels on the long side, a 1.6:1 portrait ratio — plus JPEG format and file size under 50MB. Upload your cover and this Cover Checker measures all of it instantly, in your browser. No upload to a server, no signup.
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KDP and Apple Books cover requirements
Amazon recommends 2560 × 1600 pixels for Kindle ebook covers, a 1.6:1 ratio, saved as JPEG. The minimum is 625px wide × 1000px tall — below that, covers will not display on Amazon at all. Covers below 2560px on the longest side often look soft on high-resolution Kindle devices. Apple Books requires a minimum of 1400 pixels on the shortest side. This tool checks your cover against both sets of requirements before you upload it anywhere, entirely in your browser.
Frequently asked questions
Amazon recommends 2560 × 1600 pixels for Kindle covers, a 1.6:1 height-to-width ratio. The minimum is 625px wide × 1000px tall — covers below that will not display on Amazon. Anything below the recommended size will also look soft on high-resolution screens.
No. KDP requires JPEG format for ebook covers. PNG files are not accepted, even if the dimensions are correct.
Apple Books requires a minimum of 1400 pixels on the shortest side of your cover image.
No. The image is read and measured entirely in your browser. Nothing is uploaded to a server.
KDP accepts cover image files up to 50 MB. In practice, a JPEG cover at 2560 × 1600px saved at high quality is typically 2–8 MB — well within the limit. If your file is over 50 MB, re-export at a lower JPEG quality setting (85–90 is sufficient for print-level sharpness).
RGB (specifically sRGB) is required for all ebook covers on KDP and Apple Books. CMYK is a print color space — it will cause colors to display incorrectly on screen and may cause your cover to be rejected. If you designed in CMYK for a print edition, convert to sRGB before exporting the ebook cover.
This tool uses a tolerance of ±0.08 around KDP's 1.6:1 recommended ratio (height ÷ width). A ratio between 1.52 and 1.68 passes. Outside that range the tool flags a warning, but KDP will still accept the cover as long as it meets minimum dimensions — it just may not display optimally in search results and on product pages where covers are shown at a fixed ratio.
No. KDP print covers (for paperback and hardcover) have completely different requirements — the cover file must include front, spine, and back at a print-ready resolution (300 DPI), with exact dimensions calculated from your trim size and page count. KDP provides a cover template generator for print. This tool checks ebook covers only.