# Ebook cover size checker and resizer for KDP, Apple Books, Kobo and Gumroad Amazon KDP recommends an ebook cover 2,560 pixels high by 1,600 wide, in JPEG, and refuses one over 50 MB. Apple Books, Kobo and Gumroad each have rules of their own. Choose your image to check it against all four and save a copy at the size each one wants; the file never leaves your browser. Last reviewed 29 October 2026. Web page: https://chapbook.ink/tools/ebook-cover-size-checker/ ## Cover rules by store Checked on each store's own help page on 29 October 2026; Amazon KDP's on 29 October 2026. A required rule fails the upload; a recommended one is the store's advice. ### Amazon KDP: Kindle eBook cover - Required: JPEG, PNG, GIF (non-animated) or TIFF. - Required: At least 500 pixels on the longest side. - Required: 10,000 pixels or fewer on each side. - Required: At most 50 MB. - Recommended: The shape of 2,560 pixels in height x 1,600 pixels in width. - Recommended: 2,500 pixels high or more, for high-definition screens. - Recommended: JPEG is the preferred format. The resizer makes 1,600 × 2,560 pixels: KDP’s recommended size. Source: [Amazon KDP, “Cover Image Guidelines for Kindle eBooks”](https://kdp.amazon.com/en_US/help/topic/G6GTK3T3NUHKLEFX) ### Apple Books: Book cover art - Required: PNG or JPEG format. - Required: At least 1,400 pixels on its shortest side. The resizer makes 1,600 × 2,560 pixels: clears Apple’s minimum at KDP’s shape. Source: [Apple Books Partner Support, “Prepare your book”](https://itunespartner.apple.com/books/support/9-prepare-book) ### Kobo Writing Life: eBook cover - Required: A .jpg or .png file. - Recommended: No larger than 5 MB. - Recommended: The shape of the standard Kobo eReader’s 1448 by 1072 screen. The resizer makes 1,072 × 1,448 pixels: the Kobo eReader screen Kobo suggests designing for. Source: [Kobo Writing Life, “Setting up a New eBook”](https://kobowritinglife.zendesk.com/hc/en-us/articles/360058975732-Setting-up-a-New-eBook) ### Gumroad: Product page cover - Required: A PNG, JPEG or GIF image. - Required: Smaller than 50 MB. - Recommended: The shape of 1280 pixels wide x 720 pixels tall, as a rule of thumb; a tall cover is shown at its own shape. The resizer makes 1,280 × 720 pixels: Gumroad’s rule of thumb for an image cover. Source: [Gumroad Help Center, “Adding cover and thumbnail images”](https://gumroad.com/help/article/60-adding-a-cover-image) ### Gumroad: Optional thumbnail (library, Discover, profile) - Recommended: At least 600 x 600 pixels. - Recommended: Square, as the thumbnail shows. The resizer makes 600 × 600 pixels: Gumroad’s square thumbnail. Source: [Gumroad Help Center, “Adding cover and thumbnail images”](https://gumroad.com/help/article/60-adding-a-cover-image) The checker reads the image's size, shape, file size and format in your browser. The resizer crops it to fill the store's size, or pads it with a colour, and saves a JPEG. Nothing is uploaded. ## What it checks For each store, the checker reads four things from your file: its width and height in pixels, its shape, its size on disk and its format. A required rule is one the store's own page says an upload fails without. A recommended one is the store's advice, which a file can miss and still upload. One thing it cannot read from the file is its colour mode: Apple asks for RGB, and KDP recommends it. Check that in the program you made the cover in. ## How the resizer fits a cover Pick a store and the resizer makes a JPEG at that store's size. **Crop** scales the image until it fills the size and trims what is left over evenly from both sides. **Pad** scales it until it fits whole and fills the bands with a colour, which starts as the average of your image's edge so the bands read as its own ground. If the store limits the file size, the JPEG's quality is lowered only as far as the limit needs. If the image has to be enlarged to fit, the resizer says so: an enlarged cover looks softer, and a larger original is better. ## Made with Chapbook: Five Pricing Mistakes Five Pricing Mistakes: A ten-minute read for founders, by Jane Founder. Lead magnet, 3,735 words, 17 pages. A sample generated from one brief and exported unedited; it is not a customer's book. Read every page: https://chapbook.ink/examples/lead-magnet/ The brief: > The five pricing mistakes that cost early software companies customers, and what to do instead. Promise: In ten minutes you will recognise which of the five mistakes you are making and know the first step to fix each one. Reader: A technical or product-minded founder who set the price by copying a competitor or guessing, and suspects it is wrong. Voice: Short paragraphs, concrete examples with realistic fictional companies, no invented statistics or studies; reason from mechanics and examples. The outline the planner proposed: 1. Introduction (291 words) 2. Mistake 1: Copying a competitor (558 words) 3. Mistake 2: One tier for everyone (588 words) 4. Mistake 3: Never asking (608 words) 5. Mistake 4: Anchoring on your costs (641 words) 6. Mistake 5: Never revisiting the number (606 words) 7. What to do instead (411 words) ## Questions ### What size should a Kindle ebook cover be? KDP recommends 2,560 pixels high by 1,600 wide, in JPEG. The upload fails under 500 pixels on the longest side, over 10,000 on either side or over 50 MB, per KDP's cover guidelines as checked on 29 October 2026. ### What size should an Apple Books cover be? Apple Books asks for PNG or JPEG cover art in RGB, at least 1,400 pixels on its shortest side, and sets no recommended size, according to its partner support page as checked on 29 October 2026. ### What size does Gumroad use for a cover? Gumroad suggests image covers of 1,280 × 720 pixels under 50 MB, shows a tall cover at its own shape, and takes an optional thumbnail of at least 600 × 600, per its help center as checked on 30 October 2026. ### Does the cover checker upload my image? No. Your browser reads the image and resizes it on the page itself. The file is never sent anywhere. ### Should I crop or pad a cover to fit a store's size? Crop when the edges can go: it fills the size and trims evenly from both sides. Pad when every part must stay, such as a title near the edge: it keeps the whole image and fills the bands with a colour. ## Sources - [Amazon KDP, “Cover Image Guidelines for Kindle eBooks”](https://kdp.amazon.com/en_US/help/topic/G6GTK3T3NUHKLEFX) - [Apple Books Partner Support, “Prepare your book”](https://itunespartner.apple.com/books/support/9-prepare-book) - [Kobo Writing Life, “Setting up a New eBook”](https://kobowritinglife.zendesk.com/hc/en-us/articles/360058975732-Setting-up-a-New-eBook) - [Gumroad Help Center, “Adding cover and thumbnail images”](https://gumroad.com/help/article/60-adding-a-cover-image)