A Gumroad product needs two images: a wide cover on the product page and a square thumbnail for places like your profile and Discover. Making them separately often leaves the two looking unrelated, so this tool draws both from one set of inputs.
You can show your product as a simple drawn book or box, which helps a digital download look like a thing someone can own. Everything is drawn in your browser, and any image you add stays on your device.
Gumroad image sizes
Gumroad Help says a cover should be 1280 x 720 pixels at least 72 DPI, and a thumbnail at least 600 x 600. This tool exports the cover at 1280 x 720 and the thumbnail at 1200 x 1200, which leaves room for sharp display. Last checked October 2026.
A drawn mockup, not a photo
The book and box are simple shapes drawn with code, not a photo of a printed item. If your product is digital only, make that clear in your description, so a buyer does not expect something in the post.