Resize one product photo for every marketplace and social size at once, check a main image against marketplace rules before you upload, and make thank-you cards for your parcels. Everything runs in your browser; your photos are not uploaded.
Marketplace sizes get a pure white background; social sizes get a soft blurred background from your photo. Sizes change now and then; check your seller panel before a big upload.
Also make sure the main image is a real photo of the product, with no text, logos, badges, watermarks or extra items. Passing these checks doesn't guarantee a marketplace accepts the image.
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