When using eDocBuilder for your products, you can choose to include a proof file on the confirmation page when your customer completes their order. The default is a PDF file. You also have the option of having a JPG or PNG file available for download instead.
You will find this option by going to Sites > Settings > under the Checkout section > eDocBuilder File Type for Proofs.” By default it will create a PDF. By selecting the dropdown, you can choose JPG or PNG instead. Please note that both of these file types are image file types so only the first page of the proof file will be available.