You can watch the video tutorial, which provides a step-by-step guide through the process.
You can change the size of product pictures on your documents such as invoices, drafts, credit notes, packing slips, return forms, and quotes by following the simple steps below:
Changing the size of product pictures will change the size of your documents’ PDF files.
Step 1: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 2: Click on “Templates” in the Simple Invoice dashboard.
Step 3: Scroll down to ‘Product Images’ under ‘Styling’ and select the image size from theproduct image dropdown menu then click the “Save” button.
