Standardize Shopify Product Images

I have roughly 700 product photos in my Shopify store that need to look as if they all came from the same photo shoot. Every file must end up at exactly 800 × 800 px with a clean white background. The... (Budget: $30 - $250 USD, Jobs: Background Removal, Data Entry, Excel, Graphic Design, Image Processing, Photo Editing, Photoshop, Shopify)