Yes, once your files are uploaded you will be shown a preview of your document.
This gives you the opportunity to check for typos, margin issues and pixelation etc.
Your document will be printed as per the document preview, so please check it thoroughly. You can move between pages and zoom in/out as necessary.
When you are happy with the preview and configuration, click 'Go to basket' to add the document to your basket.
Screenshot of document preview tool: