Click the "Send to back" to make the picture appear in the background of the PDF. Click the "File" menu's "Export as PDF" command, then follow the prompts to save the modified PDF.

Do you want to make your Illustrator images have a transparent background?Learn how to make your white background transparent.

Adobe has made photo background removal easier than ever in Photoshop. We walk you through the process so that you get the best results possible.