,.pdf to .jpg file conversion?

Do any of you  by any chance know if it’s possible to copy a .pdf file into a .jpg file. I had created a postcard in Word that combines text and pictures which I then converted to .pdf to mail out to potential clients and now I want to use this promotion in my Kickstarter campaign for the movie but they require a .jpg file, not a .pdf. So is there any way you know to do that? If so I’d be grateful.
Thanks,
Marc