There are so many websites out there from Gimp, Pixlr to Picmonkey! The website I use is Canva because it has all the templates you'll ever need, you can search for copyright free photos OR purchase if you really wanna.

You do have to create an account but you can store all your files on the account which is great because I lose things so easily.

There're templates for Wattpad book covers, Instagram posts, headers for social media and your chapters. You can make a stunning cover so quickly on Canva!

You can source images from Unsplash, Pixabay and Pexels which are all free to use. I have some cute pictures pinned on Pinterest (links on my profile).