Canva is a website (and an app) that helps you create beautiful graphics to use in social media, slide shows, blog posts (my graphic was made with Canva), documents and more.
You can also log in with your Google account so that makes it easy to remember your user information. :)
From the website, just select the type of graphic you want to create - it's ok if you don't see the exact thing you are looking for, you can do a custom size graphic as well. Also remember, just because it says social media as the graphic type don't let if fool you. You can still use that graphic for many things. Click the + sign to see more graphics options. Finally, there are free tools and paid tools. I've never paid for a graphic, but if I need to, they are very inexpensive. I encourage you to take a look at this site - you won't be sorry.