I have some books left over from a signing I did and I’d like to sell them at an upcoming event but I want to add in a little extra so I was thinking of doing bookmarks. Do you know any good apps or websites that would let me create a custom design and print it out? much appreciated!
You might try Canva, or GIMP if your design is more complex. Avery paper products might have bookmark stock you can run through your home printer. Or take the file to Staples or Office Depot for them to print.