Want a credential as “Certified Butter Coffee Expert” by “Cafetura Instituta de Burra”? Maybe a paper that shows you are a world leading expert in growing pet animals for office use?
Have an online generator. Input a short description of what you need, and get a certificate generated. Choose from multiple styles of design (modern, old european etc.), types of text (comic, satirical, dead pan, serious etc.). Download it or get it sent to your address nicely printed.