I only print A4, so unfortunately I can't answer the question like 14digi12. But the thing can print A5, but the envelope is a bit delicate because it is thicker and has a "detachable" part. I hope another user can answer your question from practical experience. Otherwise the printer is quite good, not very fast but perfectly suitable for my needs and so far reliable, the large tanks are a big advantage and I only had to do the head cleaning a few times, apparently the printer does that at least partly by itself when it is not used much.

Not tested, but according to the manual/instructions, envelopes and other small formats can be printed via the normal paper feed.