Oh you wanna do a pdf? Use Libreoffice and export as pdf. Krita is a open source alternative to photoshop as is gimp. Gimp has came a long way and is a functional replacement for photoshop these days without all the ugly AI stuff.
I think I read that but I've never tried. I mostly use gimp for image format conversion. My daughter on the other hand can make both Krita and Gimp do all kinds of tricks.