I can download an epub on my mobile. I can email an epub from my mobile. I can't run calibre from my mobile. I can rename .epub to .png and email that from my

I can download an epub on my mobile. I can email an epub from my mobile. I can't run calibre from my mobile. I can rename .epub to .png and email that from my mobile. Yes, I can host calibre somewhere else. No, my technologically savvy friends and family cannot. I also don't want them to depend on me to be able to convert an epub for their kindle when there's a trivial solution that doesn't require additional dependencies.