A Google search "convert bmp pdf" brings up a couple of American sites (click here is one of them) which do what you want, but they're both $38. Maybe you can find a free on with a bit more searching.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
What’s happening in VR right now: From psychedelic art to combat therapy
Siri not working? Try these troubleshooting fixes
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.