I typically convert logos to TrueType fonts. This delivers me a vector format and makes the logo easily scalable.
I used two different programs in the past.
1. FontForge: free, but a little bit difficult to use for a first time user (or for seldom use).
2. FontCreator from HighLogic: 49$ / 149$, but there is a trial version available. Much easier to use than FontForge, in my opinion
Maybe there are other programs which can vectorise a picture into a true type font.