Most electronics these days can be charged at both U.S. and European voltages without needing a converter so you might even be able to get away with just a plug adaptor.
True with some, but not all. When in doubt, use a converter. They're rated by Amps and tend to be heavy. The plug adapters what I have to lend if needed.
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."