[Fnoord]

Wikipedia has good information about tipping customs and laws in countries throughout the world. Here's the Swedish entry [1].

As a rule of thumb: apart from the English-speaking countries in EU, tipping is not mandatory.

[1] https://en.wikipedia.org/wiki/Gratuity#Sweden

[GordonS]

It's not mandatory in the UK either. It's certainly pretty common in restaurants, as long as they don't already add a service charge, but it's unusual to tip in just about any other situation.