In general, Dortmund is quite safe, especially during the day. However, I would be more careful and cautious when walking in Nordstadt. It’s best to choose places like Phoenixsee or the city center for a walk.

Dortmund it’s really safe, very quiet and peaceful, it can be a little be dangerous in the central station at night, a lot of homeless, also can be a little bit dangerous when there’s a BVB Game because there’s a lot of drunk people (that’s what I see in the news), but I don’t have any safety problems here, I think it’s only that I would say

Dortmund is basically safe. However, I would avoid deserted streets after dark. I would also avoid large groups of men. If you're not obviously carrying expensive items, there's little risk of being robbed. Public transportation is very safe.