Any software or website that lets you change the key of a song without lowering or raising the pitch?

learn to google
audacity and most daws should be able to do this
search up a tutorial

wdym anon?
by definition changing the key is changing the pitch
c major --> c# major everything is raised one half step
c major --> b major everything is lowered one half step

you mean changing the key while preserving the same tempo?

I think he means changing it from a major key to a minor key, or something like that.