Dolphin, the GameCube and Wii emulator - Forums

Someone brought this up a while back also iirc

For reference, people who really want to post all their settings can just create a zip of the User/Config folder and upload it somewhere.

(just mentioning this here since people seem to redirect users to this thread... it's obviously not quite as easy as having a single "export stuffz" button, so no real need to discuss it)