Maximum resolution

Saying we have, theoretically, no hardware limits.

What is the maximum resolution that Unity can handle?

Unity doesn’t have any “maximum resolution”. It’s a 3D engine, it just sends out vertices and stuff for your graphics card to draw, and doesn’t concern itself with details like resolution, which is up to your system to handle.

I haven’t seen this documented anywhere – in my experience, resolution is usually limited by hardware far before software limitations come into play.

You can find available resolutions on the runtime machine using Screen.resolutions.