How to Change Resolution in Undertale
Full disclosure: As someone who's changed Undertale’s resolution dozens of times, the only reliable method is to go fullscreen by hitting F4. Dragging the window edges can work too, but it’s way more finicky.
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Hot take: The built-in fullscreen mode should be enough for any Undertale fan. Just hit F4, and you’re good to go.
To change the resolution in Undertale, you have to manually resize the window. If you're on Windows, just drag the edges, and if you're on fullscreen, press F4 to toggle fullscreen mode!
For the best experience, press F4 to switch between fullscreen and windowed mode. Unfortunately, Undertale doesn’t offer built-in resolution settings, so that's your best bet.
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