I use Flashdevelop.
How to set the dimensions of flash player in Flashdevelop?
Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up.
Sign up to join this communityThe size is given in Project/properties/output/dimension, but it can be overwritten by this line if placed in an actionscript file:
[SWF(width="640",height="400",backgroundColor="#000000",frameRate="30")]
with the values after the width and height being whatever you want the width and height to be.