Glow effect boundaries

Hi Community.

Is there any theoretical method to see where the glowing fx bleed actually finishes when applied to an object? 

I sometimes export an image, be it a shape, or an imagine with applied Glow Fx to it, and when I import it in another editing software, I can see sudden hard edges from the glow. Sometimes even masking and feathering, I still get hard edges. 

In order to counter this problem, I usually export larger compositions boundaries to avoid hard edges, but is there another method the industry uses around this problem Im facing?

Thank you.