The Auckland radio host demonstrated the hack by printing out a photo of her side profile, cutting off the feet and laminating it.
She then positioned the printout above images of shoes online to see if they would go with her outfit.
It means she can avoid having to return items bought online, as she knows exactly how they'll look before they arrive.
The video, captioned "Megan's online shoe shopping trick is too good" had social media users very impressed.
"Game changer!" one wrote.
Another commented: '"I'm going to start doing this", with a third adding "Why am I laughing so much? That's brilliant!"
