Canonical Information: Information provided below is entirely canonical.

Minish Portals are enchanted objects that appear in The Legend of Zelda: The Minish Cap. Specifically, Minish Portals are portals that allows Link to shrink to the size of a Minish. Minish Portals come in many forms, like old tree stumps or pots that have been flipped over. When Link climbs on the top of a Minish Portal, Ezlo starts chanting, invoking the magic with chants, shrinking Link and himself. Link will return to his original size by repeating the process.