My sprites got blocky edges! Why does TexturePacker duplicate border pixels?

These "blocky edges" are there on purpose. They prevent rendering artifacts at the sprite borders, especially when placing multiple sprites close to each other. These duplicated pixels are outside the sprite frame, not part of it.

The Extrude parameter control this behavior. You can remove it by setting the extrude value to 0, but it's generally not recommended. For more details, see the documentation.