It maintains the original 4:3 aspect ratio (black bars on the sides) to preserve the full frame without cropping.

The release of the official ATLA remastered edition in 1080p fundamentally changed how audiences experience the World of Avatar. By upgrading the visual quality to full high definition, this remaster bridges the gap between mid-2000s television limitations and modern display standards. The Problem with the Original Broadcast Quality

Subtle details in the animation, such as the texture of clothing or the intricate designs in bending, are more visible.