The size of an end portal is predetermined and cannot be changed. It consists of a 12x12 block frame with a 3x3 block portal in the center. The portal itself is always 3 blocks wide and 3 blocks tall.
Here's a breakdown of the dimensions:
- Frame: 12 blocks wide x 12 blocks tall
- Portal: 3 blocks wide x 3 blocks tall
Example:
The end portal frame is made of obsidian blocks, and the portal itself is formed by the frame's structure. You cannot change the size of the portal, as it's set by the game mechanics.
