Here's all you need to know about Minecraft's hitboxes, including how to activate them and how exactly they work!

How to show hitboxes in Minecraft Java edition The hitbox on a zombie image via Minecraft forum Hitboxes in Minecraft's java edition can be seen by pressing the F3 key and B key at the same time.

You can see chunk borders in Minecraft: Java Edition using wireframes, and in Bedrock by using coordinates.