Fill Observer — Java Edition

Verified for Java 26.2

The /fill command for Observer in Minecraft Java Edition. Java Edition requires the minecraft: prefix and supports all five fill modes including outline.

Default (fill region)

Java/fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer

Hollow (shell only)

Java/fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer hollow

Keep (fill only air)

Java/fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer keep

Destroy (drop items)

Java/fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer destroy

Outline (border only)

Java/fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer outline

Java Edition fill syntax notes

Block must use minecraft: prefix
Coordinates use relative notation: ~ = current position, ~10 = 10 blocks away
Java Edition supports outline mode (Bedrock does not)
Maximum fill volume is 32,768 blocks (32×32×32)

Frequently asked questions

What is the Java Edition fill command for Observer?: The basic command is /fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer. This fills an 11×6×11 region starting from your position. Adjust the coordinates to change the size and shape.
What fill modes does Java Edition support?: Java Edition supports replace (default), hollow, keep, destroy, and outline. The outline mode fills only the border of the region, which Bedrock Edition does not support.
How do I fill a hollow structure in Java Edition?: Use the hollow mode: /fill ~ ~ ~ ~10 ~5 ~10 minecraft:observer hollow. This fills only the outer shell, leaving the interior empty — useful for building rooms.

All variants →Bedrock Edition →Browse all Fill commands →