Fill Generator

The /fill command sets every block in a rectangular region at once. It is how large structures are cleared, floors are laid and hollow rooms are built without placing anything by hand, and it is the single biggest time saver in map building.

Define the two opposite corners of the region, choose the block and select a fill mode. The region is inclusive of both corners, so the block count is one larger per axis than the coordinate difference suggests.

• Vanilla limits a single fill to 32,768 blocks; larger areas have to be split into several commands.
• The hollow mode fills only the outer shell and replaces the interior with air, which is how rooms are made.
• The outline mode fills the shell but leaves the interior untouched.
• The replace mode with a filter changes only blocks matching that filter, which is the safe way to edit an existing build.

The generated command is produced entirely in your browser and nothing you enter is sent to EloTiers. Paste the result into the chat bar or a command block in your own world. If a command is rejected, check that the Minecraft version selected here matches the version you are actually running — the item and entity data format changed substantially in 1.20.5.