Updated:
Basic form
/fill <from> <to> <block> [mode]/fill ~-2 ~-1 ~-2 ~2 ~-1 ~2 minecraft:stoneThis makes a 5×5 stone floor one block below you. Start this small until you are sure which way the coordinates point.
Count the blocks first
Both corners are included. From X 0–4, Y 64–66 and Z 0–2 the box is (4−0+1)×(66−64+1)×(2−0+1) = 45 blocks. A quick count shows whether the box is the size you expect.
Modes
| Mode | What it does |
|---|---|
replace (default) | Replaces everything in the box |
destroy | Breaks existing blocks as if mined, dropping items |
keep | Only fills air |
hollow | Builds the outer shell and fills the inside with air |
outline | Builds the outer shell and leaves the inside as it was |
Use hollow for a room, outline to wrap something that already exists.
Examples
# A wall 5 blocks east, 5 high and 11 long
/fill ~5 ~ ~-5 ~5 ~4 ~5 minecraft:stone_bricks
# Carve out a small room
/fill ~-3 ~ ~-3 ~3 ~3 ~3 minecraft:air
# Turn only dirt into grass on the floor
/fill ~-5 ~-1 ~-5 ~5 ~-1 ~5 minecraft:grass_block replace minecraft:dirtKeeping one coordinate the same on both corners gives a flat wall or floor. A block after replace limits the change to that block only.
The size limit
One /fill changes at most 32,768 blocks (32×32×32). Split bigger areas into several commands, and back up the world before large changes.
On Java Edition 1.20.3 and later, this limit is a gamerule, commandModificationBlockLimit (default 32768). It also applies to /clone and /fillbiome. On a test world you can raise it with /gamerule commandModificationBlockLimit 100000, but huge fills can freeze the server for a while. Newer versions may list the rule under a different name, so use tab completion after /gamerule to find it. Bedrock Edition has no such gamerule, so split the area instead.
When it does not work
- "Too many blocks": the box is over the limit; split it.
- "That position is not loaded": part of the box is too far away. Move closer.
- It filled the wrong direction:
~follows the world axes, not where you face. Check Facing on the F3 screen; see relative and local coordinates. - Water rushed in: clearing with air next to water lets it flow. Block it off first.
Common questions
- Can I undo a fill? No. Back up first, or copy the area elsewhere with /clone.
- Is Bedrock the same? The basic form and the limit match. Block states are written differently, so follow the in-game suggestions.
- Single blocks? Use /setblock.
The fill generator keeps the six coordinates and the mode in separate fields so they are easier to check.
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