How to set a world border in Minecraft

Type /worldborder set 2000 in chat as an operator for a border 2000 blocks wide, and /worldborder center 0 0 to center it on 0 0.

worldborder

Sets the size, center and damage of the world border, and can grow or shrink it over time.

/worldborder <set|add> <distance> [<time>]

Examples

/worldborder set 2000

Limits the world to 1000 blocks from the center.

/worldborder center 0 0

Centers the border on 0, 0.

/worldborder set 200 600s

Shrinks the border to 200 over ten minutes.

Arguments

distanceRequired: Border width in blocks, or the amount to add for add.
timeOptional: How long the resize takes: ticks, or a value with s or d.

What it does

The distance is the border's full width (diameter), not its radius, so set 2000 gives 1000 blocks in each direction from the center. Add a time to set or add to resize gradually; in 26.x the time uses game time units, so a plain number is ticks and 600s is ten minutes. damage and warning control what happens near and outside the border.

Good to know

Needs operator permission level 2.
Other forms: center <x z>, damage amount, damage buffer, warning distance, warning time and get.

Run it on your server

On a SLASHPLAY server, type it in the Console tab without the leading slash; in game, operators type it in chat with the slash. New to this? Start a Minecraft server first.

Your own
Minecraft server.

Start a Minecraft server All commands

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