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Custom World Height+

Custom World Height+

Custom World Height lets you customize Minecraft dimension height limits.

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Compatibility

Minecraft: Java Edition

1.21.6–1.21.10

Platforms

Supported environments

Server-side
Singleplayer

Tags

Creators

Details

Licensed CC0-1.0
Published yesterday

Custom World Height

Customize the height limits of Minecraft dimensions with simple commands. Create taller Overworlds, expand the Nether, or adjust the End to fit your world-generation needs.

Features

  • Change dimension height limits using commands.
  • Supports the Overworld, Nether, and End independently.
  • Saves settings automatically to a configuration file.
  • Simple and lightweight implementation.
  • Works through a configurable per-dimension height system.

Commands

Set Height for Current Dimension

/customworldheight <height>

Set Height for a Specific Dimension

/customworldheight <height> <dimension>

Examples

/customworldheight 512
/customworldheight 512 overworld
/customworldheight 256 the_nether
/customworldheight 384 the_end

Supported dimensions:

  • overworld
  • the_nether
  • the_end

Height Behavior

Overworld

  • Minimum Y: -64
  • Maximum Y: (height - 65)

Example:

/customworldheight 512 overworld

Result:

Y = -64 to Y = 447

Nether

  • Minimum Y: 0
  • Maximum Y: (height - 1)

End

  • Minimum Y: 0
  • Maximum Y: (height - 1)

Important Warnings

⚠️ Read carefully before using this mod.

Always Configure Height Before Creating a World

For best results, set your desired height before generating a new world.

Never Change Height While a World Is Loaded

Changing dimension height settings while playing can cause serious issues.

Restart Minecraft After Changing Height

After using the command:

  1. Save and exit your world.
  2. Close Minecraft completely.
  3. Launch Minecraft again.

The new height settings will only apply correctly after a full restart.

Existing Worlds Are Not Compatible With Different Heights

Opening a world with a different configured height than the one it was created with may cause:

  • Crashes
  • Chunk errors
  • World corruption
  • Other unexpected issues

Creating a new world after changing height settings is strongly recommended.

Configuration

The mod stores all height settings in:

.minecraft/config/custom-world-height.json

Settings are automatically saved whenever a height value is changed.

How It Works

  1. The mod loads its configuration file during startup.
  2. Height values for each dimension are read from the config.
  3. The /customworldheight command updates and saves these values.
  4. Minecraft's dimension height calculations are overridden using Mixins.
  5. After restarting Minecraft, newly created worlds use the configured height limits.

Recommended Usage

  1. Install the mod.
  2. Launch Minecraft.
  3. Set your desired height using the command.
  4. Close Minecraft completely.
  5. Restart Minecraft.
  6. Create a new world.
  7. Enjoy your custom-sized dimensions.

Note

This mod modifies dimension height limits at a fundamental level. Following the setup instructions and warnings is essential to avoid compatibility and world-generation issues.