World Customizer
by BaGaJa
World Customizer lets players set terrain and spawn rules when they create a new world, through a customization screen with presets and saved settings.
What it does
The mod opens a world customization screen when a world is created. Vein size, veins per chunk and the minimum and maximum height of ores can be changed, along with stone variations, natural blocks such as dirt and clay, and Nether blocks like gravel. Spawning of trees, caves and fluids can be adjusted for the Overworld and the Nether. The mod also brings back a feature that was removed from the game in an earlier release.
Settings can be saved as presets for special worlds, or written straight to a worldcustomizer.json file inside the world's folder in saves. Several sliders can be synced at the same time. Structure toggles for villages and strongholds are mentioned as a possible addition and are not confirmed on the Modrinth page. Forge is the only loader, and the mod runs on client and server, so the server and every player need it. Builds cover 1.20.4 – 1.21.11, and the code is not open source; it is under All rights reserved.
Key features
Ore and vein settings
Vein size, veins per chunk and minimum and maximum height can be set for each ore during world creation.
Block and terrain changes
Stone variations, natural blocks and Nether blocks can be replaced to change how the generated terrain looks.
Presets and saved settings
Configurations can be stored as presets for special worlds and saved directly from the screen.
Settings file in the world folder
The chosen options are written to worldcustomizer.json inside the world's save folder, where they can be read or copied.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Custom ore distribution
Players who want rarer or more common ores can change vein size and height limits before generating a world.
Themed worlds on a server
Server owners can save presets for special worlds and reuse the same settings across new worlds.
Who it’s for: Players who create new worlds and want control over ores, terrain blocks and spawning, and server owners who run custom world setups.
How it compares
Block Veins is server-side only, under the MIT License, and covers 1.20.1 – 1.21.11, so players can join without installing it. Reduced Ores is server required with an optional client, under All rights reserved, for 1.20.1 – 1.21.10, and changes ore amounts rather than the world creation screen.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| World Customizer | Forge | 1.20.4 – 1.21.11 | Client and server | 2026-03-18 |
| Block Veins | Forge and NeoForge | 1.20.1 – 1.21.11 | Server-side only | 2025-12-14 |
| Reduced Ores | Forge and NeoForge | 1.20.1 – 1.21.10 | Server required, client optional | 2026-03-16 |
Questions
Which loaders does World Customizer support?
Does the server need World Customizer?
Where are the custom settings stored?
In the catalog
World Customizer is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 19,862 mods support Minecraft 1.21.11.
More from BaGaJa
Similar mods
What the author says
Path: ".minecraft\saves\your world name\worldcustomizer.json"
Official listing
- Modrinth page
- modrinth.com/mod/world-customizer
- Owner
- BaGaJa
- Published
- 2026-03-16
- Updated on Modrinth
- 2026-03-18
- Facts verified
- 2026-10-15