Custom Dimensions
Custom Dimensions lets a server administrator create custom dimensions and link them to the overworld with physical portal frames.
What it does
Custom Dimensions is a server-side Fabric mod. Server administrators define custom dimensions and portal frames, and each portal forms a persistent two-way gateway between worlds. Players join with an unmodified vanilla client, so only the server needs the mod installed. Fabric API is required, and the server must run a Fabric Loader version that matches the mod's build.
The mod is set up through configuration files that are generated on the first server start. Should a file become unreadable or malformed, the mod keeps a copy of it and restores safe defaults in its place. Dimensions and portal definitions can be created and managed with commands, and a restart applies a new or edited definition. Server owners who want a restricted portal can set permission levels, where level 0 allows everyone and level 4 requires an operator at level 4.
Key features
Custom dimensions
Server administrators create dimensions and define how each one is generated, then restart the server to use the new target.
Persistent two-way portals
Portal frames connect worlds with gateways that stay active between sessions and work in both directions.
Portal frame validation
Frames are checked when a portal is built, and a portal deactivates when a frame block is broken.
Distinctive frame blocks
A definition can use a frame block such as crying obsidian, so custom portals never compete with vanilla Nether portals that use obsidian.
Igniter and selection
Some definitions share a frame block, and a physical ignition selects the alphabetically first match; a sneak with flint and steel can pick a specific definition.
PvP arena dimension
A default customdimensions:pvp arena is created, giving server owners a ready example of a custom dimension.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
ShadowBorders is server-side only, released under the GNU General Public License v3.0 only, and published for 1.21 – 1.21.8. Dimension Daddy is also server-side only, released under the MIT License, and covers 1.21.11 – 26.2. Custom End Portals needs both the client and server, is released under the MIT License, and covers 1.21.1 – 1.21.3. Custom Dimensions is not open source and is released under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Custom Dimensions | Fabric | 1.21 – 26.3 | Server-side only | 2026-10-06 |
| ShadowBorders | Fabric | 1.21 – 1.21.8 | Server-side only | 2025-04-25 |
| Dimension Daddy | Fabric | 1.21.11 – 26.2 | Server-side only | 2026-07-03 |
| Custom End Portals | Fabric | 1.21.1 – 1.21.3 | Client and server | 2024-10-28 |
Questions
Does Custom Dimensions need Fabric API?
Do players need to install Custom Dimensions?
Which versions does Custom Dimensions support?
In the catalog
Custom Dimensions is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 8,071 mods support Minecraft 26.3.
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Similar mods
What the author says
Custom Dimensions is a fully server-side Fabric mod that lets server administrators create custom dimensions, define physical portal frames, and connect worlds with persistent two-way gateways. Players can join with an unmodified vanilla client. Only the server needs the mod and Fabric API.
Official listing
- Modrinth page
- modrinth.com/mod/custom-dimensions
- Owner
- Fabric Server Essentials
- Published
- 2026-05-08
- Updated on Modrinth
- 2026-10-06
- Facts verified
- 2026-10-15