Genesis - World Previewer & Pregenerator
by alkeari.dev
Genesis adds a world previewer and pregenerator to the Create New World screen, letting players inspect a seed's terrain before a world is built.
What it does
When the GENESIS button is opened on the Create New World screen, the mod samples the real world generator for the typed seed and draws a live biome map of the surroundings. Players can compare seeds side by side and see the terrain before ever spawning in. Leaving the screen writes the seed back into Create New World, so the chosen seed carries over.
Pregeneration works on an existing world as well. Players set a radius and a thread count, then track a progress readout with a rolling ETA for the active dimension.
Installation requires Architectury API, Cloth Config API and Fabric API on Fabric. Servers that run it need every player to install it too. The mod is published for Fabric, Forge and NeoForge with files for 1.20.1 and 1.21.1, under a custom license that is not open source.
Key features
Live biome preview
Typed seeds render a colored biome map, with 16 biome families sharing a fill color and each biome getting its own border color.
Seed tools
Seeds can be typed as numbers or text, rolled as RANDOM, copied to the clipboard, or rerolled with the R key.
Pan, zoom and measure
Drag to pan, scroll to zoom between NEAR, MID and FAR levels, and read a scale bar, a coordinate and the biome under the cursor.
Pregeneration with progress
Chunks are generated ahead of play for the active dimension, with a configurable radius and thread count and a rolling ETA.
Modded biome colors
Modded biomes get colors from their registry names, so they do not appear as anonymous gray areas.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 3
How it compares
Blocks Previewer is client-side only and open source under the MIT License, with files for 1.20.1 – 26.1.2 on Fabric, Forge and NeoForge, so it does not pregenerate chunks. Chunk Pregenerator is needed on the server, with the client optional, with its license restricted to non-commercial use without derivatives and files for 1.21.5 – 26.3. TFCGenViewer is open source under the MIT License, client and server, and covers Forge and NeoForge for 1.20.1 – 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Genesis - World Previewer & Pregenerator | Fabric, Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-09-06 |
| Blocks Previewer | Fabric, Forge and NeoForge | 1.20.1 – 26.1.2 | Client-side only | 2026-05-31 |
| Chunk Pregenerator | Fabric, Forge, NeoForge and Quilt | 1.21.5 – 26.3 | Server required, client optional | 2026-09-17 |
| TFCGenViewer | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2026-08-19 |
Questions
Does Genesis need Fabric API on every loader?
Does the server need Genesis to pregenerate chunks?
Are there version limits on the preview options?
In the catalog
Genesis - World Previewer & Pregenerator is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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What the author says
See the world before you make it. Genesis puts a live biome map, seed tools and world pre-generation on the Create New World screen, so you can compare seeds and pre-build the terrain before you ever spawn in. On NeoForge, edit config/genesis-client.toml. On Fabric, edit config/genesis.json or use any Cloth…
Official listing
- Owner
- alkeari.dev
- Published
- 2026-05-25
- Updated on Modrinth
- 2026-09-06
- Facts verified
- 2026-10-15