Custom Biome Downloader
A mod used to save all biomes from a server, including custom ones! Can be used together with a world downloader to get a more accurate world!
About this Mod
How to Use the Mod:
Join any Minecraft server (with custom biomes registered via datapacks).
Run the command:
/save biomes- This command can be executed at any time after joining.
Check the output in chat.
- The mod will confirm the name of the file it
Output File:
- The biome data will be saved as a text file named:
<Server-IP>-BIOMES.txt - This file is located in your
.minecraft/config/
What It Does:
The mod scans and saves all server-side custom biome information + IDs.
Useful for mod or datapack developers who want to:
- Analyze custom biome data.
- Track which biomes a server is using.
Great to use in combination with:
Available Versions
How to Install Custom Biome Downloader on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.5).
Install Mod
Open the mod browser in the dashboard and search for "Custom Biome Downloader". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.5, 1.21.4
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Custom Biome Downloader server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.5). You can switch loaders with one click in the panel.
Is Custom Biome Downloader compatible with fabric?
Custom Biome Downloader officially supports fabric for Minecraft 1.21.5, 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Custom Biome Downloader – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Custom Biome Downloader consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Custom Biome Downloader with just one click on your server.