Spawner Fix is a Fabric utility that bridges the gap between mob spawners and natural mob spawning.

By default, vanilla Minecraft limits mob spawners to a strict activation range of 16 blocks, meaning players have to stand right next to them. This mod removes that hardcoded limitation, adjusting the default activation range to match the standard vanilla range for natural mob spawning (128 blocks).

Highly Recommended for Singleplayer & Servers Alike: While it works flawlessly on dedicated servers, Spawner Fix is also fully compatible and highly recommended for Singleplayer worlds. Since it runs entirely on the internal server engine using native commands, it fits seamlessly into any standard survival playthrough without altering core world generation.

Whether you want to create massive custom farms, improve survival immersion, or tightly optimize performance, Spawner Fix puts the power back in your hands. It introduces simple, native /gamerule commands so you can dynamically scale both player activation ranges and horizontal spawn radiuses on the fly no restarts required.

• Zero Client Footprint: This is a 100% server-side mod. Install it on your server or your singleplayer world, and players can join without needing to install anything!
• Pure Vanilla Feel: No messy .toml or .json config files to edit. Everything is controlled seamlessly via standard, native Minecraft /gamerule commands.
• Dynamic Real-Time Tuning: Change activation distances or spawn radiuses instantly on the fly—your changes take effect immediately without requiring a single server restart.
• Smart Performance First: Built from the ground up with optimization in mind, ensuring zero unnecessary CPU overhead from idle or distant spawners.

Take total, global control over how spawners behave across your dimensions using these simple settings:

Game Rule	Default	Range	Description
spawner_player_range	128	0 – 10000	The maximum distance (in blocks) a player can be away before the spawner goes idle.
spawner_spawn_radius	4	0 – 10000	The horizontal block radius around the spawner where mobs are allowed to materialize.

# Match the natural mob spawning sphere (128 blocks)
/gamerule spawner_player_range 128

# Expand the horizontal area for massive custom mob farms
/gamerule spawner_spawn_radius 16

This project is licensed under the CC-BY-4.0 license. If you want to read the full legal details, click the button below: