Mob Mutator
by slolex
Mob Mutator lets a player tune the stats and behaviors of living entities, including players, from a graphical menu in the game.
What it does
Mob Mutator edits the properties of mobs and other entities in real time. Its menu is organized into tabs by category and opens with the M key by default. Changes apply directly in-game, and the menu can also edit properties added by other installed mods, since the mod works with the game's registry at runtime. Entities added by other mods are covered as well.
Mutations can be saved and loaded as profiles, and profiles can be tied to singleplayer world save folders. Vanilla parameters are restored when the game is exited. Developers can register custom properties through the included MobMutatorAPI, which syncs them across the network and generates an editor from a single line of code.
The mod is a NeoForge mod for 1.21.1 only, and it runs on the client and the server, so both need it. It is released under the MIT License but is not open source. Changing core attributes or AI behaviors can disrupt game difficulty and entity movement, so backing up the world first is advised.
Key features
Real-time editing
Mob properties can be changed interactively in-game, with the effects visible as soon as they are applied.
Multi-selection batch actions
Several mobs can be selected with checkmarks, then randomized or reset together in one action.
Detailed editor
Double-clicking a mob in the list opens its detailed editor directly.
Profile manager
Attribute presets can be saved and loaded quickly, with profiles stored alongside singleplayer world save folders.
Developer API
MobMutatorAPI lets other developers register custom properties that sync across the network.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want to experiment with mob stats in singleplayer or on a server, and developers who need a way to expose custom entity properties to an editor.
How it compares
CraftStats is a Fabric and NeoForge mod for 1.21 – 1.21.11, with the client and server environment and All rights reserved as its license, so it is not open source. Mob scale randomizer covers 1.21.1 – 1.21.11 on Fabric and NeoForge, is client and server, and is not open source either. Natural Sizes runs on Fabric, Forge and NeoForge for 1.19.2 – 26.3, is server-side only, and is All rights reserved, so players can join without installing it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mob Mutator | NeoForge | 1.21.1 | Client and server | 2026-05-28 |
| CraftStats | Fabric and NeoForge | 1.21 – 1.21.11 | Client and server | 2026-10-04 |
| Mob scale randomizer | Fabric and NeoForge | 1.21.1 – 1.21.11 | Client and server | 2026-06-19 |
| Natural Sizes | Fabric, Forge and NeoForge | 1.19.2 – 26.3 | Server-side only | 2026-10-14 |
Questions
Does Mob Mutator need to be installed on the server?
Can Mob Mutator edit mobs added by other mods?
Are mutations kept after the game is exited?
In the catalog
Mob Mutator is one of 11,058 Mobs mods on ModsFinder, and one of 4,974 Mobs mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from slolex
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What the author says
Mob Mutator is a utility for modifying, balancing, and randomizing the physical, attribute, behavioral, and fun properties of any living entity in Minecraft, including players. This mod is experimental, and its future support is uncertain. ## Warning! Modifying fundamental entity attributes and AI behaviors can lead…
Official listing
- Modrinth page
- modrinth.com/mod/mob-mutator
- Owner
- slolex
- Published
- 2026-05-28
- Updated on Modrinth
- 2026-05-28
- Facts verified
- 2026-10-15