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MobStackerMinecraft mod for 1.21.5

Greatly increases performance by stacking mobs together reducing the physical number of entities in the world with a config for further customization. Includes a mob cap module.

server onlynewest supported 1.21.5UtilityMobsWorldgenOptimization
Latest version
1.0.14
Minecraft
1.20.1 to 1.21.5
Java
Java 21+
Loaders
Fabric, Quilt, NeoForge, Forge
Licence
LGPL-3.0-only
Downloads
30.9k
Updated
17 mo ago
Available on
Modrinth
Space NodePartner

Host MobStacker servers

One click and MobStacker is installed with the right loader, on hardware built for it.

  • 1.21.5
  • Fabric
  • Quilt
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version MobStacker declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.5Fabric, Quilt, NeoForge, Forge21+declared25 Mar 2025
1.21.4Forge, Quilt, NeoForge, Fabric21+declared3 Dec 2024
1.21.4-pre1Forge, Quilt, NeoForge, Fabric21+declared20 Nov 2024
24w46aForge, Quilt, NeoForge, Fabric21+declared13 Nov 2024
24w45aForge, Quilt, NeoForge, Fabric21+declared6 Nov 2024
24w44aForge, Quilt, NeoForge, Fabric21+declared30 Oct 2024
1.21.3NeoForge, Quilt, Forge, Fabric21+declared23 Oct 2024
1.21.2Fabric, Quilt, NeoForge, Forge21+declared22 Oct 2024
1.21.2-pre5Forge, Quilt, NeoForge, Fabric21+declared16 Oct 2024
1.21.2-pre4Forge, Quilt, NeoForge, Fabric21+declared15 Oct 2024
1.21.2-pre3Forge, Quilt, NeoForge, Fabric21+declared11 Oct 2024
1.21.2-pre2Forge, Quilt, NeoForge, Fabric21+declared10 Oct 2024
1.21.2-pre1NeoForge, Quilt, Fabric, Forge21+declared8 Oct 2024
24w40aFabric, Forge, NeoForge, Quilt21+declared2 Oct 2024
24w39aFabric, Quilt, NeoForge, Forge21+declared25 Sept 2024
24w38aForge, Quilt, NeoForge, Fabric21+declared18 Sept 2024
24w37aForge, Quilt, NeoForge, Fabric21+declared11 Sept 2024
24w36aForge, Quilt, NeoForge, Fabric21+declared4 Sept 2024
24w35aForge, Quilt, NeoForge, Fabric21+declared28 Aug 2024
24w34aForge, Quilt, NeoForge, Fabric21+declared21 Aug 2024
24w33aFabric, Quilt, NeoForge, Forge21+declared15 Aug 2024
1.21.1Fabric, Quilt, NeoForge, Forge21+declared8 Aug 2024
1.21.1-rc1Forge, Quilt, NeoForge, Fabric21+declared7 Aug 2024
1.21Forge, Quilt, NeoForge, Fabric21+declared13 Jun 2024
1.20.4Forge, Quilt, NeoForge, Fabric17+declared7 Dec 2023
1.20.3Forge, Quilt, NeoForge, Fabric17+declared4 Dec 2023
1.20.2Forge, Quilt, NeoForge, Fabric17+declared20 Sept 2023
1.20.1Quilt, Forge, NeoForge, Fabric17+declared12 Jun 2023

Download

From MobStacker’s own host. Nothing is re-hosted here.

1.0.14release9 Apr 2025

mobstacker-1.21.5-fabric-1.0.14.jar · 0.0 MB · for 1.21.5

Download latest
0ed16863df8f…
Older versions13
  • 1.0.14b16 Mar 20251.21, 1.21.1, 1.21.20.1 MB5.3k downloadsd883ab6a2f86…Get
  • 1.0.1329 Dec 20241.21, 1.21.1, 1.21.20.1 MB2.0k downloads371e7b512841…Get
  • 1.0.127 Nov 20241.21.3, 24w44a, 24w45a, 24w46a, 1.21.4-pre10.0 MB101 downloads36809b0c3ba2…Get
  • 1.0.115 Nov 20241.21, 1.21.1, 1.21.2, 1.21.3, 24w44a0.1 MB1.2k downloadsfa71ec7e8caa…Get
  • 1.0.103 Nov 20241.21, 1.21.1, 1.21.2, 1.21.3, 24w44a0.1 MB68 downloads44a9117dca6d…Get
  • 1.0.927 Oct 20241.21, 1.21.1, 1.21.2, 1.21.30.1 MB117 downloads38a06b6eff2f…Get
  • 1.0.819 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.1 MB107 downloads695b83a5b5a4…Get
  • 1.0.717 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.0 MB68 downloads35acebc75e2a…Get
  • 1.0.6c14 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.0 MB70 downloads08245c9839ed…Get
  • 1.0.612 Oct 20241.20.1, 1.20.2, 1.20.3, 1.20.40.0 MB200 downloadsd079576153dc…Get
  • 1.0.5b12 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.0 MB82 downloads3b4196b33b82…Get
  • 1.0.511 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.0 MB61 downloads4daf51f17f46…Get
  • 1.0.411 Oct 20241.21, 1.21.1-rc1, 1.21.1, 24w33a, 24w34a0.0 MB63 downloads1a285f22b4c2…Get

Frequently asked

Does MobStacker work on Minecraft 1.21.5?

Yes. 1.21.5 is the newest Minecraft version MobStacker declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does MobStacker support?

Everything the author has declared, from 1.20.1 up to 1.21.5. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install MobStacker on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which loader does MobStacker need?

Fabric, Quilt, NeoForge, Forge. A build for one loader will not load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for MobStacker?

Java 21 or newer, because that is what the newest Minecraft release it supports requires. The requirement comes from the game rather than from the mod itself.

What licence is MobStacker under?

LGPL-3.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install MobStacker?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download MobStacker safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .