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DEUF - Duplicate Entity UUID FixMinecraft mod for 1.21.1

Changes UUIDs of loaded Entities in case their UUIDs are already assigned (and removes log spam).

newest supported release 1.21.1Server UtilityWorld GenCosmetic
Latest version
deuf-1.21.1-1.3.jar
Minecraft
1.12 to 1.21.1
Java
Java 21+
Loaders
Forge, NeoForge
Licence
not stated
Downloads
34.5M
Updated
5 mo ago
Available on
CurseForge

Minecraft versions

Every version DEUF - Duplicate Entity UUID Fix declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Forge, NeoForge21+declared8 Aug 2024
1.20.2NeoForge, Forge17+declared20 Sept 2023
1.20.1NeoForge, Forge17+declared12 Jun 2023
1.19.4NeoForge, Forge17+declared14 Mar 2023
1.19.3Forge, NeoForge17+declared7 Dec 2022
1.19.2NeoForge, Forge17+declared5 Aug 2022
1.19.1NeoForge, Forge17+declared27 Jul 2022
1.19Forge, NeoForge17+declared7 Jun 2022
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.16.5NeoForge, Forge8+declared14 Jan 2021
1.16.4Forge, NeoForge8+declared29 Oct 2020
1.16.3NeoForge, Forge8+declared10 Sept 2020
1.15.2NeoForge, Forge8+declared17 Jan 2020
1.15.1NeoForge, Forge8+declared16 Dec 2019
1.15NeoForge, Forge8+declared9 Dec 2019
1.12.2NeoForge, Forge8+declared18 Sept 2017
1.12.1NeoForge, Forge8+declared3 Aug 2017
1.12NeoForge, Forge8+declared2 Jun 2017

Download

From DEUF - Duplicate Entity UUID Fix’s own host. Nothing is re-hosted here.

Most recently published release

deuf-1.21.1-1.3.jarrelease4 Jun 2026

deuf-1.21.1-1.3.jar · 13 KB · for 1.21.1 · NeoForge

Download this release
8db4168b152f…
Older versions17
  • deuf-forge-1.20.2-1.3.jar15 Nov 20231.20.213 KB3.5k downloads9b511a797334…Get
  • deuf-1.20.2-1.3.jar15 Nov 20231.20.213 KB132 downloadse08aad54bada…Get
  • deuf-1.20.1-1.3.jar20 Jun 20231.20.113 KB11.6M downloads4f96406c6257…Get
  • deuf-1.19.4-1.3.jar28 Apr 20231.19.413 KB1.9k downloads991fc3189906…Get
  • deuf-1.19.3-1.3.jar1 Mar 20231.19.313 KB791 downloads569d5a575654…Get
  • deuf-1.19.2-1.3.jar10 Aug 20221.19.213 KB3.9M downloadsaedcc964323f…Get
  • deuf-1.19.1-1.3.jar28 Jul 20221.19.113 KB1.6k downloads10bf6b5e17f4…Get
  • deuf-1.18.2-1.3.jar23 Jul 20221.18.213 KB427.6k downloads24c024b36462…Get
  • deuf-1.19-1.3.jar23 Jul 20221.1913 KB286 downloadsc47be29fdcf9…Get
  • deuf-1.19-1.2.jar20 Jul 20221.1913 KB141 downloads86f0d3f08e73…Get
  • deuf-1.18.2-1.2.jar20 Jul 20221.18.213 KB209 downloadsabd55bc9df47…Get
  • deuf-1.16.5-1.1.jar19 Jul 20221.16.514 KB1.1M downloadsc1ab6affd98b…Get
  • deuf-1.16.4-1.1.jar24 Nov 20201.16.5, 1.16.414 KB197.2k downloads00975d7e7b88…Get
  • deuf-1.16.3-1.1.jar27 Sept 20201.16.34 KB709 downloadsad8d335a8da5…Get
  • deuf-1.15.2-1.1.jar27 Sept 20201.15.2, 1.15.1, 1.154 KB1.0k downloads3124bee506e8…Get
  • deuf-1.1-1.12.2.jar26 Jun 20181.12.2, 1.12.1, 1.126 KB1.3M downloads157152e76963…Get
  • deuf-1.0-1.12.2.jar23 Jun 20181.12.2, 1.12.1, 1.126 KB1.4k downloadsf1a7425b1e04…Get

Frequently asked

Does DEUF - Duplicate Entity UUID Fix work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version DEUF - Duplicate Entity UUID Fix 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 DEUF - Duplicate Entity UUID Fix support?

Everything the author has declared, from 1.12 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does DEUF - Duplicate Entity UUID Fix support?

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

Which Java version do I need for DEUF - Duplicate Entity UUID Fix?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install DEUF - Duplicate Entity UUID Fix?

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 DEUF - Duplicate Entity UUID Fix safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

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

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Details from CurseForge, where the author last updated it on 4 Jun 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .