ModsFinder

UUID Fixer

by xkat

UUID Fixer gives players who join an offline-mode server the real Mojang UUID, so UUID-keyed mods and services work for them.

FabricServer-side onlyMIT LicenseOpen source26.2 – 26.3

What it does

On an offline-mode server, Minecraft assigns each player a UUID hashed from the username rather than the Mojang or Microsoft UUID, which breaks anything keyed by UUID, such as villager trading, reputation, tamed pets, advancements, player data, permission plugins and Essential. The mod looks up the joining player's real UUID through the Mojang API and uses it when an account exists. If the lookup fails, times out or finds no premium account, the server falls back to vanilla offline behavior, so nothing breaks. The mod is server-side only and is published for Fabric alone, in builds for 26.2 and 26.3, under the MIT License, and the code is open source.

Key features

  1. Real UUID assignment

    Players who join with a premium account receive their Mojang UUID instead of a hash of the username.

  2. Safe fallback

    When the lookup fails or times out, the player simply gets the normal offline UUID, so joining still works.

  3. Server-side install

    Only the server runs the mod, and players join without installing anything on their clients.

Compatibility

Latest build for each game version and loader.

26.326.3
26.226.2
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Online UUID Fix is a Fabric server-side mod for 1.21.11, released under the GNU General Public License v3.0 only and open source. Partial Online Mode is a server-side Fabric mod for 26.2 under the MIT License, not open source. Choose between them by version and license, since all three address the same offline UUID problem.

ModLoadersGame versionsEnvironmentUpdated
UUID FixerFabric26.2 – 26.3Server-side only2026-09-16
Online UUID FixFabric1.21.11Server-side only2026-03-25
Partial Online ModeFabric26.2Server-side only2026-07-24

In the catalog

UUID Fixer is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 8,071 mods support Minecraft 26.3.

Library mods3,514Fabric modsMods for 26.38,071

More from xkat

All projects
Custom Drops26.2 – 26.3

Similar mods

Fabric API1.14 – 26.3Cloth Config API1.14 – 26.3YetAnotherConfigLib (YACL)1.19 – 26.3Architectury API1.16.5 – 26.3Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3

What the author says

Without this, offline mode gives every player a UUID hashed from their username instead of their real Mojang/Microsoft UUID. That breaks anything keyed to UUID: villager trading reputation, tamed pets, advancements, playerdata, permission plugins, Essential, etc. This mod checks the Mojang API for each joining…
xkat, on the Modrinth page

Official listing

Owner
xkat
Published
2026-07-05
Updated on Modrinth
2026-09-16
Facts verified
2026-10-15

Tags

LibraryManagementUtility
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