SimpleAuth
by samolego
SimpleAuth adds a login step to Fabric and Forge servers, so players prove they own their account before they can play.
What it does
Players who join a server running SimpleAuth must register a password or log in with one before they can move or act. Until they do, movement is disabled, block interactions are blocked, and their inventory cannot be changed, dropped or moved. Coordinates are protected, and a player who logs in from another location is stopped from carrying on there.
Online UUIDs are used for players who bought Minecraft, so their accounts can log in automatically on later joins. Server owners can also set a global password, and the wiki describes the options in more detail. The mod is a server mod: players join without installing anything, and it is useful on any server that wants to keep accounts from being taken over.
SimpleAuth is published for Fabric and Forge across three release versions, 1.16.3 – 1.16.5, with 1.7.7 for 1.16.5 as the latest Fabric file and 1.7.6 for 1.16.5 as the latest Forge file. The Forge file is on the beta channel. The code is open source under the MIT License, and snapshot builds are published as well.
Key features
Registration and login
New players register a password, and returning players log in with it before any gameplay is allowed.
Automatic login for purchased accounts
Players whose accounts are tied to a purchased copy of Minecraft can be logged in automatically using online UUIDs.
Movement and block lock
Players who are not authenticated cannot move, and they are blocked from interacting with blocks until they log in.
Inventory and coordinate protection
While a player is unauthenticated, the inventory cannot be changed, items cannot be dropped, and coordinates stay hidden.
Global password option
The server owner can set one global password for the server instead of per-player passwords.
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
Use cases
Who it’s for: Server owners running Fabric or Forge servers who want a login step before players can play. Players only need the mod on the server side, so they join without installing anything.
How it compares
Simpler Auth is a Fabric-only server mod for 1.16.5 – 1.19 with the MIT License and open source. EasyAuth is also server-side only and open source under the MIT License, but it targets Fabric and Quilt for 1.17 – 26.3. Auto Login is a Fabric client-side mod for 1.21.11 – 26.3, so it does not provide a server login step.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SimpleAuth | Fabric and Forge | 1.16.3 – 1.16.5 | Server-side only | 2021-03-10 |
| Simpler Auth | Fabric | 1.16.5 – 1.19 | Server-side only | 2022-06-09 |
| EasyAuth | Fabric and Quilt | 1.17 – 26.3 | Server-side only | 2026-09-19 |
| Auto Login | Fabric | 1.21.11 – 26.3 | Client-side only | 2026-09-21 |
Questions
Does SimpleAuth have to be installed on the client?
Which loaders does SimpleAuth support?
Can purchased accounts skip the password?
In the catalog
SimpleAuth is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 5,992 mods support Minecraft 1.16.5.
More from samolego
Similar mods
What the author says
Do you have a server that you want to protect from unwanted visitors without using whitelist? Or need an extra form of authentication for players? This mod will come in handy then - it denies moving, destroying blocks etc. for players that aren't registered / logged in. It's possible to set a global password as well…
Official listing
- Modrinth page
- modrinth.com/mod/simpleauth
- Owner
- samolego
- Published
- 2020-10-26
- Updated on Modrinth
- 2021-03-10
- Facts verified
- 2026-10-15