LockIn | The Ultimate Auth Plugin
The best authorization plugin. Fully customizable, optimized and functional.
Overview
LockIn plugin is an auth plugin that protects your Minecraft server from hackers.
Features
≻ IP based login sessions: Players wont have to login everytime they join.
≻ Protects player locations: Players are kept at the set auth location until they successfully log in.
≻ Hides player inventories: Player inventories are kept hidden until they successfully log in.
≻ No kicks on multi-login: Prevents players from being kicked when logged in from another location.
≻ Fully customizable: You can change literally ANYTHING in the config.yml.
Commands & Permissions
/register - Register with a password.
/login - Login with your password.
/changepass - Change your current password.
/unregister - Unregister an user's account.
/lockin reload - Reload the config.
/setauthlocation - Set the location where players are sent to log in or register.
Permissions: lockin.admin
Installation
- Drop the LockIn.jar into your /plugins folder.
- Restart or start the server.
- Just make sure to set an auth location using /setauthlocation aaand your done!
Dependencies
None!
Visuals
Showcase GIF: [CLICK HERE]
Support Server: https://discord.gg/XSp8z5xVPy
Please report bugs in the support server.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 1.21.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as LockIn-1.3.jar — drop this file into the mods folder
- Download size: 20 KB
- Download link checked 6 Sept 2026 — working
These come from our own check of the pack file, not from the source page.