How do I install Cool Auth?

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. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Cool Auth work with?

The listing gives Minecraft 1.21, 1.21.1, 1.21.2, among others. This is the version stated by the author or source site, not something we verified ourselves.

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Cool Auth

by shanshanreal. · on Modrinth

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Bukkit1 build
Mod loader Paper1 build
Mod loader Purpur1 build
Mod loader Spigot1 build

Minecraft version

Minecraft 1.21.2–1.21.11Newest

Minecraft 1.21.2–1.21.11Newest

Minecraft 1.21.2–1.21.11Newest

Minecraft 1.21.2–1.21.11Newest

⬇ Download for 1.21.2–1.21.11 · Bukkit ⬇ Download for 1.21.2–1.21.11 · Paper ⬇ Download for 1.21.2–1.21.11 · Purpur ⬇ Download for 1.21.2–1.21.11 · Spigot

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

CoolAuth

CoolAuth is a lightweight, high-performance authentication plugin designed specifically for modern Minecraft 1.21+ servers. It provides essential security for offline-mode servers without the bloat of larger plugins.

Features

Optimized Performance: Built to be fast and minimal with very low resource usage.
Flexible Storage: Supports MySQL, MariaDB, SQLite, and YAML data storage out of the box.
Strong Security: Passwords are AES encrypted by default to ensure user safety.
Player Protection: Blocks movement, block breaking/placing, chat, and interactions until the player logs in.
User Friendly: Uses modern Title and Subtitle messages to guide players on join.
Timeout System: Automatically kicks players who do not authenticate within the configured time limit.

Commands

/register <password> — Register a new account.
/login <password> — Login to an existing account.
/coolauth reload — Reload the configuration and database connection.

Permissions

coolauth.admin — Required to use the reload command.

Configuration

The config.yml is fully customizable. You can toggle encryption, change the authentication timeout, edit all messages, and switch between database types effortlessly.

Quick facts

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.

Verified by MCModsHub

Ships as CoolAuth-2.0.3.jar — drop this file into the mods folder
Download size: 70 KB
Download link checked 22 Aug 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21