---
title: "Minecraft 1.21.1 Forge | Prism Launcher"
description: "Create a Prism instance for Minecraft 1.21.1 on Forge. Use Java 21. Download Prism Launcher from /download."
canonical: https://prismlauncher.ink/loaders/1-21-1-forge
updated: 2026-10-17
---

# Minecraft 1.21.1 with Forge

Create a Prism instance for Minecraft 1.21.1 on Forge. Use Java 21.

## Facts (2026-10-17)

- **Minecraft:** 1.21.1
- **Loader:** Forge
- **Java:** Java 21

## 1.21.1 + Forge

Add Instance → 1.21.1 → install Forge. Assign Java 21 under Settings → Java.

This pairing existed for that version. Older versions are not given NeoForge or Quilt pages.

Installer: [/download](https://prismlauncher.ink/download).

## FAQ

### Which Java for 1.21.1?

Java 21. Mismatch is a common exit code 1.

## Related

- [Prism Launcher Mod Loaders](https://prismlauncher.ink/loaders)
- [Prism Launcher Java & JVM Configuration](https://prismlauncher.ink/java)
- [Fabric Loader in Prism Launcher](https://prismlauncher.ink/loaders/fabric-loader)
- [How to Set Up Fabric Loader in Prism Launcher](https://prismlauncher.ink/loaders/fabric-loader-setup-and-mods-guide)
- [NeoForge in Prism Launcher](https://prismlauncher.ink/loaders/neoforge-loader)

## Download

Free and open source: [Download Prism Launcher](https://prismlauncher.ink/download)

Markdown mirror: https://prismlauncher.ink/loaders/1-21-1-forge.md