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How to Set Up Minecraft Forge in Prism Launcher

1 minHow-to
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Complete setup checklist for Minecraft Forge on Windows: version selection, Built-in Forge API, and shader/mod installation.

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Target Loader
Minecraft Forge
Supported Versions
1.1 – 1.20.1+
Required Library
Built-in Forge API

Step-by-step Minecraft Forge instance creation

  1. Launch Prism Launcher (available at /download) and click **Add Instance** on the top toolbar.
  2. Pick your target Minecraft version (1.1 – 1.20.1+) and select Minecraft Forge under the Mod Loader section, then click **OK**.
  3. Right-click the new instance → **Edit** → **Mods** → **Download mods** and install `Built-in Forge API` along with your favorite mods.
Prism Launcher screenshot showing the mod installation user-interface
Mods install straight from Modrinth and CurseForge.

Verifying Java and RAM before first launch

Open the **Settings** tab inside Edit Instance to confirm your Java installation matches the Minecraft version and set Maximum Memory to 4096 MiB (or 6144–8192 MiB for heavy mod lists).

If a newly added mod causes a crash, untick it in the **Mods** list without deleting the JAR file to test cleanly.

Frequently asked questions

Do I need to install Built-in Forge API manually?

When you use Prism Launcher's built-in **Download mods** browser, it automatically flags and queues required dependencies like Built-in Forge API.

Can I add shaders to this loader?

Yes. Install Iris Shaders (for Fabric/NeoForge) or Oculus (for Forge 1.20.1) in the Mods tab, then add your shaderpack ZIP in the Shader Packs tab.

Get Prism Launcher

Prism Launcher on Windows showing several modpacks and instances