Custom instance Icon

What does this mod do?

Custom Logo replaces the default Minecraft window icon — the one shown in your taskbar and title bar — with your own custom image.

No config files. No commands. Just drop a logo.png in your .minecraft folder and launch the game.

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How it works

This mod uses a Mixin that intercepts Minecraft's internal Window.setIcon() method before the vanilla icon is applied.

At startup, the mod:

1. Looks for logo.png in your .minecraft/ directory (or inside mods/ as a fallback)
2. Decodes the image using STBImage (already bundled with Minecraft via LWJGL — no extra dependencies)
3. Passes the image to GLFW to set the OS window icon
4. Cancels the vanilla icon so only your custom one is shown

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Installation

1. Download the .jar and place it in your mods/ folder
2. Place logo.png directly in your .minecraft/ folder

.minecraft/
├── mods/
│   └── custom-logo-x.x.x.jar
├── logo.png        <- here!
├── saves/
└── options.txt

Tip: You can also place logo.png inside the mods/ folder itself as an alternative.

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Image requirements

Property	Recommendation
Format	PNG with transparency (RGBA)
Size	32×32 or 64×64 px
Name	Must be exactly logo.png

Windows uses 16×16 and 32×32 for taskbar icons. A 32×32 or 64×64 image will be scaled automatically.

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Requirements

• Minecraft 1.21.1
• Fabric Loader 0.16.9+
• Fabric API

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Made by IamSboby