File Name- Fullbright-mod-fabric-1.21.4.jar !new! Page

: Most versions use a dedicated keybind—typically 'B' or 'G' —to instantly switch between normal brightness and full illumination.

If the game crashes on launch with an error about "incompatible mod set", you likely have a mod for Forge or a different version of Minecraft. If it says Forge or 1.20.1 , it will not work. File name- Fullbright-Mod-Fabric-1.21.4.jar

: Provides clean on-screen feedback when the effect is enabled or disabled. : Most versions use a dedicated keybind—typically 'B'

Since the file is named Fabric-1.21.4 , you must have Fabric installed. File name- Fullbright-Mod-Fabric-1.21.4.jar

Note: The mod does not add a keybind or settings screen by default. The effect is permanent while the mod is active.