Undo

Undo MOD

Undo is a Minecraft Fabric mod that gives players the ability to instantly revert any world-altering action with a single key press. Whether you accidentally destroyed a precious build, placed a block in the wrong spot, or toggled a door when you didn't mean to — just press Back, and your world is restored to its previous state.

The mod maintains a per-player history stack of up to 1,000 actions, automatically cleared when the player leaves the server or the session ends. Two operation modes are available: BLOCK_ONLY mode tracks simple block placements and destructions for lightweight performance, while FULL mode additionally captures BlockEntity NBT data, allowing complete restoration of complex blocks like chests, hoppers, and sign text.

Key Features:

Instant Undo — Press Back to revert the last action. Hold Shift+Alt+Back to undo everything in your history stack at once.

Mode Switching — Press U to open the in-game settings GUI and toggle between BLOCK_ONLY and FULL modes. Network Synchronized — Settings are synchronized between server and client via custom payload packets. Precise Capture — Block states and entity data are captured at the exact moment of change, ensuring nothing is lost.

Vanilla-Friendly — Built with Fabric API and Mixins, compatible with Fabric loader 0.16.5+ and Minecraft 1.21.1.

Sometimes, the best tool in your inventory is the Backspace key.