Undo
by aaa6795
Undo lets players reverse recent world changes with a single key press, which helps when a block is placed or broken by accident.
What it does
Undo records block placements, breaks and state changes such as doors, trapdoors, levers and buttons, so each one can be reverted in order. Chain reactions triggered by block changes, including falling sand, vine growth, redstone updates and piston pushes, are captured as one undo operation. Chest contents, furnace progress and brewing stand recipes are restored along with the blocks.
Pressing U opens the vanilla settings screen, and the mouse side buttons toggle between undo modes that cover full blocks only or every change. A HUD display shows the number of undoable and redoable actions in real time. The mod is aimed at Creative mode builders who want to compare designs or go back to a previous state. Every player and the server need a copy of the mod. Fabric and Quilt builds cover 1.21.1 – 26.2, and the code is not open source, since it is released under the Creative Commons Attribution Non Commercial Share Alike 4.0 license.
Key features
Single-key undo
A single key press reverts the most recent world action, with redo available to restore it.
Block state restoration
Doors, trapdoors, levers and buttons return to their previous state when an action is undone.
Chain reaction capture
Changes triggered by other blocks, such as falling sand and piston pushes, are grouped into one operation.
Block entity restoration
Chest contents, furnace progress and brewing stand recipes come back with the reverted blocks.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Optional 1
Use cases
Who it’s for: Creative mode builders and players who often rearrange redstone or block layouts are the main audience. Server owners who want players to correct building mistakes will also find it useful.
How it compares
Ctrl+Z is a Fabric-only mod for 26.3 that runs client-side only and is open source under the MIT License, so it covers a single version and needs nothing on the server. Reden is open source under the GNU General Public License v3.0 only, with Fabric and Quilt files for 1.20 – 1.21.8, and either side can run it without needing it. Undo is not open source and is released under the Creative Commons Attribution Non Commercial Share Alike 4.0 license, so it must run on both the client and the server.
Questions
Does Undo need to be installed on the server?
Which loaders does Undo support?
Does Undo require any other mods?
In the catalog
Undo is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 13,894 mods support Minecraft 26.2.
More from aaa6795
Similar mods
What the author says
Undo Mod provides full Undo and Redo functionality for Minecraft Creative mode players. Whether you misplaced a block, demolished a build by accident, or want to compare different designs — go back to a previous state with a single keypress.
Official listing
- Modrinth page
- modrinth.com/mod/undo
- Owner
- aaa6795
- Published
- 2026-04-24
- Updated on Modrinth
- 2026-08-05
- Facts verified
- 2026-10-15