How to Duplicate Items in Minecraft 1.21 (2025 Guide)
Disclaimer: This guide is for educational purposes only. Using glitches may violate server rules, cause game instability, or corrupt save files. Always back up your world before attempting these methods and check if they're allowed on your server.
As of Minecraft version 1.21, several item duplication glitches have been reported by the community. These methods work differently depending on whether you're playing Java Edition or Bedrock Edition. We've compiled the most reliable techniques for both versions.
Bedrock Edition Glitches
Working in Minecraft Bedrock 1.20.70 (2025)
Java Edition Glitches
Working in Minecraft Java 1.21.4 (2025)
BEDROCKBedrock Edition Duplication Methods
1. Shulker Box Duplication Glitch
This method allows you to duplicate any items stored inside a shulker box using a specific timing trick with pistons and redstone.
Materials Needed:
- 1 Shulker Box
- 2 Sticky Pistons
- 2 Regular Pistons
- Redstone Dust
- Redstone Repeaters
- Solid Blocks
- Items you want to duplicate
Step-by-Step Instructions:
- Build a platform and place your shulker box
- Fill the shulker box with items you want to duplicate
- Set up the pistons in a specific configuration where two sticky pistons face the shulker box
- Create a redstone circuit with precise timing using repeaters
- When activated, the pistons will cause the game to duplicate the shulker box
- Collect both shulker boxes, each containing the same items
Source: "ALL WORKING DUPLICATION GLITCHES for 1.21 MINECRAFT BEDROCK Edition" by James
2. Ender Chest Duplication Method
This method exploits a synchronization issue between the player inventory and ender chest storage.
Materials Needed:
- 1 Ender Chest
- Items you want to duplicate
- A second player (optional, makes it easier)
Step-by-Step Instructions:
- Place the ender chest and put the items you want to duplicate inside
- Have a second player ready to break the ender chest
- Open the ender chest and quickly move items to your inventory
- The second player should break the ender chest at the exact moment you take the items
- If timed correctly, the items will appear in both your inventory and remain in the ender chest when placed again
Source: "ALL WORKING DUPLICATION GLITCHES for 1.21 MINECRAFT BEDROCK Edition" by James
JAVAJava Edition Duplication Methods
1. Donkey/Llama Duplication Glitch
This method uses donkeys or llamas with chests to duplicate items by exploiting how the game saves entity data.
Materials Needed:
- 1 Donkey or Llama (tamed)
- 1 Chest to equip on the donkey/llama
- Items you want to duplicate
- Lead (optional)
Step-by-Step Instructions:
- Tame a donkey or llama and equip it with a chest
- Fill the chest with items you want to duplicate
- Save and quit the game
- Rejoin and quickly remove the items from the donkey/llama
- Without saving, force close the game (Alt+F4 or task manager)
- When you rejoin, the items should be in your inventory while also remaining in the donkey/llama
Source: "WORKING DUPLICATION GLITCHES in Minecraft 1.21.4 Java Edition!" video
2. Chunk Border Duplication
This method exploits how Minecraft loads chunks to duplicate blocks and items.
Materials Needed:
- Items you want to duplicate
- A chest or shulker box
- F3+G to see chunk borders (helpful)
Step-by-Step Instructions:
- Locate a chunk border (press F3+G to visualize)
- Place a chest exactly on the chunk border
- Fill the chest with items you want to duplicate
- Save and exit the world
- Use an external tool to modify the chunk data (advanced users only)
- When you reload, under specific conditions, the chest and its contents may be duplicated
Source: "WORKING DUPLICATION GLITCHES in Minecraft 1.21.4 Java Edition!" video
Risks and Considerations
- Game Stability: Duplication glitches can cause game crashes or world corruption. Always back up your world before attempting these methods.
- Server Rules: Most multiplayer servers prohibit the use of duplication glitches and may ban players who use them.
- Game Updates: Mojang regularly patches duplication glitches. Methods that work in version 1.21 may not work in future updates.
- Gameplay Experience: Unlimited items can diminish the survival experience that Minecraft was designed to provide.
Legitimate Alternatives
If you're looking for ways to get more items without using glitches, consider these legitimate alternatives:
Creative Mode
Switch to Creative mode for unlimited access to all items.
Commands
Use the /give command if you have operator permissions.
Mods
Install mods that add legitimate ways to duplicate items.
Efficient Farms
Build automatic farms for resources you need in large quantities.
Further Resources
For a comprehensive understanding of various duplication methods and their potential risks, you can consult the Minecraft Wiki's article on block and item duplication.
Video Tutorials:
Videos are embedded above in their respective sections.
Last updated: March 2025 for Minecraft version 1.21