Tutorial:Block and item duplication/Outdated methodsShare article feedback

These no longer work as of the latest release of vanilla Minecraft, but worked on older versions.

Java Edition

Singleplayer

These are dupes that work(ed) only on singleplayer, either because you need access to manage the server, Paper/Spigot patches it, or a plugin is installed that patches it.

Alt + F4 Method (Patched 1.15)

This method is a simple method and has been around since Indev. This method involves dropping the items you want to duplicate, and then saving and quitting. You would then reload the world, pick up the items and press the keyboard shortcut to close a window. Then relaunch the game and reload the world. The items should be duplicated.

Multiplayer

These are dupes that only work on multiplayer, commonly because they exploit an anti-dupe plugin (like the thousands of donkey dupes)

Deadly Method (Patched 1.15)

This method is extremely deadly, but not necessarily to the player. This method involves taking a mob that can carry items (e.g. a zombie, a donkey or a llama) down to very low health (i.e. half a heart or less). Using extremely precise timing, kill that mob as it travels through an end portal or nether portal. The items equipped and the mob should appear in the other dimension. It works by tricking the game into thinking the mob is alive on one end of the portal and dead on the other side. The live mob will travel through the portal still carrying the items, and the dead mob's items are also sent into the portal, allowing the player at the other end to collect the cloned items and the mob carrying them.

The deadly method used to automatically farm diamonds (currently the fastest theoretical means of automatically obtaining items in vanilla survival):

Same Player Twice (Patched in virtually every server)

There is a way to trick the game into logging in the same player twice on one server. To do this, start two instances of Minecraft. This requires starting a new instance of the Launcher so that they don’t interfere with each other. Log them both on the same server at the same time. By doing this, the game will render two of the same player. You can then kill the copied player and double your inventory. Rarely servers may also duplicate players on accident or leave "ghosts" of logged out players which can be killed for the same effect.

Donkey Inventory Oversight (Patched in 20w16a and in Paper/Spigot 1.15.2)

Working in 1.15.2 and in 1.16 snapshots up to 20w12a (Patched in 20w16a and in paper). You need a tamed donkey or llama equipped with a chest. If a player shift-clicks the donkey / llama, that player may view the donkey's inventory and place items. If a second player rides the donkey, the first player will continue to view the donkey's /llama's inventory, even though it is not normally possible to view a donkey's inventory when it is already being ridden by a player. If the second player disconnects, the donkey will disappear along with them, and the donkey's inventory will be considered by the game as part of that player's data. However, the game will keep a copy of the donkey's inventory and GUI temporarily loaded for the first player, who can then reclaim the items. When the second player reconnects, the donkey's inventory will contain what was originally in it before the second player disconnected. The items can once again be taken from the donkey's inventory, resulting in x2 duplication.

Both

These dupes work(ed) everywhere! Servers that don't use anti-dupe plugins, singleplayer, etc.

Bundle Duplication (20w45a to 20w48a)

For any crafting recipe that uses more than 1 of the same item, you can use this dupe. To use it, you put the items in the crafting grid, then use the bundles on the crafting slot. The resulting item will not disappear but you will save the item you just took from a bundle. For example, if you used 9 stacks of netherite ingots to make 1 stack of netherite blocks, you could use 9 bundles to take all the netherite away and get 1 stack of netherite blocks for no cost.

Baby Piglin Item Dupe (Patched in 1.16.3)

This dupe involves baby piglins. It is incredibly simple and it works in multiplayer. To perform this glitch find a baby piglin and drop his health down to a 1-hit kill (2 hits with a normal diamond sword should work). Then drop the item you want to duplicate to the piglin(e.g. a shulker box) then wait for the baby piglin to pick it up. After the piglin has picked up the item drop the piglin 1 gold ingot. While the piglin is admiring the gold, kill the piglin.

Zombie/Drowned Method (Patched)

This method exploits the fact that zombies can transform into drowned while they are dying. If you coax a zombie to pick up an item by throwing one at it and then kill it right at the moment that it converts to a drowned, the zombie will die and drop what it was holding but the newly spawned drowned will be holding a duplicate of the item. This can also work with husks transforming into zombies.

Ilmango shows a simple implementation for survival:

Chunk memory overflow (Patched 1.15)

When you overflow chunk memory, you will be able to freeze the chunk. What this means is that changes on this chunk will not be saved and after loading it again it will return to the previous state. The best way to do this is to create books filled with about fifty pages of random Unicode characters and put it in a chest. There are mods for doing this automatically, but you can also do it manually by copying and pasting. You will need two different types of books for this to work.

1. Choose a chunk in which you want to duplicate and do everything only in this chunk (Press F3 + G to see chunk borders).
2. Get 22 books filled with random characters, name them "X" and 21 filled books but with other characters, name them "Y".
3. Place a chest and put the items you want to duplicate inside it.
4. Place a chest at the same chunk and put them in this pattern:

   X|Y|X|Y|X|Y|X|Y|X

   Y|X|Y|X|Y|X|Y|X|Y

   X|Y|X|Y|X|Y|X|Y|X

   • You will have 8 books of each type left.
5. Place a chest above it and put 8 of book X in slot 1 and 8 of book Y in slot 2 in that chest.
6. Reload chunk by reconnecting to the world(if you are on singleplayer) or going 200-300 blocks away and returning(if you are on multiplayer)
7. Move books from the second chest like this:

   X|Y|X|Y|X|Y|X|Y|X

   Y|X|Y|X|Y|X|Y

8. Take out the items you wanted to duplicate into your inventory or put them in a chest at the other chunk.
9. Reload chunk again.
10. Now you have your item(s) in the chest and in your inventory. Books in a second chest are just like in [4].

In 1.14+:

1. Press F3+G to see the chunk border.
2. Place a chest in the chunk that you want to duplicate, then place another chest above it.
3. Then, put the items that you wanted to duplicate in the upper chest.
4. After that, put 5 book and quills that filled in with 100 pages of random unicode characters in the bottom chest like this.

   X = 1 book; Y = stack of 2 books

   X|X|X|Y|

5. After that, press esc and select 'Save and Quit to title' to save the chunk (If you're in singleplayer) or walk 400 blocks away from the chunk (If you're in multiplayer, make sure of the other players were stayed in the nether else the duplication won't work). This method will save the chunk.
6. Then, log-in your world again (If you're in singleplayer) or walk back to the chunk (If you're in multiplayer).
7. Open the bottom chest and move the books like this:

   X|X|X|X|X|

8. Take your items away from the upper chest and move them to your inventory or put them in a chest at the other chunk.
9. Save that chunk again.
10. Go back to the chunk again.
11. Your items will reappear in the upper chest. The books will be reverted to the state in step 4. Duplication complete.

Discovered by Earthcomputer:

Tutorial on YouTube by BarrenDome:

Dropped Items (patched 1.13)

Relogging at the same time as you drop items can dupe items. Needs very precise timing; exit the second you see the items but before you hear the sound of collecting items.

Piston Duplication (patched 1.13)

When an item frame is removed (broken by the player) from the rear of a piston as the piston is retracting, the correct timing will yield two items of the item that was within the frame. This will work with any blocks or items inside of the frame, with shulker boxes being able to duplicate multiple items at once. This method works in both singleplayer and multiplayer game modes.

Crafting Dupe (Patched 1.12.1)

This method can also be used to stack unstackable items, such as diamond swords.

1. Put 2-3 stacks of planks in your inventory.

2. Drop the item that you want to dupe on the ground. (Make sure that there is no item that it can stack within your inventory!)

3. Open your inventory and spam the crafting table recipe until you pick up the item you dropped. It should result in a stack of that item.

Using Dolphins(Patched 1.17-pre2)

Put a dolphin in a nether portal as it absorbs an item. The original item will still be there, while the dolphin will carry a copy.

Renaming Duplication Glitch (patched 1.17.1)

Fill your inventory with items. Repeatedly rename the item you want to duplicate on an anvil until the anvil breaks. When it does, you will drop double the renamed item. If it is not working look at how it's being done in this video: https://youtube.com/watch?v=oSdwwxBgWco (Original Finder)

Enchanted Book Method (24w09a)

This method is similar to Chunk memory overflow for 1.14+ singleplayer, with the following differences:

• For step 4, put two curse of vanishing enchanted books instead of the book and quills.
• For step 7, take the enchanted books, combine them in a grindstone, and move them to your inventory and then to the bottom chest by ⇧ Shift+ clicking.

Dual edge tripwire hook duplication (17w18a to 17w46a, 1.13-pre7 to 22w12a)

Java version range	Mod patched?
17w18a - 17w46a, 1.13-pre7 - 22w12a	Paper ~1.17.1, Carpet Fixes

A dual edge tripwire hook duplicator has an unstable active hook, and transmits a block update from the passive hook to it to let it drop on both edges. Methods of triggering tripwire are the same as those for single edge duplications.

From 1.12-pre1 to 19w12b, this is the only known way to duplicate tripwire hooks. Moreover, the passive hook is unattached after duplication, and duplication occurs whenever the active hook tries to update the states of the passive hook. Thus, a duplicator produces a hook once the active hook is updated whether by any of the tripwire blocks or by its own scheduled tick. This mechanism does not exist in single edge duplicators because the active hook gives a signal to the door that it is attached to, allowing the passive hook to become attached without duplication.

By 22w13a, except in some april fool versions, there has been no known constructable contraption that transmits dual edge updates from the passive hook to the unstable active hook.

There are four structures of dual edge tripwire hook duplicators.

Two-block update duplicator (17w18a to 17w46a)

W				E

Completed two-block update duplicator in EW direction

Before the flattening, redstone wire updates unstable hooks two blocks away. The redstone wire must be placed before obtaining the unstable hook. The first tripwire block on the west must never be triggered. To prevent products from triggering it, a hopper minecart is used to pick up them.

Upward update duplicator (1.13-pre7 to 22w12a)

W			E

Completed upward update duplicator in EW direction

This duplicator updates the unstable hook with obliquely upward PP updates of redstone wire. Here are methods to place the redstone wire without breaking the unstable hook. If neither is available, first place the redstone wire, then get the unstable hook using TNT, and move the primed TNT away before it explodes.

W			E

Upward update duplicator prepared to duplicate in EW direction

Conductor obstructing oblique PP update (1.13-pre7 only)

1. Place the redstone wire block that updates the unstable hook on a conductor, and place a trapdoor or fence gate under this hook.
2. Place the lowest redstone wire block after that.
3. The former redstone wire won't point to the hook until the duplicator starts, after which you can remove the trapdoor or fence gate.

Extra dust fixing block state (20w18a to 22w12a)

1. Place the redstone wire straightly, without the hollow.
2. Extend the wire on the side where the unstable hook is by 1 block.
3. Lower the redstone wire block at the hollow by 1 block to create the hollow. The next wire block on the side of the unstable hook does not change its shape because of the extra wire block.
4. Now you can remove the extra dust.

Downward update duplicator (19w13a to 20w09a)

The observer placed in step 3 that will be moved onto the unstable hook by a piston when activating, used to redirect redstone wire on the other observer when the dropper updates it. Redstone wire placed earlier is also shown.

QC activation of the sticky piston and the dropper.

Completed duplicator without the redundant blocks.

This duplicator has the active hook placed on an observer, and updates the unstable hook with obliquely downward PP updates of redstone wire on the observer. This structure prevents products from being caught by redstone wire under the hook. Here are steps to build one.

1. Place the passive hook (on east or north, facing west or south).
2. Connect a redstone wire horizontally next to where the tripwire ciruit will be, from the passive hook to the place for the active hook, and extend it 1 block higher by 1 block on the active hook side.
3. Place an observer that will be moved onto the unstable hook by a piston when activating.
4. Place a not interactable block under the place for the active hook if there has not been one.
5. Place another observer with its back to the redstone wire on the not interactive block.
6. Place a sticky piston facing this observer seperated by the place for it to be retracted to, update-QC-activate it, and update it.
   • The sticky piston will grab the observer.
7. Deactivate the sticky piston, without updating it.
8. Place a dropper 2 blocks higher than the place for the observer.
9. Place another tripwire hook in front of the grabbed observer. The observer will be retracted, freeing the place for the active hook. Place that hook after 1 to 3 game ticks.
   • If failing to place the active hook, activate, update and deactivate the sticky piston again, and try again. You can update the observer by breaking the hook placed last time.
10. Move the two redstone wire blocks beside the unstable hook and the tripwire block next to it 1 block higher.
11. Place a redstone wire block on the observer supporting the unstable hook.
12. Update the other observer placed earlier.
13. Update-QC-activate the dropper.
14. Place tripwire to complete the tripwire circuit.
15. You can remove the pistons, the dropper and the redstone components used for QC and activating the piston that pushes the observer onto the unstable hook.
    • Do not break or trigger any of the observers.

Fence update duplicator (23w13a or b and 24w14potato)

E			W

Fence update duplicator in EW direction

Tripwire hooks placed on fences, iron bars, walls and glass panes are simply updated when these blocks update their shapes, which can be controlled by activating and deactivating doors or trapdoors. However, it is only possible to place hooks on them in these april fool versions.

Fast click tripwire hook duplication (17w18a, 17w18b, 20w18a to 1.20-pre1)

Java version range	Mod patched?
17w18a, 17w18b, 20w18a - 1.20-pre1	Paper ~1.17.1, Carpet Fixes

When a tripwire hook is placed in one of these duplicators, it pops the hook off, dropping two hooks, and resets immediately. This allows duplicating infinitely fast with a fast click tool, which is described as hook explosion. This is useful for producing fillings.

Using stairs (17w18a and 17w18b)

Fast click tripwire hook duplicator using stairs. Put your hook at the position of the lime wool.

When creating an unstable hook, it is not wanted that the tripwire block next to it updates it. Here in contrast, this happens to help to pop the hook off.

Using doors (20w18a to 1.20-pre1)

The tripwire must be in NS direction. If the hook to duplicate is placed on the bottom half of the door, the activator rail must be oblique.

This duplicator requires the hook to duplicate (referred to as the active hook) to be placed on a door, and controls the door.

To duplicate, an update is required from the passive hook, so the tripwire should be triggered, so that when the active hook is placed, the passive hook sends a signal, which can be transmitted with redstone wire. Thus, since the active hook will also be activated, there is no way to pop it off if the door (same for trapdoors) has been activated. Therefore, to deactivate the door, a falling edge is required when the update from the passive hook comes. The only way toward this is using a trapdoor to redirect redstone wire (the passive hook does not send a falling edge, as it is not updated when the active hook drops while the passive hook is updating).

In this duplicator, when the passive hook updates, the activator rail updates the trapdoor twice, which sends a pulse to the door for it to pop the active hook off, duplicating it, and reset. When the active hook updates, the door pops it off, but it cannot reset then, because an update residues at the other half of the door, which will open the door again. Therefore, an extra redstone wire block is used to supplement two updates for the door to reset.

Tripwire duplication

Java version range	Mod patched?
14w25a to 24w35a	Paper ~1.20.4, Carpet Fixes

Tripwire (string) duplication produces infinite string, which is often used for trading with fishermen, fletchers and shepherds. Some tripwrie duplicators also work as clocks.

When a tripwire block between two opposite tripwire hooks within 41 blocks and connected to the active hook (the west or south one) is broken, an overpowered or powerless tripwire block generates if the active hook immediately toggles the attached state of the hook and tripwire blocks. Generally, tripwire block in a connected tripwire circuit is not duplicated when being broken, because the active hook considers the circuit to be still connected, and updates 10 game ticks later. However, the hook responds immediately in the following cases:

• When the passive (east or north) hook breaks itself by activating or deactivating the door, trapdoor or TNT that it is placed on when updating, the active hook is still attached, and will respond when updated by tripwire.
• The hook is updated by tripwire connected to it during the 10 game ticks.
• The hook immediately sets the blocks as unattached when updated by disarmed tripwire, and sets them as attached again when updated by armed tripwire if the tripwire circuit is valid.

Tripwire may be duplicated if broken in these ways:

• Flushed by water. This is the most common.
• Broken by wither when it takes damage. This is quite simple, and involves no risk of duplicating out of control in a non-entity-ticking chunk.
• Broken by explosion. This is rare because it is difficult to control the order in which multiple tripwire blocks are dynamited.

Tripwire broken by hand or by lava can produce overpowered or powerless tripwire, but does not drop then. A piston devours the generated overpowered or powerless tripwire when breaking tripwire.

Classification

This section is focused on tripwire duplication by water, and puts current methods into four classifications, mostly according to how to trigger the active hook, compared in the table:

• Break-hook duplication—breaking tripwire left to be attached to the active hook by the passive hook when this hook breaks itself.
• Break-wire duplication—breaking tripwire connected to the active hook within 10 game ticks after breaking other tripwire.
• Falling edge duplication—breaking disarmed tripwire in connected tripwire circuits only.
• Dual edge duplication—breaking both disarmed and armed tripwire, switching the circuits disconnected and connected.

Method	Java version range	Mod patched?	Player operation	Minimum initial string	Shearing
Break-hook duplication	19w13a to 24w35a	Paper ~1.18.2, Carpet Fixes	Place and trigger tripwire	1	Unneeded
Break-wire duplication	14w25a to 24w35a	Paper ~1.18.2, Carpet Fixes	Place	2	Unneeded
Falling edge duplication	18w10d to 1.21.1	Forge and China Edition ~1.16.5, Paper ~1.20.4, Carpet Fixes	Unneeded	1	Needed
Dual edge duplication	18w10d to 1.21.1	Forge and China Edition ~1.16.5, Paper ~1.18.2, Carpet Fixes	Unneeded	2	Needed

Dual edge duplication is optimum in an appropriate version with enough materials. If shearing tripwire is unavailable, break-wire duplication is usually preferable. Break-hook duplication is useful for producing a second string item with one. Falling edge duplication is useful in servers that only support it (usually Paper).

Break-hook duplication

The tripwire circuit of a break-hook duplicator requires its passive hook (on east or north) placed on a door, and a third hook behind it. If you only have two hooks, dupe one. Water is required to flush the tripwire within 10 game ticks after you trigger it, for which you can BUD water or use close loop control. Corresponding duplicators are shown in the gallery. They produce the second string item when you trigger the tripwire. Close loop control is reusable, where you can place the broken hook back and dupe again.

• 

  BUD by digging a second pit. Dig the pit under the tripwire last.

• 

  BUD by placing stairs. Place the stairs last.

• 

  Using close loop control.

Break-wire duplication

This section introduces two generations of duplicators. The first generation (14w25a+) produce 4850 to 5600 string items per hour. The second generation (18w10d+) produce 14400 or 28800 (crossed) per hour with no need for external tools.

The first generation duplicator.

First generation

• Structure
  • A tripwire circuit with two tripwire blocks flushed by water. Water is directed to a pit under the tripwire, so it does not flush the hooks. The water source is preferably placed on the farther side from you, in order to carry products toward you.
• Additional blocks
  • The sign is used to avoid placing tripwire one block higher and block your crosshair.
  • Duplication succeeds only if the left tripwire block is not triggered (except by a player moving (including auto jump)) after the water has flushed one. The trapdoor and the chest provide a place to stand as close as possible to the tripwire, in order to pick up products quickly. These blocks are optional, but do not step on the tripwire anyway.
• Operation
  • Stand on the east or north, and place tripwire blocks targeting the side facing you of the farther (west or south) tripwire block continuously. Target the side of its attached (flat) hitbox.

Using upstream control.

Using downstream control.

Crossed duplicator. The conduits represent not flushable blocks.

Second generation

• Structure
  • A tripwire circuit with one tripwire block flushed by water on east or north and another under close loop control on west or south. The existing tripwire can be triggered by an entity or overpowering. The schematic and the screenshots includes duplicators using upstream and downstream close loop control, and a crossed version.
    • Do not add waterlogged blocks carelessly. They may ignore necessary updates.
• Updater
  • The updater is a redstone component used to transmit an update from the passive hook to the uncontrolled water. It is represented by a note block in the schematic and the screenshot. Different updaters may be used for different cases:
    • For upstream control from 1.13-pre7 to 22w11a, the updater is unnecessary.
    • For upstream control in the other versions, it can be a note block, a bell, or redstone wire (on the conductive attachment of the passive hook).
    • For upstream control with a water source above the east or north tripwire, options include the components above, a trapdoor, a fence gate, a dropper, a dispenser, a hopper, a crafter, and a head.
    • For downstream control, options include all the components above (redstone wire next to the conductive attachedment of the passive hook), a door, an activator rail, and a powered rail.
    • For the crossed one, redstone wire is used.
• Operation
  • Place the flushed tripwire back continuously.
    • Choose a proper angle to avoid placing tripwire elsewhere.
• Additional application
  • These duplicators can be used to produce overpowered tripwire.
    • Selectively triggering the existing tripwire, it has an approximately half chance to become overpowered in one duplication.
    • If you extend the tripwire, trigger the additional part, and then dupe, the prior existing tripwire will become overpowered.

Falling edge duplication

An accelerated duplicator. The spruce trapdoor is the switch. The tripwire block next to it is disarmed.

An expanded duplicator with two units.

Falling edge tripwire duplication is simply letting water flush disarmed tripwire under open loop (by a clock) or close loop control. This control is required because the tripwire circuit becomes disconnected after duplicating a disarmed tripwire block, and the tripwire will be broken if the water flushes the tripwire again too soon. This section is focused on close loop control. Compared to open loop, close loop requires at least one entity to trigger the tripwire and more complex product transport equipment, while redstone dust is unnecessary for it, and it can be accelerated to a larger output.

The following part lists techniques to make a close loop falling edge duplicator faster and larger.

Acceleration

• Selectively triggering at least 2 additional tripwire blocks in the tripwire circuit accelerates the duplicator from duplicating every 15 game ticks to every 5 game ticks.

Expansion

• You can assemble multiple units into an expanded duplicator with these steps:
  • For the first unit, direct PP updates from one of the hooks to the water source.
  • Connect the switch of the second unit to one of the hooks of the first unit at a position updated later than its own water source.
  • Connect more units in this way. The update order is no longer required.

Dual edge duplication

These duplicators usually belong to three scales. In this section, they are called the strand scale, the interface scale, and the expanded scale. Here the interface refers to the continuous interface between water and tripwire through which the water can flow so that the tripwire is duplicated, and the strand refers to 1m² of the interface. This section is focused on interface scale dupers, which meet demands up to 14 strands.

Obviously, the primary issue for a duper is the control of whether the water flushes the tripwire. At the interface scale, another issue is the control of the order in which the strands duplicate. While the duplicator is running the order is no issue, because the water is first updated by the tripwire, and the order of its scheduled ticks is generally from west to east or from south to north. On the other hand, to connect and disconnect the tripwire alternately, the tripwire blocks should be disarmed and armed alternately in the corresponding direction, and the starting update order should fit them. Nevertheless, once the former issue is addressed, there are always solutions to the latter.

There have been three patterns of controlling whether the water flushes:

• Source control—placing and removing a shared water source. There are dupers that place and remove a water source for each strand, but they are not involved here.
• Upstream control—controlling whether the water is able to flow toward the tripwire by trapdoors or pistons.
• Downstream control—letting the water and the tripwire contact each other, while using a downstream switch to control what directions the water flows toward.

Early dual edge duplicators use upstream control, discharging water and setting the update order through redstone circuits. Despite some advantages such as starting faster, the redstone circuits have proved unnecessary for both uses. This section is focused on the other two patterns, which need no redstone dust at the interface scale. Compared to source control, downstream control is slightly more complex, but starts and stops faster. Therefore, it is recommended to select source control dupers for short-term uses and downstream control dupers for long-term.

Duplicators of both methods require that there are no detectable pits nearby. You can avoid this concern by digging out room for dupers underground.

Source control dupers

• Two of these dupers are shown in the schematics. The large one forces the water source to flow south and not north when it is placed, so that the water then flushes the tripwire from south to north. Though these dupers cannot be rotated, these two allow up and down (in the top view) mirroring.
• The meanings of the blocks in the schematic:
  • Water—any water source or 8 level flowing water, whether placed with a water bucket or drawn from natural water.
  • Gold blocks—non-flushable blocks.
  • Shears on tripwire—these tripwire blocks are disarmed.

N			S

A small source control duper.

N									S

A large source control duper. To stop, fill (not collect) the water block.

Downstream control dupers

Using a downstream switch consisting of two well covers. The stone bricks stand for not flushable blocks.

• A downstream switch is usually one or more well covers (waterlogged top trapdoors under upstream water), from which the water can be extended to a maximum of 5 blocks on two opposite sides.
  • To guarantee a starting timing that ends with connection, the switch usually contains a redstone component such as a lever, a button, a redstone torch and redstone wire that charges a conductive block, in order to update 2 or 4 water blocks when starting. The screenshot shows one of these dupers with a lever.
  • Under extreme conditions, especially in difficult Skyblocks, these components can be unavailable. Fortunately, a single well cover still works. However, selective triggering or close loop control is required for matching the end of the start and the start of the second round.

Bedrock Edition

To use the following methods, you will have to either not update past that point or revert to a previous update (if possible for your system, not all can, such as on Xbox One or Nintendo Switch).

Fortune on Flowers (Patched in 1.20.70)

This can be used to duplicate any 2 block tall flower.

Steps:

1: Get an item with Fortune (level 3 works best) and a 2 block tall flower.

2: Place the 2 block tall flower.

3: Break said flower.

The flowers should have at least duplicated. The player could get up to 6!

Gravity Block Duplication (Patched on 1.16.200)

Duplicates all gravity-affected block except dragon eggs

This video will explain how to duplicate any gravity-affected block. It works similarly to gravity block duplicators in Java Edition: by having a falling block enter an end portal and become a block on the same tick.

The reason this design does not work for dragon eggs is that it relies on pistons being able to push blocks into their original position. This allows for the block to be duplicated repeatedly, every 6 redstone ticks. However, one can manually duplicate dragon eggs with a similar process:

G	D
P

In the above diagram, the G, D, and P denotes the grindstone, dragon egg, and portal, respectively. The repeater is necessary for the timing to work correctly, due to MCPE-15793. Like the automatic gravity block duplicator, one must use huge mushrooms to replace the End portal frames.

To use, deactivate the lever, and a second dragon egg will appear in The End. You can then re-activate the lever to break the dragon egg and place another one. This design can be used for other gravity blocks, but the automatic version is generally more efficient.

Another alternative to end portal based duping is end gateway based duping, however, it is not as fast as end portal based duping.

Anvil Duplication (Patched in 1.16)

You will need two book & quill and an anvil. Write any text in one book & quill, and sign it. From then, copy the first book & quill by placing them next to each other in the crafting grid. Take the item you wish to duplicate and rename it to the name of the copied book. From here, you can shift-click the anvil result and duplicate your item.

Anvil Naming (Versions 1.5.1-1.16.0) (Patched)

When naming a stack of items in an anvil, you can use the "Take Half" option to receive the output items without depleting the original stack. As long as you do not take the final renamed item, you can go to the original stack and pick it up to start more or just leave the anvil interface if you are done.

• A way to speed this up is to hit "Take Half", then "Toss Item" while standing close to the anvil, so you can rapidly go through a full stack without having to manually move each selection.

Items duplicated this way won't work for quick use in a recipe, though certainly can be used for Classic crafting and any other use. However, if you wish to revert an item to the default name, you can do so by crafting it into another item then crafting it back to the original (such as redstone block -> redstone dust x9 -> redstone block), or by placing it as a block then breaking it back into an item.

• Sometimes a block won't lose its name when broken into an item, such as shulker boxes which are meant to keep their name, or just randomly the name may stay with a regular block and repeating the process will remove the name. However, some items may break into different items, such as an ender chest dropping obsidian, and the obsidian will each retain the ender chest's name (this was likely a glitch).
• TNT Duplication
• 1. Put a TNT anywhere
• 2.Put a chest aside the TNT
• 3.Put the item that you want to duplicate in the chest
• 3.Light the TNT and at the same time the TNT explodes take out the item in the chest(this requires correct timing and good armor if you want to stay alive after the explosion)

Donkey + Looting sword (patched 1.16)

1. Get a donkey

2. Get a Looting 3 sword

3. Put a chest on the donkey

4. Put your items in that chest

5. Kill the donkey

The Looting 3 sword causes the donkey to drop more items than normal.

https://www.reddit.com/r/Minecraft/comments/g2k25b/this_bug_is_awesome_to_duplicate_your_items_put

Piston Chest (Patched in 1.16)

(Duplicates all Items)

When a chest is pushed by a piston, the contents are backed up a split second before it is moved. If you are in the chest interface and quick-move an item to your inventory in that moment then you will receive the item and the chest will be moved with the item still in it as well.

The recommended build is not automatic. For the recommended build, you will need at least 1 lever, 1 sticky piston, a chest, 10 redstone repeaters (all set to maximum delay), 2 redstone dust, and a button, though there are simpler(thus cheaper) versions that require only a sticky piston, a chest and a button. The instructions are as follows:

The "simple" method of the piston dupe machine. It follows the same instructions as the more expensive, recommended method but uses less blocks.

1. Press the button.
2. Wait until the piston pushes the chest.
3. Open the chest, and immediately put your cursor on the block.
4. At the last second, shift-click on the item you want to dupe.

The "recommended" build of the Bedrock Edition piston-chest dupe method.

If done correctly, you should have an identical copy of the item you put in.

• If you can not afford to make a sticky piston, this method also works with one regular piston on each side. One piston pushes the chest, and then you open it. You then continue as normal, shift-clicking the item at the last second before the other piston pushes the chest back to it's starting position.

• This method makes mass-duplication possible with the use of a shulker box and moving the contents of one duplicated box to the other, thus doubling how much you get each time, until you are duplicating an entire box's worth of items.
  • This does run the risk of massive lag in your world, by creating too many shulker boxes with contents. The effect may be even greater in online worlds such as realm servers. Be sure to transfer most items to regular chests after duplicating to avoid this.

Rapid Dispenser (Versions 1.5.1-1.5.2+)

(Duplicates some Stackable Items only) (patched)

This video will explain how to duplicate any item that can be crafted into a block using a dispenser and a redstone clock.

Bed Duplication (Patched)

Due to how beds are made out of 2 blocks, an explosion near the bed can make the bed drop 2 bed items, meaning you can spawn 2 beds (4 bed blocks) when you had 1 (2 bed blocks). You can repeat this and get infinite beds.

Ore Duplication (Patched)

Get an anvil and get either 9 iron ingot, 9 diamond, 9 coal, 9 gold ingot, 9 lapis lazuli, 9 redstone dust or 9 emerald. Rename 1 of the ores to something random, place it above the rest of the ores in your inventory and go to a crafting table. Craft a block of that ore and select 'craft all.' This will result in the player obtaining 1 block of (whatever ore you chose). The other 8 pieces will still be in your inventory.

Beacon + Pocket Edition (Patched)

This duplication is no longer possible on realms and only works with stackable items.

1. Get a beacon (It does not have to be activated).

2. Put items to duplicate in your Hotbar, the nine slots on your screen.

3. Open the beacon GUI.

4. Double-tap on the items you want to duplicate. You can't duplicate non-stackable items, and it only duplicates up to fill a full stack.

Note: This might only work if Settings > Video > UI Profile it is set to Pocket, not Classic.