Dupe Key
With Dupe Key, a player holding an item in the main hand can press K to open a small menu and duplicate that item.
What it does
The mod is a Fabric client mod that lets a player duplicate the item held in the main hand. Holding the item, pressing K opens a configurable menu, and clicking Dupe Item adds an identical copy to the inventory at once, with no commands needed. Dupe Key is built on Fabric Loader 0.15.0 and requires Fabric API.
According to the author, creative mode copies carry full data, including enchantments, NBT and the contents of shulker boxes. In survival or adventure, the item data is only transferred when the server has cheats enabled and an operator uses the mod in version 2.0.0. The client-side environment means the server does not need the mod installed for the menu itself to work.
Key features
Hold and duplicate
Hold an item in the main hand, then open the menu and click Dupe Item to add a copy to the inventory.
Configurable menu key
The key that opens the Item Duper menu can be changed in the controls settings.
Full item data
In creative mode, copies keep enchantments, NBT data and shulker box contents.
Builds for 1.21.11 and 26.1
Files are published for each game version listed, with 2.0.0 as the latest build for 26.1.
Gallery
Compatibility
Latest build for each game version and loader.
26.x1 of 1 version with builds
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Creative building
Players in creative mode can copy a stack of tools, enchanted gear or filled shulker boxes without collecting them again.
Testing item data
A player checking how enchantments or stored contents behave can make a matching copy from the held item.
Who it’s for: Players on single-player or multiplayer clients who want quick copies of held items in creative mode, and server operators who need to know how survival duplication depends on cheats being enabled.
How it compares
AntiShulkerDupe is a Fabric server mod for 1.17 – 1.19.2, released under the MIT License and open source. It runs on the server alone, so players join without installing it. Command Binds is a Fabric client mod for 1.21 – 26.1.2 under the MIT License and open source, and it binds commands to keys rather than duplicating items.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Dupe Key | Fabric | 1.21 – 26.1 | Client-side only | 2026-03-27 |
| AntiShulkerDupe | Fabric | 1.17 – 1.19.2 | Server-side only | 2021-10-20 |
| Command Binds | Fabric | 1.21 – 26.1.2 | Client-side only | 2026-05-10 |
Questions
Does Dupe Key need Fabric API?
Does the server need Dupe Key installed?
Why does a survival copy need cheats enabled?
Is the Dupe Key source code public?
In the catalog
Dupe Key is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 11,959 mods support Minecraft 26.1.
More from heckerhecktdich
Similar mods
What the author says
Item Duper Dupe items directly from a simple GUI — no commands needed. Press K (configurable) to open the Item Duper menu. Hold any item in your main hand and click Dupe Item to instantly duplicate it into your inventory. Features Hold the item you want to duplicate in your main hand Press K to open the menu Click…
Official listing
- Modrinth page
- modrinth.com/mod/dupe-key
- Owner
- heckerhecktdich
- Published
- 2026-03-21
- Updated on Modrinth
- 2026-03-27
- Facts verified
- 2026-10-15