ModsJava
Duper
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
This mod was made together with ChatGPT, Copilot.
-Lightweight and simple - no commands needed.
-Press the "=" key (default, can be changed in Controls) to duplicate the item in your main hand.
-Works in both singleplayer and multiplayer servers (the server must also have the mod installed).
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.1, 1.20, 1.21.8
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as duper-forge-0.20.1.jar — drop this file into the mods folder
- Download size: 19 KB
- Download link checked 12 Sept 2026 — working
These come from our own check of the pack file, not from the source page.