ModsJava
Entity Desync Viewer
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 Fabric mod for Minecraft 1.21 enables the debug feature renderServerSideHitbox which is present as an unused function in the game's code. Enable hitboxes with F3+B and this mod will show the server-side hitboxes in green in addition to the normal client-side ones in white.
This only works for the integrated server in singleplayer mode.
Usage examples include observing desync after sprint-punching entities or standing on a client-side piston head.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.5, 25w14craftmine, 1.21.6
- 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 Modrinth — 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 entity-desync-viewer-1.0.3+1.21.5.jar — drop this file into the mods folder
- Download size: 42 KB
- Download link checked 20 Sept 2026 — working
These come from our own check of the pack file, not from the source page.