Entity Desync Viewer

Render server-side hitboxes to see potential desync

10.3K Downloads

fabricutility

Rent Server with this Mod

Screenshots

About this Mod

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.

Available Versions

Entity Desync Viewer 1.0.3+1.21.5release

MC 1.21.5, 25w14craftmine, 1.21.6, 1.21.7, 1.21.8fabric

April 6, 2025

Entity Desync Viewer 1.0.2+1.21.2release

MC 1.21.2, 1.21.3, 1.21.4fabric

November 18, 2024

Entity Desync Viewer 1.0.2+1.21release

MC 1.21, 1.21.1fabric

November 18, 2024

Entity Desync Viewer 1.0.1release

MC 1.21.2, 1.21.3fabric

October 23, 2024

Entity Desync Viewer 1.0.0release

MC 1.21, 1.21.1-rc1, 1.21.1fabric

August 5, 2024

How to Install Entity Desync Viewer on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.8).

Install Mod

Open the mod browser in the dashboard and search for "Entity Desync Viewer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.8, 1.21.7, 1.21.6 (+8 more)

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Entity Desync Viewer server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.8). You can switch loaders with one click in the panel.

Is Entity Desync Viewer compatible with fabric?

Entity Desync Viewer officially supports fabric for Minecraft 1.21.8, 1.21.7, 1.21.6. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Entity Desync Viewer – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Entity Desync Viewer consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.