CommandF3

A lightweight mod adding a /f3 command to toggle the debug screen, show hitboxes, and reload chunks. Perfect for macOS users!.

94 Downloads

fabricgame-mechanicsoptimizationutility

Rent Server with this Mod

About this Mod

CommandF3

A simple client-side mod that adds an /f3 command to the game.

I made this because playing Minecraft on a Mac or a compact keyboard means streaching your finger a killometer just to check coordinates. And the keybinds like Fn + F3 + B are annoying, and some keyboards don't even have a function row. This mod fixes that by moving those keys into your chat.

What it does:

/f3 – Toggles the full debug menu overlay.
/f3 hitboxes – Shows or hides entity hitbox borders.
/f3 reload – Forces a clean reload of all visible world chunks.

Available Versions

CommandF3 1.1.0release

MC 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric

June 2, 2026

F3Command 1.0.0release

MC 1.21.11fabric

May 21, 2026

How to Install CommandF3 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 (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "CommandF3". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+8 more)

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

CommandF3 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 (1.21.11). You can switch loaders with one click in the panel.

Is CommandF3 compatible with fabric?

CommandF3 officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with CommandF3 – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if CommandF3 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.