F3Up
by infikot
F3Up rebuilds the F3 debug screen from an external JSON file, so players choose which lines appear, in what order and how they are formatted.
What it does
The whole F3 layout is defined in a configuration file named f3up.json: module definitions, their priority order and grouping. Custom modules can be placeholders with formatting, and their visibility is switched from the F3+F6 Debug Options menu. Built for the Debug Options structure introduced in Minecraft 1.21.9, the mod swaps out the vanilla Debug HUD and Debug Options features instead of running alongside them.
F3Up is a client-side mod for Fabric. Only the player needs it, and servers run without it. Files are published for 1.21.9, 1.21.10 and 1.21.11, with 1.1.1 for 1.21.11 as the latest build, and the code is released under All rights reserved, so it is not open source. Configuration can be managed with client-side commands.
Key features
Configuration-first layout
Module definitions, priority order and grouping are set in f3up.json instead of fixed in code.
Custom module categories
Players define their own data modules and group them into categories, shown both on the screen and in the F3+F6 menu.
Nearby entity counts
A module can count mobs or items within a chosen radius, for example mobs within 16 blocks.
Inventory item counts
A module can track how many of a specific item the player carries, such as diamonds.
Targeted entity info
A module can display the name and ID of the nearest entity.
Minecraft formatting codes
Built-in color codes and styles like bold and italic apply directly to configuration lines for readability.
Update frequency control
The update rate is set globally in milliseconds, so metrics refresh without heavy overhead.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Tailored diagnostics
A player who tests redstone or mob farms can show only the counters needed for that build.
Shared debug layouts
Players can copy one f3up.json file to another setup to reproduce the same screen.
Who it’s for: Players who use the F3 screen regularly and want a layout of their own, and modpack or server builders who prefer a consistent debug view.
How it compares
HudBro is a client-side mod for Fabric with files for 1.21.1 – 1.21.11, released under CC0 1.0 Universal and open source. Old Debug Screen is also client-side, for Fabric with files for 1.21.9 – 26.3, under the MIT License and open source. F3Up is limited to 1.21.9 and newer and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| F3Up | Fabric | 1.21.9 – 1.21.11 | Client-side only | 2026-01-16 |
| HudBro | Fabric | 1.21.1 – 1.21.11 | Client-side only | 2026-08-15 |
| Old Debug Screen | Fabric | 1.21.9 – 26.3 | Client-side only | 2026-09-20 |
Questions
Does F3Up need to be installed on the server?
Which Minecraft versions does F3Up support?
Where is the layout configured?
In the catalog
F3Up is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
&cacheSeconds=600&link=https%3A%2F%2Fmodrinth.com%2Fmod%2Ff3up) - follow pls:^ Are you tired of the fixed, chaotic layout of Minecraft's F3 Debug Screen? F3Up transforms the standard F3 overlay into a fully personalized diagnostic suite, giving you complete modular control over what, where, and how data is displayed.
Official listing
- Modrinth page
- modrinth.com/mod/f3up
- Owner
- infikot
- Published
- 2025-10-06
- Updated on Modrinth
- 2026-01-16
- Facts verified
- 2026-10-15