SimpleHitbox
by DoomzDay
SimpleHitbox is a Fabric client mod that replaces the default entity outlines with customizable hitboxes, letting players set colors, transparency, line thickness and animation per entity.
What it does
Vanilla hitboxes are plain outlines with a fixed look. SimpleHitbox redraws them with settings for color, transparency and line thickness, so a hitbox can be made subtle or strongly visible. Each entity type or player can be configured on its own, which gives precise control over how different mobs and players are displayed.
Animation styles include pulsing, flickering, glowing and smooth rainbow transitions, and all settings sit in an in-game interface opened with a single key. Changes apply immediately without editing config files. The mod is client-side only, so a server does not need it and players can join unmodified servers. It requires Fabric API and is for 1.21.10.
The mod is useful when hitboxes need to be easier to read, for example while testing mob behavior, recording footage or playing in busy areas. It is published under All rights reserved, so the code is not open source.
Key features
Custom hitbox colors
Each hitbox can use its own color and transparency, replacing the default outline appearance.
Adjustable line thickness
Outline thickness is a setting, so hitboxes can be made thin and unobtrusive or thick and clearly visible.
Animation styles
Pulsing, flickering, glowing and smooth rainbow transitions animate the hitbox outlines.
Per-entity settings
Mobs and players can each be configured separately, so different entities keep distinct appearances.
In-game settings screen
A single key opens the settings, and changes take effect without touching configuration files.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Players who want to see entity hitboxes more clearly, content creators who record gameplay, and anyone who prefers a different hitbox style from the vanilla outline.
How it compares
Fluxly Hitboxes is a Fabric client-side mod for 1.21 – 1.21.10, licensed under Creative Commons Attribution 4.0 and not open source. Pretty Hitboxes Updated is also client-side and open source under the MIT License, but it targets only 1.21.11. RedRange is client-side only for 1.20 – 1.21.4 under the MIT License, with no open-source code listed as such.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SimpleHitbox | Fabric | 1.21.10 | Client-side only | 2026-04-05 |
| Fluxly Hitboxes | Fabric | 1.21 – 1.21.10 | Client-side only | 2025-11-28 |
| Pretty Hitboxes Updated | Fabric | 1.21.11 | Client-side only | 2026-07-07 |
| RedRange | Fabric | 1.20 – 1.21.4 | Client-side only | 2026-06-29 |
Questions
Does SimpleHitbox need Fabric API?
Does a server need SimpleHitbox?
Which game version does SimpleHitbox support?
Can the hitbox settings be changed while playing?
In the catalog
SimpleHitbox is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 15,569 mods support Minecraft 1.21.10.
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What the author says
SimpleHitbox is a client-side Fabric mod that reimagines how hitboxes look and behave in Minecraft, giving you full control over their appearance in a clean and intuitive way. Instead of the default vanilla outlines, SimpleHitbox allows you to fully customize hitboxes with your own colors, transparency, and line…
Official listing
- Modrinth page
- modrinth.com/mod/simplehitbox
- Owner
- DoomzDay
- Published
- 2026-04-05
- Updated on Modrinth
- 2026-04-05
- Facts verified
- 2026-10-15