BossBarScale
by Escyth
BossBarScale lets a Fabric player change the size of boss bars shown on screen, through a slider in its own settings screen.
What it does
Boss bars such as the Ender Dragon or Wither health bars are drawn at a fixed size by default. BossBarScale changes that size on the client, so each player can make them larger or smaller without any server change. The scale is set with a slider in the mod's config screen, and the change takes effect after Save Changes is pressed.
The config screen opens from Mod Menu when that mod is installed. Mod Menu is optional, so without it the settings are still reachable through the mod's own entry point. YetAnotherConfigLib (YACL) is required and must be installed next to BossBarScale, with Fabric API also present on Fabric. The default scale is x0.75.
Files are published for Fabric only, with a single game version, 1.21.8. The latest file is 0.3, dated 2025-09-27. The mod is released under the MIT License and is not open source. Because only the client needs it, players join servers without installing it.
Key features
Boss bar slider
A slider in the settings screen sets the scale of boss bars in small steps around the default value.
Config screen via Mod Menu
Mod Menu opens the settings screen for the mod when it is installed, placing the controls in the usual list.
Apply on save
Changes are kept in a pending state until Save Changes is pressed, after which the new size applies to boss bars.
Default scale of x0.75
Boss bars start at a scale of x0.75, and the slider can return them to that value at any time.
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
Optional 1
Use cases
Who it’s for: Players on Fabric 1.21.8 who want boss bars at a size other than the default. Only the client needs the mod, so it suits both single-player worlds and multiplayer clients.
How it compares
Bossbar Config is a Fabric mod for 1.21.10 – 1.21.11, released under the MIT License and not open source; it is client-side only. Smaller Crystals is a Fabric mod for 1.21 – 1.21.5, client-side only, under All rights reserved and not open source; it resizes end crystals rather than boss bars. SubtitleScale is client-side only and open source under the MIT License, covering 1.21.9 – 1.21.11, so it fits players on those versions who want subtitles resized instead.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BossBarScale | Fabric | 1.21.8 | Client-side only | 2025-09-27 |
| Bossbar Config | Fabric | 1.21.10 – 1.21.11 | Client-side only | 2026-03-25 |
| Smaller Crystals | Fabric | 1.21 – 1.21.5 | Client-side only | 2025-12-31 |
| SubtitleScale | Fabric | 1.21.9 – 1.21.11 | Client-side only | 2026-03-13 |
Questions
Does BossBarScale need Fabric API?
Must the server have BossBarScale installed?
Is Mod Menu required to change the scale?
Which game versions does BossBarScale support?
In the catalog
BossBarScale is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 17,695 mods support Minecraft 1.21.8.
Similar mods
What the author says
If you encounter any issues, message me on Discord @escyth.
Official listing
- Modrinth page
- modrinth.com/mod/bossbarscale
- Owner
- Escyth
- Published
- 2025-08-18
- Updated on Modrinth
- 2025-09-27
- Facts verified
- 2026-10-15