Size Matters
by MrSnowman
Size Matters gives each player a permanent random height on first join, ranging from 70% to 130% of normal, on Fabric servers.
What it does
When a player joins a world for the first time, the mod checks whether that player already has saved data. If none exists, it draws a value between 0.7 and the upper bound, rounded to two decimal places, and stores it under a unique entry for that player. The stored value is then applied as the player's height and width, and the same value is reused on later joins, so each player keeps the same size.
Because the height depends on the player's UUID, a player returns with the same size every time. The mod is a roleplay-centric addition that gives each character a trait for the game. Size Matters is server-side only, so players join without installing it; only the server needs it, and it requires Fabric API and oωo (owo-lib). Versions before 1.21.x are not supported, and the card covers builds for 1.20.1 – 1.21.10.
Key features
Random first-join height
Each player receives a random size when entering the world for the first time, between 70% and 130% of normal height.
Permanent per-player size
The stored value is tied to the player's UUID, so the same height is applied on every later join.
Saved player data
The number is written to the player's unique user data, so it persists across sessions on the server.
Height and width scaling
The chosen value is applied to both the height and the width of the player model.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x9 of 9 versions with builds
1.20.x6 of 6 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Optional 1
Use cases
Roleplay servers
Server owners running roleplay communities can give each character a fixed physical trait without manual setup.
Adventure and social worlds
Players on shared servers see each other at different sizes, which changes how they move and interact in the world.
Who it’s for: Server owners and communities who want a permanent, randomized size trait for each player. Players join without installing the mod.
How it compares
Random Size is a Fabric, Forge, NeoForge and Quilt mod for 1.20.5 – 26.3, server required with the client optional, under the MIT License and not open source. RandomSize is open source under the MIT License, published for Fabric and NeoForge 1.21.11 – 26.2 with client and server required. Random Sizes targets Fabric only for 1.21.5 – 1.21.11 and needs both client and server, under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Size Matters | Fabric | 1.20.1 – 1.21.10 | Server-side only | 2025-12-01 |
| Random Size | Fabric, Forge, NeoForge and Quilt | 1.20.5 – 26.3 | Server required, client optional | 2025-09-26 |
| RandomSize | Fabric and NeoForge | 1.21.11 – 26.2 | Client and server | 2026-06-19 |
| Random Sizes | Fabric | 1.21.5 – 1.21.11 | Client and server | 2025-12-29 |
Questions
Does Size Matters need to be installed on the client?
Which dependencies does Size Matters require?
Which game versions does Size Matters support?
Does a player's height change between sessions?
In the catalog
Size Matters is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 15,569 mods support Minecraft 1.21.10.
Similar mods
What the author says
\ \ \ Size Matters is a roleplay-centric mod that adds the unique trait of height to the game. Upon joining a world for the first time, players will be assigned a random permanent height ranging from 70% to 130% of normal height.
Official listing
- Modrinth page
- modrinth.com/mod/sizematters
- Owner
- MrSnowman
- Published
- 2025-11-21
- Updated on Modrinth
- 2025-12-01
- Facts verified
- 2026-10-15