Height Lock
by MPDev
Height Lock is a client-side Fabric utility that holds block placement to a chosen Y-level, so players stop misplacing blocks off their build plane.
What it does
The mod targets accidental misclicks while building on a platform. Once a Y-level is locked, the final placement position is fixed to that height, and a player can only build on the chosen plane. A grid mark shows the locked level so the target stays visible while building.
Target height is adjusted with keys and a HUD overlay: the target can be raised or lowered one block at a time, or set to the Y-level of the block under the crosshair. The default toggle key is H. The rule is intentionally simple and works without any setup once the mod is enabled.
The mod is a client-side lightweight utility that cannot enforce anything on a server. It needs only Fabric API. Mod Menu and Cloth Config API are optional and open the customization screen. Files are published for Fabric across 16 release versions, 1.21 – 26.2, and the mod is not open source; it is released under All rights reserved.
Key features
Locked placement height
Block placement is confined to one exact Y-level, which keeps a build on a single plane.
Adjustable target
The target Y can be raised or lowered step by step, or set to the level of the block under the crosshair.
Toggle and grid marks
The lock is switched on and off with a key, and grid marks show the locked level while it is active.
Optional customization
Installing Mod Menu and Cloth Config API opens a settings screen for changing the lock options.
Gallery
Compatibility
Latest build for each game version and loader.
26.x4 of 4 versions with builds
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Flat builds
Players constructing a floor, wall or platform keep every placed block on one layer.
Terraforming
Building a level surface across uneven ground stays on a fixed height throughout the work.
Who it’s for: Players building on flat planes in survival or creative worlds who want fewer accidental placements at the wrong height. Server owners should note the mod does not run on servers.
How it compares
Lock On is a Fabric client mod for 1.20 – 1.20.4, with the same client-side environment and open source under the MIT License, so it targets a different version range. Camera Lock is also client-side and open source under the MIT License, published for 26.1 – 26.1.2, and locks the camera rather than block placement. LockMap runs server-side only, is published for 1.21.10 and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Height Lock | Fabric | 1.21 – 26.2 | Client-side only | 2026-07-24 |
| Lock On | Fabric | 1.20 – 1.20.4 | Client-side only | 2023-10-23 |
| Camera Lock | Fabric | 26.1 – 26.1.2 | Client-side only | 2026-06-15 |
| LockMap | Fabric | 1.21.10 | Server-side only | 2026-05-02 |
Questions
Does Height Lock need Fabric API?
Does Height Lock have to be installed on the server?
Which game versions does Height Lock support?
In the catalog
Height Lock is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 13,894 mods support Minecraft 26.2.
Similar mods
What the author says
Height Lock is a client-side lightweight Fabric utility mod that lets you lock block placement to one exact Y-level. It does not enforce anything server-side, add a HUD overlay, or try to special-case different block types. The rule is intentionally simple: if the final placement position is not on the chosen…
Official listing
- Modrinth page
- modrinth.com/mod/height-lock
- Owner
- MPDev
- Published
- 2026-05-02
- Updated on Modrinth
- 2026-07-24
- Facts verified
- 2026-10-15