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HitboxBackport

A small Mixin-type mod to backport sneaking through 1.5 block tall spaces from minecraft 1.13 and higher versions.
by Kwember
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1,337 downloads
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Updated Jul 6, 2026
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Addons Bug Fixes Server Utility Utility & QoL

Hitbox Backport

A small Mixin-type mod to backport sneaking through 1.5 block tall spaces from minecraft 1.13 and higher versions.

 

The Minecraft 1.13 update included a change to the players hitbox when sneaking, allowing players to sneak under top slabs into 1.5 block tall spaces, this change was part a larger movement change for swimming, crawling and sneaking. This mod uses mixins to vanilla Minecraft's code to backport this change to sneaking to 1.12.2. 

 

- REQUIRES A MIXIN LOADER (Like MixinBooter)

If you find any issues or bug in the mod, please report them on the GitHub issues page!

 

Authors note: While there are a few mods that backport 1.13 swimming, crawling and sneaking in its entirety, i noticed that there werent any mods that backported just the sneak mechanic. As such i made this mod for those who are just looking for this feature.
PlayerHitBoxBackport-1.0.3
MC Client, Forge, Server, 1.12.2
Release 2025-01-30 Get

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