SneakFix
With SneakFix installed, a quick tap of the crouch key no longer leaves the player's crouch state out of step with the server.
What it does
The mod targets a desync in the crouch animation. The server sends back packets that confirm each crouch and uncrouch, and when a player taps the key quickly, the client can start and stop the animation before those confirmations arrive. SneakFix makes the client ignore those visual acknowledgment packets, so the crouch state stays consistent on the client end. Players who notice an extra crouch animation after tapping the key repeatedly are describing this bug, which has existed since the crouching animation was added.
SneakFix changes only how crouching behaves on the client. It is a client-side only mod, so the server does not need it, and a player can join a server running any version of the game with it installed. It is published for Fabric alone, with builds for 1.20.2 – 1.21.4 and 1.21.4 as the latest file, dated 2024-12-17. The code is released under the Apache License 2.0, but the project is not open source as a whole.
The mod is intentionally small. The author notes that it borrows code from another sneak-tweaking mod, and that it was made to fix only this bug, without the dependencies a larger mod would bring. Anyone who wants more control over how crouching works will need a different mod.
Key features
Ignores acknowledgment packets
Visual acknowledgment packets from the server are ignored, so the client does not replay crouch state that is already out of date.
Fixes rapid crouch spam
Tapping the crouch key quickly no longer produces the extra animation or the visual desync that follows it.
No dependencies
The fix works without other mods, so it adds no extra libraries to the game.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Quick crouch on servers
A player on a server who taps the crouch key in quick succession sees a steady animation instead of a repeated one.
Who it’s for: Players who hit the visual crouch desync on multiplayer servers, and who want a small fix that leaves other crouch behavior unchanged.
How it compares
Fix Shift Twice is a Fabric mod for 1.21.11 – 26.1.2 with a client and server environment and a Creative Commons Attribution 4.0 license, so it must also run on the server. Don't Stop Crouching is a client-side only Fabric mod for 1.21.8 – 1.21.11 under All rights reserved. InventoryCrouch is a client-side only Fabric mod for 1.21 – 1.21.11, also under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| SneakFix | Fabric | 1.20.2 – 1.21.4 | Client-side only | 2024-12-17 |
| Fix Shift Twice | Fabric | 1.21.11 – 26.1.2 | Client and server | 2026-09-26 |
| Don't Stop Crouching | Fabric | 1.21.8 – 1.21.11 | Client-side only | 2026-03-06 |
| InventoryCrouch | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-01-29 |
Questions
Does SneakFix need Fabric API or other mods?
Does the server need SneakFix installed?
Which game versions does SneakFix cover?
In the catalog
SneakFix is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 17,979 mods support Minecraft 1.21.4.
More from Lightningbulb
Similar mods
What the author says
It's because the server sends back the visual starting and stopping crouching animations when the player crouches, but information takes time to travel and it is trivial to crouch and uncrouch before the server sends those packets back. This causes a visual desync on the client end. Load up a world or join a server…
Official listing
- Modrinth page
- modrinth.com/mod/sneakfix
- Owner
- Lightningbulb
- Published
- 2023-11-21
- Updated on Modrinth
- 2024-12-17
- Facts verified
- 2026-10-15