ModsJava
CheckHacks
Detect client-side mods and hack clients on your server using the Sign Translation Vulnerability. Free Minecraft Java mod for 1.21, 1.21.1, 1.21.2.
⬇ Download on Modrinth
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 1.21.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as CheckHacks-1.3.1.jar — drop this file into the mods folder
- Download size: 13.4 MB
- Download link checked 29 Aug 2026 — working
These come from our own check of the pack file, not from the source page.