RatScanner.org for WindowsChecks every new mod the moment it lands in your mods folder, before your game can load it. Free.Windows 10 and 11

Know what a mod does before you run it.

Drop in a Minecraft mod or client and get a report on what its code is actually able to do — stealers, loaders, miners, tampered dependencies — with a decompiler to read every line it flags.

Drop a .jar here

or click to choose a file

Scan by URL

Fetched server-side. Private, loopback and cloud-metadata addresses are refused, so this cannot be pointed at anything on our own network.

Check a hash

Answers without the file: whether it has been scanned here, what the verdict was, and when it was decided.