PlugCheck is a free web tool that tells you whether your plugins are compatible with a target Minecraft version before you commit to the update.

No server downtime. No trial-and-error. No account required.

How it works:
1. Drop your .jar files onto the page (or type the plugin name)
2. Select your target MC version and platform (Paper, Spigot, Fabric, Forge)
3. Hit Check — results appear in seconds

PlugCheck queries Hangar and Spiget in parallel to get real compatibility data, then runs a conflict detector against known plugin pairs that break together.

Your .jar files are parsed locally in the browser — they never leave your machine.

Results are cached for 6 hours so repeat checks are instant.

Supports: Paper, Spigot, Fabric, Forge
Source: Hangar + Spiget APIs
Built for server admins who update carefully.