Paste a list of usernames, resolve UUIDs, and download a ready-to-use whitelist.json for your Java server.
Up to 50 names per lookup. Online mode queries Mojang’s profile API; offline mode generates Java OfflinePlayer UUIDs locally.
whitelist.json.server.properties.white-list=true (and use matching online-mode)./whitelist reload.Use Online mode when online-mode=true — UUIDs come from Mojang/Microsoft accounts and stay the same if a player renames.
Use Offline mode when online-mode=false — UUIDs are derived from OfflinePlayer:<name>. A rename creates a completely different UUID.
The JSON matches vanilla Java Edition:
[
{
"uuid": "069a79f4-44e9-4726-a5be-fca90e38aaf5",
"name": "Notch"
}
]You can also copy /whitelist add console commands for live servers.