UUID/playername save file converter.

A tool to convert player saves between name and UUID.

Starting from Minecraft 1.7.6 and it's derivatives player save files are stored by player UUID instead of by player name. Since the UUIDs are different depending on if the server is in online and offline mode, this gives a total of 3 possible formats.

This tool will reversibly translate save files by player name to files by player UUID (either offline or online). If you wish to translate player save files from offline UUIDs to online UUIDs this can be achieved in two steps by translating to player save files by name first.

To convert from a world with player save files by name to player save files by their online UUID:

java -jar save-converter-1.0.jar world

To covert from a world with player saves files by name to player save files by their offline UUID:

java -jar save-converter-1.0.jar -o world

To convert from a world with player saves files by their online UUID to player save files by their name:

java -jar save-converter-1.0.jar -r world

To convert from a world with player save files by their offline UUID to player save files by their name:

java -jar save-converter-1.0.jar -r -o world

Additionally passing -n will cause it to change no files, only print out what it would have changed.

Source: https://github.com/cybertiger/save-converter
Builds: http://cyberiantiger.org/jenkins/job/save-converter/