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:To covert from a world with player saves files by name to player save files by their offline UUID:Code (Text):java -jar save-converter-1.0.jar worldTo convert from a world with player saves files by their online UUID to player save files by their name:Code (Text):java -jar save-converter-1.0.jar -o worldTo convert from a world with player save files by their offline UUID to player save files by their name:Code (Text):java -jar save-converter-1.0.jar -r worldAdditionally passing -n will cause it to change no files, only print out what it would have changed.Code (Text):java -jar save-converter-1.0.jar -r -o world
Source: https://github.com/cybertiger/save-converter
Builds: http://cyberiantiger.org/jenkins/job/save-converter/
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UUID/playername save file converter. 1.1
Easily convert player save files between formats in both offline and online mode.