Tool
Which version made this world?
Every Minecraft save carries a DataVersion in its level.dat, and it is the only thing in there that names the version that wrote it. Paste the number and get the version, plus what you are still allowed to open the world with.
DataVersion for recent releases
The reverse lookup, in case you know the version and want the number.
- Minecraft 26.24903Java 25
- Minecraft 26.1.24790Java 25
- Minecraft 26.1.14788Java 25
- Minecraft 26.14786Java 25
- Minecraft 1.21.114671Java 21
- Minecraft 1.21.104556Java 21
- Minecraft 1.21.94554Java 21
- Minecraft 1.21.84440Java 21
- Minecraft 1.21.74438Java 21
- Minecraft 1.21.64435Java 21
- Minecraft 1.21.54325Java 21
- Minecraft 1.21.44189Java 21
- Minecraft 1.21.34082Java 21
- Minecraft 1.21.24080Java 21
Frequently asked
Where do I find the DataVersion?
It is in level.dat, at the root of your world folder. Open it with an NBT editor and read the DataVersion field, or run a command line NBT tool. Nothing is uploaded here: you paste the number, not the file.
Why does this matter?
Minecraft upgrades a world silently when you open it in something newer, and it refuses to open a world saved by a newer version at all. So the number decides whether an old backup can still be opened, whether a server can be rolled back, and which jar you need to download.
My number is not in the list
The sequence has gaps, because Mojang increments it on builds that were never published. When there is no exact match we name the versions either side of it, which brackets the answer to a few days of development.
Can I open the world in an older version?
No. Minecraft only ever moves a world forward. Opening a save in an older version fails, and forcing it is how worlds get corrupted. If you need an older version, restore a backup from before the upgrade instead.
Two versions share my number
Five numbers in the whole set are shared, always by an April Fools build and the snapshot next to it. 24w14potato and 24w12a both report 3824. Both are listed rather than us picking one, because the save cannot tell them apart either.
Is this information wrong or missing something? .