Find the seed from a minecraft save based on the biome data.
Select a minecraft world save in zip file format.
This file will not be uploaded to any server, don't worry.
Select the minecraft version used to PLAY the world.
This is the version you select on the launcher, the version you
see on the F3 screen.
Starting from 1.15, the minecraft server sends the hash of
the world seed to the client. With this hash, the search
will be much faster. Enter it in decimal format, or leave
the field blank:
Select the minecraft version used to GENERATE the world.
This may be older than the version used to play it.
You can guess the version based on these features:
Boring oceans: 1.7 - 1.12
Fancy oceans: 1.13
New villages: 1.14
Bees: 1.15
Start the seed search.
This should take no more than 5 minutes.
If you don't see any progress after 1 minute, the program
probably crashed.
All the errors go to the developer console.