Seed Map
Slime chunks & seed tools · Java and Bedrock
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Slime chunks & seed tools · Java and Bedrock
Leave it blank for seed 0, or roll a random one.
On Java Edition, type /seed in chat (it needs cheats on, or operator rights on a server). On Bedrock, open the world's settings: the seed is listed under Game.
Yes. Pick Bedrock and the map places structures and slime chunks the way Bedrock does, which differs from Java even for the same seed.
About one chunk in ten is a slime chunk, where slimes can spawn deep underground at any light level — the place to build a slime farm. Which chunks they are depends only on the seed, so the map can show them.
No. The map computes the world from the seed in your browser; nothing is installed and your seed is not sent anywhere.