Slime chunk finder

All the slime chunks of your world, Java or Bedrock, on a grid, with the best spots to AFK at to activate as many slime chunks as possible.

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Slimes can spawn in swamps at night, or in slime chunks below Y 40, where they spawn at any light level. About 1 chunk in 10 is a slime chunk. Type your seed and coords and look for the best spot for your farm. Usually, a one-chunk farm is more than enough.

On Bedrock you don't even need your seed: slime chunks are the same in every world, just pick Bedrock on the switch.

How to use it

Pick Java or Bedrock. On Java, type /seed in the chat to find your seed and put it in (on a server, ask your server admin to do it). On Bedrock there's nothing to type.
Type your coords in X and Z (or leave them empty) and press "Find slime chunks".
Look around (drag the grid) and click a chunk to get its coordinates.

Where slimes spawn

A grid of chunks with some green slime chunks, a player standing in the middle, a small circle of 24 blocks around the player and a big one of 128 blocks — Nothing spawns within 24 blocks of you, and a slime more than 128 blocks away despawns immediately. The active slime chunks are therefore the ones between the two circles (always below Y 40).

Questions

Are slime chunks the same in every version?

In Java Edition they depend only on the seed. Only the height changed: since Beta 1.9 slimes spawn below Y 40, while before they spawned only up to Y 16. In Bedrock, slime chunks are the same in every world, and this tool shows them too: pick Bedrock on the switch.

Do slimes spawn in swamps too?

In swamps they spawn between Y 51 and Y 69, at a light level of 7 or less, more often on a full moon and never on a new moon. This tool only shows slime chunks.

How high should I AFK?

Below Y 40, at the level of your farm.