Put in your seed and edition and you get your actual overworld: biomes in their in-game colors, hills shaded by height, and every structure where the game puts it.
Click an icon for its coordinates, or click anywhere on the map to see the biome and height there. Pick what shows up in the Layers panel. The Dimension toggle jumps to the Nether or the End and keeps your seed.
Since 1.18, Java and Bedrock build the same terrain and biomes from the same seed, so the map itself works for both.
Structures are a different story: Bedrock places them its own way. I dug the Bedrock rules out of the game itself (same process as the Netherite Finder), so every structure type shows on both editions. One known gap: Bedrock skips a temple if its chunk dips below sea level, and the map can't see that yet, so once in a while a Bedrock temple shows up that isn't really there.
Terrain, biomes and Java structures are built on cubiomes, a re-implementation of Minecraft's world generator. I checked the results against worlds generated by real Java and Bedrock servers.
Pyramids, jungle temples and mansions also need flat enough ground, which is estimated, so very rarely one shows up that the game skipped. Heights on the map are close but not perfect, so treat a river break or a shoreline as a strong hint, not a promise.
Reference: Reading a Minecraft Seed Map
A Minecraft world is fully determined by its seed: the same seed always gives the same terrain, biomes and structures (per edition and version). That is what makes a seed map possible. Enter the seed from your world and this map shows you what is out there before you set off.
How do I find my seed?
Type /seed in chat. On Java it works in any singleplayer world; on Bedrock it needs cheats on, or you can read it in the world's settings under Game. On a server, the owner can run it from the console.
The structures on the map
- Villages: five types by biome (plains, desert, savanna, taiga, snowy). About 2% are abandoned zombie villages; the map labels those.
- Igloos: about half have a hidden basement (a ladder under the carpet leads to a brewing room with a zombie villager). Those get their own icon, with the ladder and room drawn under the dome.
- Strongholds: 128 per world in rings around the origin. The first ring's three sit roughly 1,280 to 2,816 blocks out. The end portal is inside.
- Trial chambers: underground copper-and-tuff complexes with trial spawners, vaults and the mace's heavy core, usually between Y=-40 and Y=-20.
- Ancient cities: deep dark cities at around Y=-51, with the best loot in the overworld and the warden.
- Woodland mansions: rare, in dark forests, often thousands of blocks from spawn.
- Ocean monuments, pillager outposts, desert pyramids, jungle temples, swamp huts, igloos and trail ruins each have their own icon.
- Ruined portals, shipwrecks, ocean ruins and buried treasure are common and small, so they start hidden; turn them on under "Common, small".
Java vs Bedrock on a seed map
Since 1.18 (Caves & Cliffs), Java and Bedrock generate the same overworld terrain and biomes from the same seed, so that part of the map is the same on both. Structures are still placed differently per edition: a village on Java is not in the same spot on Bedrock. Pick your edition and the map shows the right ones. Every structure type is covered on both.
Switching to the Nether
The Dimension toggle opens the Nether Seed Map with your seed and edition carried over, centered on the Nether position that matches where you are (Overworld coordinates divided by 8). Fortresses, bastions and ruined portals are shown there for both editions.