About & methodology

ChunkMaps is a free Minecraft seed map. Everything is computed in your browser — your seed is never uploaded, and there is no backend and no rate limit.

Engine

Worldgen is generated by cubiomes (MIT) compiled to WebAssembly. Biome areas, structure positions, strongholds, spawn and slime chunks all come from the same deterministic algorithms Minecraft uses.

Accuracy — what we do and don't know

• Biome layout and structure positions are deterministic for a given seed and version.
• Some structures have viability constraints (for example, temples need suitable terrain). Where a check can't be fully modelled, positions may over-report.
• Java edition worldgen is what we compute. Bedrock worldgen differs — treat Bedrock positions as approximate.
• We do not predict ores, trees or mob spawns from a seed map. Ores are a separate, terrain-dependent process.

Provenance

This is an independent, original implementation. It is not affiliated with Mojang, Microsoft, or any other seed-tool site. Third-party open-source libraries are used under their licences and credited in our NOTICE.

Privacy

Seeds and coordinates stay on your device. See our privacy page.