MCB is a compiled, schema typed binary re-encoding of the definition files that
Bedrock used to ship as plain JSON: cameras, particles, villager trades, voxel
shapes, and more. Each MCB blob lives as a single entry inside a .brarchive
container, and an archive can freely mix MCB entries with ordinary text JSON
entries. You can tell them apart by the first four bytes: an entry is MCB when
it starts with 7F 4D 43 42, which is \x7F followed by MCB, in the same
spirit as the \x7FELF magic.
theaddonn
/ mcb-format.md
Last active
August 19, 2026 12:47
The MCB binary format: Minecraft Bedrock's compiled JSON (cameras, particles, trades, voxel shapes) stored inside .brarchive containers