What Protobuf Decoder does
Decode a protobuf payload from base64 or hex without its .proto, showing every field number, wire type, and plausible reading.
Also searched as protobuf, proto, protocol buffers, decode protobuf, wire format, grpc, binary decoder, pb.
Read tags, wire types, and varints
Recurse into length-delimited fields that parse as messages
Keep every defensible reading of each field
The wire format omits the type
A varint is equally an int64, a sint64, or a bool, and a length-delimited field is equally a string, bytes, or a nested message. The decoder shows its best reading and keeps the alternatives beside it rather than guessing silently.
Protobuf Decoder FAQ
Does jsontools.me upload my JSON?
No. The document is parsed and processed by json-buf inside a dedicated WebAssembly worker on your device.
Does it work offline?
Yes. After the application shell and engine have loaded once, the installable PWA keeps the tools available without a network connection.