Protobuf Decoder

Protocol Buffers (Protobuf) is a high-performance binary serialization format developed by Google, widely used in gRPC communication and data storage. Normally, inspecting Protobuf data requires a .proto definition file, but this tool directly parses the wire format to read field structures and values without any schema.

It supports all four wire types: Varint (variable-length integers), 64-bit fixed, Length-delimited (strings, bytes, nested messages), and 32-bit fixed. For each field, it also shows possible data type interpretations.

This tool is useful for API debugging, gRPC traffic inspection, and legacy system data analysis — any scenario where you need to quickly inspect Protobuf binary content. It accepts both hexadecimal strings and Base64-encoded input, and all processing happens entirely in the browser, so your data is never sent to any external server.