Inspect Protobuf Binary Data Instantly (No Schema Required)
Decode protobuf binary data (as hex or base64) to a human-readable field structure. Shows field numbers, wire types, and interpreted values without needing a .proto schema.
How to Use Protocol Buffer Inspector
How to Use the Protocol Buffer Inspector
Step 1: Get Your Binary Data
Obtain the raw protobuf bytes from:
- A network request payload (copy as hex from DevTools)
- A gRPC message body
- A file or database field storing serialized proto
- A debugging log that outputs hex or base64
Step 2: Choose Input Format
- Auto — detects hex vs base64 automatically (default)
- Hex — for space-separated or continuous hex strings (e.g.
0a 05 48 65 6c 6c 6f) - Base64 — for standard or URL-safe base64 strings
Step 3: Inspect the Field Structure
The output shows each field as decoded from the wire format:
| Wire Type | Label | Decoded As |
|---|---|---|
varint | field type 0 | uint64, int64, sint64, bool |
len | field type 2 | string, embedded message, or raw bytes |
64-bit | field type 1 | int64 and double |
32-bit | field type 5 | int32 and float |
Nested (embedded) messages are automatically detected and shown as an indented subtree.
Limitations
This is a schemaless decoder that operates on the wire format only. Without a .proto schema:
- Field names are not known (only numbers)
- Varint fields show multiple interpretations (uint/int/sint/bool)
- The actual proto type (int32 vs enum vs bool) cannot be determined
- Packed repeated fields may appear as raw bytes
Use Cases
- Inspect gRPC request/response payloads during debugging
- Verify serialization output from proto libraries
- Reverse-engineer proto message structure
- Debug binary data stored in databases or caches
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