Tools Hub - Free Browser-Based Tools

Schema (Optional)

📄Drop .proto file here or click to uploadOptional: Upload a .proto schema to decode binary data

Input Data

About Protobuf Visualization

Why Developers Need a Protobuf Visualizer

Protocol Buffers (Protobuf) are Google language-neutral, platform-neutral, extensible mechanism for serializing structured data. While incredibly efficient for production use, Protobuf binary format is essentially unreadable to humans. When debugging or inspecting data, developers traditionally had to write custom parsing code or use command-line tools that lack visual clarity.

Our browser-based Protobuf visualizer solves this problem by instantly converting Base64 or Hex encoded Protobuf data into a clean, hierarchical tree structure. No installation, no configuration, no command-line gymnastics—just paste and explore.

Understanding Protobuf Encoding

Protobuf uses a binary format that is far more compact than JSON or XML, but correspondingly less human-readable. Each field consists of a tag (containing field number and wire type) followed by the value. The tag encoding uses base-128 varints, which means you cannot simply split binary data at fixed offsets.

Example Protobuf Binary (Hex)

08 96 01 12 0B 48 65 6C 6C 6F 20 57 6F 72 6C 64 1A 05 77 6F 72 6C 64

This hex string represents a message with three fields:

08 96 01 — Field 1 (integer, varint): value 150
12 0B "Hello World"— Field 2 (length-delimited): string "Hello World"
1A 05 "world"— Field 3 (length-delimited): string "world"

JWT Decoding Made Simple

JSON Web Tokens (JWT) are widely used for authentication and authorization, but the payload is Base64 encoded—not encrypted. You cannot inspect a JWT's contents without decoding it. Our tool extracts and displays the JWT payload in a readable format, making it invaluable for debugging auth issues or auditing token contents.

JWT Structure

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

The token consists of three parts separated by dots:Header (Base64), Payload (Base64), andSignature (Base64). Our visualizer decodes the payload and presents it as a structured tree.

Key Features of Our Visualizer

Multi-format support — Decode Base64, Hex, or JWT tokens from a single interface
Real-time parsing — Results update as you type, with minimal latency
Hierarchical tree view — Nested structures are displayed as expandable trees
Copy-friendly output — One-click copy of decoded JSON for use in other tools
100% client-side — No data leaves your browser; your tokens and payloads are never transmitted
No .proto file required — Decode raw binary without schema definitions for simple inspection

Security Note

Never paste production JWTs with real secrets into online tools. While our tool processes everything locally, always exercise caution with sensitive credentials. For production debugging, consider using local tools like jwt.io or writing custom parsers in a trusted environment.

When to Use a Protobuf Visualizer

Common use cases for our tool include:

API debugging — Inspect binary responses from gRPC services
Auth troubleshooting — Decode and verify JWT payloads during development
Data inspection — Examine Protobuf messages from Kafka, RabbitMQ, or other message queues
Schema exploration — Understand structure of unknown Protobuf payloads
Learning Protobuf — Visualize how binary encoding represents structured data

Frequently Asked Questions

Can I decode Protobuf without a .proto schema file?

Yes, for simple inspection you can decode raw Protobuf binary without the schema. The tool will display field numbers and wire types. However, without a .proto file, you will not know the semantic meaning of each field—only their structural position and data type.

Why does my JWT decode to garbled text?

This typically happens when the JWT payload is not valid UTF-8 encoded JSON. The JWT standard requires Base64url encoding of UTF-8 JSON, but some implementations incorrectly encode data. If you see garbled output, verify that the token was generated correctly.

Is my data sent to your servers?

No. All processing happens in your browser using JavaScript. Your Protobuf data, JWT tokens, and any other input never leave your device. You can verify this by disconnecting from the internet and trying the tool—it will still work.

What is the maximum input size?

The tool handles inputs up to 5MB. For larger data, consider breaking it into smaller chunks or using a dedicated desktop tool with more resources.