Protobuf inspector

Upload a Protobuf binary message to inspect wire numbers, raw values and UTF-8 candidates.

Workspace

Runs locally in your browser. No file upload.

Private, on-device processing

↑Drop a file here or choose oneRead locally · No upload · Size limits vary by tool

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Output and diagnostics appear below after processing.

How it works

Decodes protobuf wire tags, varints, 32-bit and 64-bit fields, and length-delimited bytes. Results are JSON inspection records.

Important limitations

This is not a typed conversion without a .proto schema or descriptor; binary floats, repeated fields and embedded messages cannot be inferred reliably.

Frequently asked questions

Are my files uploaded?

No. The file is processed in your browser. This version does not transmit user file content to any server.

Is protobuf binary inspector free?

Yes. The browser processing tools are free and do not require an account or API key.