MessagePack Converter - Free Online Tool | PivaBox

Convert between JSON and MessagePack — a compact binary serialization format

How to Use MessagePack Converter

  1. Enter or paste your JSON data in the input textarea
  2. Select the conversion mode — JSON to MessagePack to encode, or MessagePack to JSON to decode hex bytes back to JSON
  3. Click Convert to perform the conversion. Compare the sizes to see how much MessagePack saves

Frequently Asked Questions

What is MessagePack?

MessagePack is an efficient binary serialization format that lets you exchange data among multiple languages like JSON — but it is faster and smaller. It encodes data into compact binary form, typically 30-50% smaller than equivalent JSON, making it ideal for network transmission, caching, and storage.

Is MessagePack Converter free?

Yes, PivaBox MessagePack Converter is completely free to use. No charges, subscriptions, or hidden fees.

Does my data leave my device?

No. All conversion happens entirely in your browser using the <code>msgpack/msgpack</code> library running locally. Your data never leaves your device.