JSON to MessagePack Converter
Convert JSON to MessagePack binary format. See hex dump, Base64 encoding, and size savings compared to JSON. MessagePack is a fast, compact binary serialization format used in Redis, gRPC, and real-time APIs.
Features
📦 Pure MessagePack v2.0
- Full MessagePack specification v2.0
- Handles all JSON types: null, bool, int, float, string, array, object
- Compact fixint, fixstr, fixmap, fixarray types
- Hex dump with 16-byte rows
📊 Size Analytics
- Compare JSON bytes vs MessagePack bytes
- Percentage size reduction shown
- Base64 encoding of the binary output
- Download as raw .msgpack binary
🔒 Privacy-First
- All encoding happens in your browser
- No data sent to servers
- Works offline after first load
- Suitable for sensitive data
About MessagePack
MessagePack is a binary serialization format designed to be faster and more compact than JSON. It is used in Redis for caching, FluentD for log data, game engines for network messages, and many real-time API systems. MessagePack can be up to 4× smaller than equivalent JSON for numeric-heavy data.
Unlike JSON, MessagePack is a binary format and is not human-readable. This tool shows both the raw hex dump and Base64 encoding so you can inspect or transmit the encoded data as text. Libraries for decoding MessagePack are available in every major language.