CBOR
Encode JSON to CBOR (binary) and decode back — hex & Base64. Everything runs on your device — nothing is sent to a server.
The result will appear here…
or press Ctrl+Enter
Everything runs in your browser. Your data is never sent to our servers.
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Example
Example Input
{"a":1,"b":[2,3]}Example Output
Hex: a2 61 61 01 …
How to Use
- 1Paste your data into the Input field.
- 2If the tool has "More settings" (mode, query, columns, etc.), set them as needed.
- 3Click the button (or press Ctrl+Enter) to process.
- 4Copy the result with the Copy button.
About CBOR
CBOR (Concise Binary Object Representation, RFC 8949) is a binary serialization format based on the JSON data model, designed for small size and fast processing — used in IoT, COSE, and WebAuthn.
This tool encodes JSON data into CBOR bytes (hex and Base64) and decodes them back into JSON.
Processed in the browser with cbor-x. Similar to MessagePack but an IETF standard. See MessagePack for the alternative.
FAQ
Is my data sent to a server?
No. CBOR runs entirely in your browser using client-side libraries. Your data never leaves your device.