CBOR to XML Converter
Processing entirely on your device — large files may take a moment.
CBOR is binary JSON under an IETF standard (RFC 8949) — same data model, a fraction of the size, used by COSE, WebAuthn and IoT devices. XML is still required by many enterprise imports, sitemap generators and older APIs.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How CBOR compares to XML
| CBOR | XML | |
|---|---|---|
| Structure | Binary tagged values | Trees with namespaces |
| Types / schema | Numbers, strings, arrays, maps | Optional XSD validation |
| Compatibility | WebAuthn, COSE, IoT | Enterprise and publishing standard |
| Best for | Compact machine-to-machine data | Validated interchange, documents, RSS |
How to convert CBOR to XML
- 1
Select your files
Drag & drop your CBOR files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to XML". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted XML file individually, or grab everything at once as a ZIP archive.
About the CBOR format
CBOR (RFC 8949) is what happens when JSON decides to stop wasting bytes: the same objects, arrays, strings and numbers, but length-prefixed binary instead of text. It is the credential format inside WebAuthn passkeys, the payload format of COSE signing and a favourite of embedded devices that cannot afford verbose JSON.
Decoding CBOR to JSON is the everyday debugging move: dump what a token, sensor or authenticator actually sent, then read it like ordinary JSON. The mapping is lossless for the data model both formats share.
+ Strengths
- ✓IETF standard with a strict data model
- ✓Much smaller than equivalent JSON
- ✓Round-trips to JSON without data loss
! Limitations
- −Not human-readable without a decoder
- −Fewer tools speak it than JSON
About the XML format
XML (W3C, 1998) is the enterprise ancestor of JSON: angle-bracketed elements with attributes, nested into trees, carrying optional namespaces, schemas (XSD) and transformation tooling (XPath, XSLT). Office documents, RSS feeds, SOAP services, Android layouts and thousands of industry interchange standards (HL7, METS, SBML) are built on it.
It remains the right choice where validation and self-description matter more than brevity: schemas catch malformed documents at the door, namespaces let multiple vocabularies coexist in one file. The price is verbosity — XML files run two to four times larger than the same JSON, and hand-reading deeply nested XML is nobody's hobby.
+ Strengths
- ✓Schema validation catches bad data at the boundary
- ✓Namespaces and attributes model rich semantics
- ✓Decades of enterprise tooling (XPath, XSLT, SOAP)
! Limitations
- −Verbose — 2–4× larger than equivalent JSON
- −Harder to read by hand
- −Modern web APIs have moved on to JSON
Why convert CBOR to XML?
Converting makes sense where the strengths of XML meet what CBOR cannot give you. Schema validation catches bad data at the boundary Meanwhile Not human-readable without a decoder One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this CBOR to XML converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for CBOR to XML?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Is my data safe here?
Yes. The conversion is plain JavaScript running in your tab: the data is parsed and re-serialized in memory, never sent anywhere, and disappears when you close the page.
How large can my CBOR file be?
Since everything runs locally in your browser, the real limit is your device memory rather than an upload cap. Files up to a few hundred megabytes are usually fine on a modern computer; extremely large ones simply take longer.