Adds support for the WebAuthn largeBlob [1] client authenticator extension. This extension allows relying parties to store opaque data associated to a credential. [1]


Storing information such as certificates associated to a WebAuthn credential.


Specification link

Specification being incubated in a Community Group

Status in Chromium


In developer trial (Behind a flag) (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • No signal
  • No signal
  • No signals


Intent to Prototype url

Intent to Prototype thread

Search tags

webauthn, large blob, blobs,

Last updated on 2021-12-07