Credential ID Inspector
Inspect a WebAuthn credentialId. Reports length, Shannon entropy, common envelope shapes, and any AAGUID-shaped prefix vendors prepend. Diagnostic only — credentialIds are opaque to the RP.
Input
Inspection
Paste a credentialId.
All decoding runs locally.
About credentialId
credentialId is opaque to the relying party. Some authenticators store the underlying credential locally and return a small ID (resident / discoverable creds); others wrap an encrypted blob in the ID itself (server-side resident — credential lives on the server, key wrap lives on the authenticator). Either is spec-compliant.