---
title: tls.client.certificate.raw_certificate_b64
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/tls-client-certificate-raw-certificate-b64
---

**Type:** STRING  
**Access:** read-only

**Available in:** recv, hash, deliver, log

The client raw certificate is a base64 encoded string of the X509 PEM format certificate used to authenticate the client during mTLS handshake. Limited to 4KiB.