CertChain Inspector

About

CertChain Inspector lets developers, security researchers, and curious users 
dig into the complete SSL/TLS certificate chain of any HTTPS website — 
directly from the browser toolbar.

--- WHAT IT SHOWS----
• Full certificate chain (leaf → intermediate → root)
• Subject & Issuer (Common Name, Organization, Country, etc.)
• Validity period with color-coded status (valid / expiring soon / expired)
• Subject Alternative Names (SANs)
• Serial number & signature algorithm
• SHA-256 and SHA-1 fingerprints
• TLS protocol version, cipher suite, and key exchange details

── EXPORT & COPY ──
• Export button downloads a structured .txt summary of the leaf certificate
• One-click copy of the SHA-256 fingerprint to clipboard

── PRIVACY ──
This extension does not collect, transmit, or store any data.
Certificate data is read on-demand and held only in memory for the 
current session. It is never written to disk, sent to a server, 
or shared with any third party.

⚠ NOTE — "Debugging this browser" banner:
When you click the extension icon, Chrome briefly shows a yellow 
"DevTools is debugging this browser" banner for 1–3 seconds. 
This is a mandatory Chrome security notice and cannot be suppressed. 
It appears because the extension uses the Chrome Debugger Protocol . 
The debugger is detached immediately after the certificate data is retrieved.

── WHO IS IT FOR? ──
• Web developers verifying certificate deployments
• Security engineers auditing certificate chains
• IT admins checking expiry dates and issuers

No account required. No ads. No analytics. Open source.