TLS Certificate Inspector

🔐

tls

Input

Target: hostname or HTTPS URL.

Output

Leaf certificate subject and issuer.
Certificate expiry date and days remaining.
Signature algorithm and public key details (when available).
Subject Alternative Name (SAN) entries.
Issuer chain summary.
Weakness warnings (expired, weak signature algorithm, weak key size, missing SAN, hostname mismatch).

Tips

Use against production domains and internal endpoints to catch renewal or configuration issues early.
If the handshake fails, you may still get partial certificate details plus a handshake note.

Deeplink

netdebug://tls?target=https://example.com

Tip: in the app, open the Export menu (the share icon) on this screen and choose Copy Deeplink to copy this link as a Universal Link with your current target and options already filled in.