~/tools / ssl-checker

SSL Checker

Check SSL certificate expiry, chain validity, TLS version and cipher. Catches expired certs, weak crypto and chain issues.

[ OK ] Valid for 58 more days.

── output ─────

Issued to: gmail.com
Issued by: WR2
Valid from: 2026-04-08
Valid until: 2026-07-01 (58 days)
TLS version: TLSv1.3
Cipher: TLS_AES_256_GCM_SHA384
Key: EC (prime256v1) · 256 bit
Signature: sha256WithRSAEncryption
Forward secrecy: yes
Self-signed: no
Must-staple: no
SHA-256 fingerprint: CA:4D:A3:8B:24:39:CD:DD:74:14:6E:59:75:FB:FB:C4:1A:36:35:D1:54:5B:FB:08:88:68:F1:FA:88:02:80:66
Serial: 8A63A706C75FDED2129DE3EEE794E0EB

subject_alt_names · 2

gmail.com *.gmail.com

certificate_chain · 3 certs

[ leaf ]gmail.com

58 days left

issuer: WR2

2026-04-08 → 2026-07-01

[ inter ]WR2

1023 days left

issuer: GTS Root R1

2023-12-13 → 2029-02-20

[ inter ]GTS Root R1

634 days left

issuer: GlobalSign Root CA

2020-06-19 → 2028-01-28

// Save gmail.com → we'll run this daily and alert on changes. /signup →