~/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 61 more days.
── output ─────
Issued to
gmail.com
Issued by
WR2
Valid from
2026-03-30
Valid until
2026-06-22 (61 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
F0:46:C5:75:99:A6:87:F2:1A:14:4B:F5:61:2C:3B:7D:5C:97:2D:87:41:0D:97:F2:2A:F5:EA:C4:5E:2B:BB:9C
Serial
91D00E36DF448DF41079231C72ED31E6
subject_alt_names · 2
gmail.com *.gmail.com
certificate_chain · 3 certs
[ leaf ]gmail.com
61 days left
issuer: WR2
2026-03-30 → 2026-06-22
[ inter ]WR2
1035 days left
issuer: GTS Root R1
2023-12-13 → 2029-02-20
[ inter ]GTS Root R1
646 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 →