SSLWatchSSL certificate expiration checker
Check when any website's SSL certificate expires – exact expiry date, days remaining and domain registration expiry, in one second.
Try: google.com · github.com · cloudflare.com
How to check an SSL certificate expiration date
- Type the domain (for example
example.com) above. - Read Certificate expires in … days and the exact "valid until" date and time in UTC.
- Click Add expiry reminder to save a calendar alert 14 days before expiry.
Checking many sites?
Use the bulk SSL expiry checker to check up to 20 domains and export a CSV.
Certificate lifetimes are shrinking to 47 days by 2029 – see the timeline.
Frequently asked questions
How do I check the SSL certificate expiration date of a website?
Enter the domain in the SSL expiration checker. It connects over HTTPS and reads the certificate "Not After" date, showing the expiry date and the number of days left.
How often should I check SSL expiry?
Automate renewal and check at least weekly. Certificates are getting shorter lifetimes (200 days in 2026, 47 days by 2029), so monitoring matters more.
What happens when an SSL certificate expires?
Browsers show "Your connection is not private" (NET::ERR_CERT_DATE_INVALID), and apps and APIs refuse to connect until the certificate is renewed.
Can I check the expiry date from the command line?
Yes: echo | openssl s_client -connect example.com:443 -servername example.com | openssl x509 -noout -enddate