SSL certificate expiry checker
Enter a domain to see whether its HTTPS certificate is trusted, who issued it, and how many days are left before it expires.
Why this matters for email
Every link in your emails points at your website. An expired or mismatched certificate puts a full-page browser warning between your reader and your offer. Spam filters also look at the reputation of linked sites.
Most certificates now auto-renew every 60 to 90 days, and maximum lifetimes are shrinking under the CA/Browser Forum schedule that began in March 2026. When renewal silently fails, nobody notices until the site is already broken.
Monitor it instead of checking by hand
Get a warning 14 days before your certificate expires. Plans from $9/month after a 14-day free trial. No card to start.
Questions
Do you check the mail server certificate too?
This tool checks the HTTPS certificate on port 443 of the domain itself. Monitoring plans watch the same certificate and warn you 14 days before it expires.
More free checks
- Email domain health check
- SPF record checker
- SPF “too many DNS lookups” checker
- DMARC record checker
- DKIM record checker
- MX record lookup
- SPF record generator
- DMARC record generator