TheSeoSoul
Free tools/Technical

Free SSL Days Checker

See how many days remain on the site's TLS certificate, who issued it, and whether HTTPS redirects stay on HTTPS — free, no signup.

How it works

  1. 01

    Probe TLS on port 443

    We connect with SNI for the hostname and read the presented certificate’s not-after date.

  2. 02

    Compute days remaining

    Expiry under 21 days is flagged as a warning; expired certs fail clearly.

  3. 03

    Trace HTTPS redirects

    A short redirect trace confirms the final URL still uses HTTPS after hops.

What we check

  • Certificate validity window (days remaining)
  • Issuer organization / CN when available
  • Whether the final URL after redirects is HTTPS
  • Redirect hop chain for the HTTPS entry URL

When to use an SSL days checker

Put this on a calendar before Let’s Encrypt renewals, CDN cutovers, or apex/www migrations. Combine with the Security Headers Checker for HSTS after HTTPS is stable.

Frequently asked questions

What does the SSL days checker show?
It opens a TLS connection to the hostname, reads the peer certificate, and reports days remaining, expiry time, and issuer — plus whether HTTPS redirects land on HTTPS.
Why do certificate days matter for SEO?
Expired certificates trigger browser warnings, kill trust, and can interrupt crawling. Renew before the last 21 days so automation and humans are not surprised.
Does this validate the full certificate chain?
It reads the presented leaf certificate. Deep chain / CT / pinning audits are out of scope for this free check.
Is this free?
Yes — free, no registration on TheSeoSoul.

Keep going

What to check next

TLS is table stakes — check headers and crawl discovery next.

Need the whole picture? Run a full audit · browse every tool.