Free tools SSL Checker
SSL checker,
graded A+ to F.
Check a site's certificate and HTTPS set-up the way a browser does: whether it is trusted, when it expires, the chain behind it, the TLS versions it accepts, and a grade with the reasons.
How the grade works
The grade answers one question: would a browser trust this connection, and is it as safe as it should be? An F means visitors see a warning or the connection is unsafe: an expired, self-signed or untrusted certificate, one that does not cover the name, a weak key, SHA-1, or nothing newer than TLS 1.1. Still accepting the retired TLS 1.0 or 1.1 caps it at B. No TLS 1.3 is A-. A trusted, modern set-up is A, and HSTS for six months or more makes it A+.
Why expiry catches people out
Most certificates now renew themselves, every 90 days or less. That is why expiry still takes sites down: when automatic renewal quietly breaks, nobody is looking, and the first sign is a full-page warning in front of every visitor. Monitoring is how you hear about it while there is still time.
Questions
What does an SSL grade of A+ mean?
The certificate is trusted and current, the server uses modern TLS only, and HSTS tells browsers to always use HTTPS. It is the best grade.
Why is my grade B?
The server still accepts TLS 1.0 or 1.1, which were retired in 2021. Turning them off, often a single setting on your CDN or server, raises the grade.
What is a certificate chain?
Your certificate is signed by an intermediate authority, which is signed by a root that browsers trust. The server has to send the intermediate; if it does not, some browsers and apps cannot verify the certificate.
Can I get an alert before my certificate expires?
Yes. WebRankPage SSL monitoring checks your certificate and emails you before it expires and if browsers stop trusting it. A free account includes one certificate.
Every check, on one page, ranked by what matters.
These tools each answer one question. A WebRankPage report answers all of them at once for a page, and more than fifty others, with the evidence from your own source and the fix for each.