How to use
01
Enter the hostname
Type the name exactly as visitors reach it, www included if that's how the site is served. Certificates are issued per name, so www.example.com and example.com can carry different ones.
02
Click Check
The server opens a live TLS connection to the host and pulls the certificate it presents. Nothing is cached, so what you see is what the server is serving right now.
03
Read the status banner and fields
Days remaining appears on a color-coded banner, followed by issuer, subject, valid from and to dates, protocol, and fingerprint, each with its own copy button.
Why SSL Certificate Checker
- Direct TLS handshake, reads certificate from the host.
- Issuer, subject, validity dates, days remaining, fingerprint.
- Color-coded expiry warning if <30 days left.
Common questions
How does the SSL checker decide the banner color?
Green means 30 or more days of validity remain, amber means fewer than 30, and red means fewer than 7. Amber is your cue to schedule the renewal, and red means do it today, because expiry produces a full browser warning page for every visitor.
Can I check ssl expiry for a subdomain like shop.example.com?
Yes, enter the subdomain itself. It may be covered by a wildcard, by a SAN entry on the main certificate, or by its own separate cert with its own expiry date, and the only way to know which is to test that exact hostname.
Why does my certificate issuer show a name I don't recognize?
Certificate authorities sign through intermediate certificates with their own names, and resellers add another layer of branding. A cert bought through your host may show an issuer you've never heard of, which is fine as long as browsers trust the chain.
What should the Protocol field say in a healthy TLS certificate result?
TLSv1.3 is the current best, and TLSv1.2 remains acceptable. If the field reports TLSv1.1 or older, the server needs a configuration update, since browsers have deprecated those versions and compliance scanners will flag them.
Is a certificate with only 90 days of validity a problem?
Not at all, that's the standard Let's Encrypt lifetime and the industry keeps pushing lifetimes shorter. Short-lived certs are meant to be renewed by automation, so the real question is whether your renewal job is running, not whether 90 days is enough.
Does the SSL check validate the full certificate chain?
It completes a standard TLS handshake and reports the certificate the server presents. When the handshake fails outright you'll see an error instead of results, and a broken or incomplete chain is one of the most frequent causes of exactly that failure.
Why does the certificate Subject differ from the domain I typed?
Wildcards and shared certificates cause this constantly. A subject of *.example.com covers shop.example.com, and CDN-hosted sites often present a certificate whose subject names the CDN, with your domain tucked into the SAN list instead.