SSL Certificate Checker

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.

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.

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.

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.

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.

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.

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.

Type the hostname exactly as visitors reach it, www included if that is how the site is served, then press Check. The tool opens a live TLS handshake and reads the certificate off the connection, so you can check ssl certificate fields like issuer, subject, and expiry in one pass.

Yes, that is the point of it. You can check ssl certificate online from any browser with no install and no command line, and the query runs server side so nothing depends on your local machine. It is handy right after an install to confirm the new certificate is actually being served.

The headline banner shows days remaining, turning amber under 30 days and red under 7, so you can check ssl certificate validity without reading dates. Under it, the valid-from and valid-to rows spell out the window, which is also how you check https validity for the padlock visitors see.

It completes a real handshake with the host and reports the certificate the server presents, rather than reading a cached database. That live read is what makes the ssl certificate verification trustworthy, because you are seeing exactly what a visitor's browser would receive at that moment.

Completely. The ssl checker tool has no account, no quota, and no email capture, so you can run as many checks as a renewal week demands. Each field, from fingerprint to protocol, has its own copy button for pasting into tickets.

Yes, though read the subject carefully. When you check ssl certificate of a website behind a CDN, the ssl checker online returns the edge certificate the proxy presents, which often names the CDN with your domain in the SAN list rather than the origin server's own cert.

No, and it is honest about that. It is a website security check online free for the TLS layer only, meaning the certificate and protocol, not a scan for vulnerabilities or misconfigured pages. For response-header hardening, pair it with the HTTP Headers Checker.

It covers whether the certificate is present, valid, current, and negotiated over a modern protocol. So when you check website security online here, treat it as the encryption checkpoint; to test website security online more broadly you would add header, redirect, and content checks from other tools.

The ssl cert checker reports issuer, subject, valid-from and valid-to dates, days remaining, negotiated protocol, and the SHA-1 fingerprint. That set answers the common questions: is this the right certificate, whose is it, and how long until it needs renewing.

The ssl verify result confirms the host completed a TLS handshake and shows the certificate it presented, including its dates and issuer. Keep in mind ssl verification here reports what the server serves; if the handshake fails outright you get an error, which is often a sign of a broken or incomplete chain.

Yes. Enter the exact subdomain and the tool will check web certificate data for that label, which may be a wildcard, a SAN entry, or its own separate cert. Running check website certificate per hostname is the only reliable way to know which one a subdomain uses.