Check a website’s SSL certificate online to see when it expires, who issued it, which domain names it covers, and whether its HTTPS certificate can be verified.
Enter a public website domain, such as example.com, or a full HTTPS address. Our SSL Certificate Checker retrieves certificate details and shows the results in an easy-to-understand format.
Check an SSL Certificate
SSL Certificate Checker
Check a website's HTTPS certificate expiry, issuer, domain coverage and server-side verification result.
This test connects from the PTCLSpeedTest website server, not your browser. Results describe the certificate returned on that route at the check time. A valid certificate alone does not prove the website is safe.
How to Check an SSL Certificate Online
Checking an HTTPS certificate takes just a few steps:
- Enter the website address. Type a domain such as
example.comor an HTTPS URL such ashttps://example.com. - Click Check Certificate. The checker connects to the website’s HTTPS server and attempts to retrieve its certificate.
- Review the certificate status. See whether the certificate was verified, has expired, is approaching expiry, or could not be verified.
- Examine the details. Check the expiration date, issuer, certificate subject, covered domain names, and other available information.
You do not need to own the website or enter a username or password.
The tool accepts public domain names and standard HTTPS connections on port 443. It does not support private network addresses, direct IP-address checks, or custom ports.
Understanding Your SSL Certificate Results
The checker provides several details about the certificate returned by the website.
| Result | What It Means |
|---|---|
| Certificate Status | Whether the certificate was verified, is approaching expiry, has expired, is not yet valid, or could not be verified |
| Issuer | The certificate authority or issuing organization identified in the certificate |
| Valid From | The date and time the certificate’s validity period begins |
| Expires On | The certificate’s expiration date and time |
| Time to Expiry | The approximate number of whole days remaining |
| Certificate Subject | The common name recorded in the certificate |
| DNS Names (SAN) | Domain names listed in the certificate’s Subject Alternative Name extension |
| SHA-256 Fingerprint | A cryptographic fingerprint that helps identify the particular certificate |
| Server-Side Verification | Whether this checker’s server could validate the certificate and hostname using its local trust configuration |
Certificate dates are displayed in Coordinated Universal Time (UTC). The expiration countdown depends on the time remaining when the check is performed.
What Does Certificate Verified Mean?
A verified result means the checker successfully validated the certificate for the requested hostname using its server’s certificate trust settings.
It indicates that the certificate passed this particular verification check. It does not guarantee that the website is legitimate, malware-free, or completely secure.
What Does Certificate Expires Within 30 Days Mean?
This warning indicates that the certificate was verified but is close to its expiration date.
If you manage the website, inspect the certificate renewal settings and confirm that automatic renewal is functioning. Renew or replace the certificate before it expires.
What Does Certificate Expired Mean?
An expired certificate has passed its recorded validity end date.
Visitors may encounter browser security warnings, and some applications may refuse to establish a trusted connection.
Website owners should renew or replace the certificate and confirm that the server is presenting the updated certificate.
What Does Certificate Could Not Be Verified Mean?
The tool retrieved a certificate, but its server could not verify it successfully.
Possible reasons include an untrusted issuing authority, an incomplete certificate chain, or a domain-name mismatch.
This status does not identify the exact cause. Check the website in a current browser and investigate the hosting server’s TLS configuration.
Why Is an SSL Certificate Important?
An SSL certificate, more accurately called a TLS certificate in modern HTTPS connections, helps a browser authenticate the website it is connecting to.
When correctly configured, HTTPS uses Transport Layer Security (TLS) to encrypt information exchanged between the browser and website.
Certificates support this process by connecting a website’s identity to a public cryptographic key through a certificate validation system.
For website owners, expired or incorrectly configured certificates can interrupt normal access, produce browser warnings, and affect services that depend on HTTPS.
However, an HTTPS certificate is not proof that a website’s content, products, or operators are trustworthy. Malicious websites can also use valid HTTPS certificates.
How to Fix Common SSL Certificate Problems
The correct solution depends on the certificate status and the website’s hosting configuration.
1. SSL Certificate Has Expired
Open your hosting control panel or certificate management service and check the renewal status.
If renewal failed, follow your hosting provider’s instructions to renew or reissue the certificate. Confirm that the web server or CDN is serving the replacement certificate.
Run another check after the updated certificate is deployed.
2. SSL Certificate Does Not Match the Domain
Check whether the certificate covers the exact hostname visitors use.
For example, example.com and www.example.com are different hostnames. A certificate must provide appropriate coverage for each hostname that requires HTTPS.
Inspect the Subject Alternative Name (SAN) entries and correct the certificate or website configuration if a required hostname is missing.
3. Certificate Chain Cannot Be Verified
An HTTPS server may present a certificate without correctly providing the required intermediate certificates.
Review the installed certificate chain and follow your certificate authority’s or hosting provider’s deployment instructions.
Avoid bypassing certificate validation merely to remove a warning.
4. HTTPS Certificate Cannot Be Retrieved
The checker may fail when the website is unreachable from the checking server, DNS resolution fails, or TLS negotiation cannot be completed.
Confirm that the domain is correct and that HTTPS is available on port 443.
If the website opens normally in your browser but the checker cannot connect, the difference may be related to hosting firewall restrictions, server configuration, or network routing.
How Our SSL Certificate Checker Works
The PTCLSpeedTest SSL Certificate Checker uses a server-side connection rather than attempting to inspect certificates directly from your browser.
When you submit a public domain name, the WordPress server resolves the hostname and attempts to establish a TLS connection to the website on port 443.
The checker reads the certificate presented by the destination server and extracts its available identity and validity information.
It attempts to validate the certificate using the checking server’s trust settings. If full verification fails but the certificate can still be retrieved, the result is marked as not verified rather than being treated as successful.
Results may be cached for up to five minutes. A recently renewed certificate may therefore require another check after the cache has expired.
Important Limitations
This tool examines the certificate returned along the connection from the PTCLSpeedTest hosting server. A different location, CDN server, or DNS response may produce a different result.
It is not a complete website security scanner. It does not provide a full TLS configuration audit, test supported TLS versions, inspect mixed content, scan for malware, or guarantee browser compatibility.
The checker retrieves the certificate for the requested hostname. It does not download and inspect the website’s individual pages.
Who Can Use This SSL Certificate Checker?
This tool can help:
- Website owners check certificate expiry after installation or renewal.
- WordPress administrators investigate HTTPS certificate warnings.
- Web developers review certificate issuer information and hostname coverage.
- Hosting customers verify the certificate their public website is presenting.
- General internet users investigate whether a website’s HTTPS certificate has expired.
The tool is useful for checking websites hosted in Pakistan or elsewhere. Certificate verification depends on the website’s configuration and the checking server, not the visitor’s internet provider.
Can You Check SSL Certificates for Subdomains?
Yes. You can enter a public subdomain such as shop.example.com to inspect the certificate returned for that specific hostname.
Checking a main domain does not automatically establish that every subdomain is correctly configured.
If your website uses several hostnames, check each important hostname separately.
Does This Tool Renew SSL Certificates?
No. The SSL Certificate Checker is a diagnostic tool. It reads certificate information but cannot renew, install, replace, or modify a website’s certificate.
If renewal is required, use the certificate management facilities provided by your web host, certificate authority, or server administrator.
Keep Your Website’s HTTPS Certificate Up to Date
An SSL certificate may be valid today but expire in the future. Website owners should maintain working certificate renewal arrangements and verify that renewed certificates are actually deployed.
If you have recently changed hosting providers, added a subdomain, or modified your CDN configuration, checking the certificate again can help identify deployment problems.
Use the checker whenever you need to review your website’s certificate expiration date and verification status.
About this tool: PTCLSpeedTest is an independent connectivity and internet tools website. SSL certificate results are informational and should not be treated as a complete security assessment.