SSL Expiry Checker
Check any domain's SSL certificate expiry date, issuer, and validity details online for free with our ssl expiry checker. Get the full certificate report including protocol, SANs, and days remaining - with color-coded status and renewal warnings. No signup required.
Enter any domain name to check its SSL certificate expiry date, issuer, validity period, and key details. Results are fetched via a public SSL API - no signup required.
Enter a domain name (e.g. google.com) - https:// prefix is optional
Why Use Our SSL Expiry Checker?
Instant SSL Certificate Check
Check any domain's SSL certificate expiry date and issuer instantly. Our ssl expiry checker retrieves live certificate data in seconds - no waiting, no software, no signup required.
Secure SSL Expiry Checker Online
Only the domain name is sent to the SSL API to retrieve certificate data. No other information leaves your browser. Use our ssl expiry checker online with complete confidence in your privacy.
SSL Expiry Checker Online - No Installation
Use our ssl expiry checker directly in any browser with no downloads, plugins, or extensions required. Check SSL certificate expiry for any domain from any device, completely free.
Complete Certificate Details
Get the full SSL certificate picture - expiry date, issuer, subject, protocol, signature algorithm, key size, and all Subject Alternative Names (SANs). Our ssl expiry checker shows everything in one view.
Common Use Cases for SSL Expiry Checker
Website Maintenance & Monitoring
Web administrators use our ssl expiry checker to monitor certificate expiry dates across their domains. Check before renewals are due to avoid unexpected HTTPS failures that break user trust and SEO rankings.
DevOps & Infrastructure Audits
DevOps engineers use our ssl expiry checker to audit SSL certificates across staging, production, and API domains. Identify certificates expiring within 30 days before they cause deployment incidents.
Client Website Management
Web agencies and freelancers use our ssl expiry checker to verify SSL status for client websites. Quickly confirm that certificates are valid and identify which clients need renewal reminders.
Security Compliance Checks
Security teams use our ssl expiry checker to verify that certificates use modern protocols (TLS 1.2+) and strong signature algorithms. Identify outdated or weak certificates that need upgrading.
Pre-Launch Website Verification
Developers use our ssl expiry checker before launching new websites to confirm SSL is correctly configured. Verify the certificate covers all required domains and subdomains via the SAN list.
Troubleshooting HTTPS Errors
Support teams use our ssl expiry checker to diagnose HTTPS certificate errors reported by users. Instantly check if a certificate is expired, misconfigured, or issued for the wrong domain.
Understanding SSL Certificates and Expiry
What is an SSL Certificate?
An SSL/TLS certificate is a digital certificate that authenticates a website's identity and enables an encrypted HTTPS connection between a browser and a web server. Every SSL certificate has a validity period - typically 90 days (Let's Encrypt) or 1 year (commercial CAs) - after which it expires and must be renewed. An expired certificate causes browsers to display security warnings that block users from accessing your site, damaging trust and SEO rankings. Our ssl expiry checker retrieves live certificate data so you can monitor expiry dates and act before certificates expire.
How Our SSL Expiry Checker Works
- 1. Enter the Domain Name: Type or paste any domain name into the input field (e.g. google.com). The ssl expiry checker automatically strips https:// prefixes and paths, so you can paste a full URL and it will extract the domain correctly.
- 2. Live Certificate Lookup: Click Check SSL Certificate and the tool queries a public SSL API to retrieve the live certificate data for your domain. The API connects to the domain's server and reads the TLS certificate details in real time.
- 3. Review the Full Certificate Report: View the expiry status, days remaining, valid from/to dates, issuer, subject, protocol, signature algorithm, key size, and all Subject Alternative Names (SANs) in a clear, color-coded report.
What the SSL Expiry Checker Shows
- Expiry Date & Days Remaining: The certificate's expiry date in human-readable format and the exact number of days until expiry. Color-coded status: green (60+ days), yellow (31-60 days), orange (15-30 days), red (0-14 days or expired).
- Issuer & Certificate Authority: The Certificate Authority (CA) that issued the certificate - such as Let's Encrypt, DigiCert, Sectigo, or Comodo. The issuer name helps verify the certificate is from a trusted CA.
- Subject Alternative Names (SANs): The list of all domains and subdomains covered by the certificate. A wildcard certificate (*.example.com) covers all subdomains. SANs confirm whether a certificate covers the specific domain you need.
- Protocol & Signature Algorithm: The TLS protocol version (TLS 1.2, TLS 1.3) and signature algorithm (SHA-256, SHA-384) used by the certificate. Modern certificates should use TLS 1.2+ and SHA-256 or stronger.
When to Renew Your SSL Certificate
Most Certificate Authorities recommend renewing SSL certificates at least 30 days before expiry. Let's Encrypt certificates (90-day validity) should be renewed at 60 days. Commercial certificates (1-year validity) should be renewed at 30 days. Set calendar reminders or use automated renewal tools like Certbot for Let's Encrypt. Our ssl expiry checker shows a renewal warning when fewer than 30 days remain, giving you clear guidance on when to act.
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Frequently Asked Questions About SSL Expiry Checker
What is an SSL expiry checker?
An SSL expiry checker is a tool that retrieves the SSL/TLS certificate for a domain and shows its expiry date, issuer, and validity details. Our ssl expiry checker queries a live SSL API to get real-time certificate data for any publicly accessible domain.
How do I check when my SSL certificate expires?
Enter your domain name (e.g. example.com) into our ssl expiry checker and click Check SSL Certificate. The tool instantly shows the expiry date, days remaining, issuer, and full certificate details. No login or software installation required.
What happens when an SSL certificate expires?
When an SSL certificate expires, browsers display a security warning that blocks users from accessing your website. This causes immediate loss of traffic, damages user trust, and can negatively impact SEO rankings. Renew your certificate before it expires to avoid these issues.
How often should I check my SSL certificate expiry?
Check your SSL certificate expiry at least once a month, and set a renewal reminder 30-60 days before the expiry date. For Let's Encrypt certificates (90-day validity), check every 2 months. Our ssl expiry checker makes it easy to verify any domain in seconds.
What are Subject Alternative Names (SANs) in an SSL certificate?
Subject Alternative Names (SANs) are the list of all domains and subdomains covered by a single SSL certificate. A wildcard certificate (*.example.com) covers all subdomains. Our ssl expiry checker displays all SANs so you can verify the certificate covers every domain you need.
What TLS protocol version should my certificate use?
Your server should use TLS 1.2 or TLS 1.3. TLS 1.0 and 1.1 are deprecated and insecure. Our ssl expiry checker shows the protocol version so you can identify servers that need upgrading to modern TLS standards.
Is this SSL expiry checker free to use?
Yes! Our ssl expiry checker is 100% free with no signup, no account, and no usage limits. Check SSL certificate expiry for any domain directly in your browser.
Is my domain name safe when using this SSL expiry checker?
The domain name you enter is sent to a public SSL API to retrieve the certificate data. No other information is transmitted. The SSL API connects to the domain's server to read the public certificate - the same information any browser can see.
Why does the SSL expiry checker show an error for my domain?
Common reasons include: the domain does not have an SSL certificate, the domain does not exist or is unreachable, the certificate is self-signed (not trusted by public CAs), or the SSL API is temporarily unavailable. Try again after a few seconds or verify the domain is publicly accessible.