Your Step-by-Step Guide to Check SSL Certificate Validity

SSL certificate validity is the current, verifiable state of a website’s TLS certificate: not expired, issued by a trusted Certificate Authority, matching the site’s domain name, and unrevoked. Browsers check all four conditions on every HTTPS connection. If any one fails, the browser blocks or warns instead of connecting, so checking validity regularly is a basic security and compliance task.

SSL/TLS certificates are digital certificates that prove a website’s identity and enable a secure, encrypted connection between your browser and the website’s server. When you visit an HTTPS site, the server presents its TLS certificate, and your browser checks that it’s valid, matches the website’s domain name, and is trusted through a recognized Certificate Authority.

Key Takeaways

• A valid SSL/TLS certificate must pass four checks: unexpired, domain match, trusted CA chain, and not revoked.
• Certificates come in three validation levels, Domain Validation (DV), Organization Validation (OV), and Extended Validation (EV), which differ in identity vetting, not encryption strength.
• You can check a certificate’s validity directly in Chrome, Edge, or Firefox in under a minute, no tools required.
• Publicly trusted certificate lifetimes are shrinking fast: the CA/Browser Forum’s Ballot SC-081v3 cuts maximum validity from 398 days to 200 days (March 2026), 100 days (March 2027), and 47 days (March 2029).
• 72% of organizations have experienced a certificate-related outage, according to CyberArk’s 2025 State of Machine Identity Security Report, which is why manual tracking no longer scales.

What Is an SSL Certificate?

An SSL certificate, more accurately called a TLS certificate, is an X.509 digital certificate that binds a website identity, usually a DNS name, to a public key, signed by a Certificate Authority (CA). In practice, this certificate is the website’s machine-verifiable ID card. Browsers and operating systems validate that ID card by building a chain of trust from the site’s certificate through intermediate CAs up to a trusted root CA in the client’s trust store.

The certificate primarily enables authentication. It allows the client, whether a browser, API consumer, or service, to verify that the server it is connected to is authorized for the domain name it requested and that the certificate is currently valid. The client checks at least four items: the domain name must match the certificate’s permitted names (typically in the Subject Alternative Name), the certificate must be within its validity window, the certificate must be allowed for server authentication, and the signature chain must terminate at a trusted root.

A common misconception is that HTTPS means a site is safe. HTTPS means the connection is secured to the holder of that domain’s certificate. It does not, by itself, prove the organization behind the site is reputable or non-malicious.

For example, when a user navigates to https://portal.company.com, the server presents its certificate during the TLS handshake. If the browser confirms the certificate is issued by a trusted CA, matches portal.company.com, and is within date, the connection proceeds. If any check fails, an expired certificate, a hostname mismatch, or an unknown issuer, the browser will warn or block the page because it cannot safely confirm who is actually on the other end.

SSL Certificate Validation Levels: DV vs. OV vs. EV

SSL certificates are issued at three main validation levels. All three provide the same strength of encryption, but they differ significantly in how thoroughly the CA verifies the identity of the certificate holder. Domain Validation (DV), Organization Validation (OV), and Extended Validation (EV) define how much trust a user can place in the website’s identity, which matters for security assurance, user confidence, and compliance verification.

Domain Validation (DV)

DV only confirms that the applicant controls the domain name associated with the certificate. The CA typically verifies this through automated methods, such as confirming an email sent to the domain’s administrative address or requiring a specific DNS record or HTTP file on the domain. Because this involves no human identity verification, DV certificates can be issued within minutes to a few hours.

Organization Validation (OV)

OV certificates add a layer of identity verification. In addition to confirming domain control, the CA manually checks the organization’s legitimacy: company name, physical address, phone number, and official business registration details. This typically takes one to three business days and produces a certificate that includes the organization’s name and location, viewable by users in the certificate details.

Extended Validation (EV)

EV certificates follow a rigorous, standardized process defined by the CA/Browser Forum’s EV Guidelines, which require the CA to verify the organization’s legal, physical, and operational existence. The CA typically reviews official registration documents, obtains an independent legal opinion letter, and performs a final verification call with the organization. Because of this thorough process, issuance typically takes one to five business days or longer.

The table below summarizes the key differences across the three validation levels:

Feature	Domain Validation (DV)	Organization Validation (OV)	Extended Validation (EV)
Validation Level	Minimal (domain ownership only)	Moderate (domain + basic organization info)	Highest (in-depth business vetting)
Identity in Certificate	No organization details	Organization name and address included	Full organization details included
Issuance Time	Minutes to hours	1 to 3 business days	1 to 5 business days or more
Cost	Lowest	Moderate	Highest
Best Use	Blogs, personal sites, internal systems	Business sites, login pages	Banks, e-commerce, government services

How to Check an SSL Certificate’s Validity in Your Browser

Checking SSL certificates is both a security hygiene practice and a trust verification step. For users, it prevents exposure to spoofed or unsafe sites. For administrators, it confirms that encryption and authentication controls are properly configured.

The simplest first step is confirming the site uses HTTPS instead of plain HTTP, visible at the start of the URL. Google removed the padlock icon from Chrome’s address bar starting with Chrome 117 in September 2023, replacing it with a “tune” icon (two sliders), after research found most users misread the padlock as a general trust signal rather than an encryption indicator. Edge and Firefox still use a padlock-style icon. Whichever icon your browser shows, clicking it reveals whether the connection is secure, and most browsers still warn with a message like “Not Secure” or block the page if it is not.

For audit purposes, organizations should ensure all public-facing endpoints enforce HTTPS and use valid, non-expired certificates. An expired or mismatched certificate is both a user-experience issue and a control failure under most security frameworks.

Checking a certificate confirms four things:

• The certificate is valid: not expired or revoked.
• It is issued by a trusted CA.
• It matches the domain name you are visiting.
• The connection uses TLS encryption, preventing eavesdropping and tampering.

For site owners, regularly reviewing SSL details ensures certificates are correctly deployed, renewed before expiry, and aligned with compliance standards like NIST SP 800-52r2, ISO 27001, or PCI DSS v4.0.1 requirements for encryption in transit. For visitors, the same checks provide confidence that sensitive data, such as credentials or payment details, is transmitted securely and only to the legitimate site.

Google Chrome

1. Click the tune icon (two sliders) to the left of the address bar. On older versions you may still see a padlock.
2. Select “Connection is secure.”
3. A brief summary appears confirming your information is protected.
4. Click “Certificate is valid” to view more detail.
5. You’ll see the issuing CA, the validity period, and the subject name, the domain or organization the certificate was issued to.
6. Advanced users can also inspect the full certificate chain: server, intermediate, and root.

Microsoft Edge

Edge’s process closely mirrors Chrome’s because both run on the Chromium engine.

1. Click the padlock to the left of the URL.
2. Choose “Connection is secure.”
3. Edge displays a short confirmation that the site has a valid certificate issued by a trusted authority.

Click the small information or certificate icon in that window to open full certificate details, including the CA, validity dates, and encryption details. Verifying certificates on production sites regularly helps you catch expired or misconfigured certificates before customers do.

Mozilla Firefox

Firefox uses its own security UI but follows the same basic approach.

1. Click the padlock icon in the address bar.
2. Select “Connection Secure.”
3. Click “More Information.”
4. In the pop-up, select “View Certificate.”
5. You’ll see detailed information about the server certificate, any intermediate certificates, and the root CA.
6. The panel also shows the validity dates and validation type (DV, OV, or EV).

How to Check Your Own Website’s SSL Certificate Details

Finding and understanding your own SSL certificate details is essential to maintaining a secure and compliant web presence. Once you’ve obtained and installed an SSL/TLS certificate, ongoing visibility into its configuration and validity supports both customer trust and regulatory compliance.

Viewing Your Certificate in a Browser

If you manage only a few websites, you can verify your SSL certificate directly through your browser:

• In Chrome or Edge: Visit your site over https://. Click the tune icon or padlock, select “Connection is secure,” then “Certificate is valid.” You’ll see the issuing CA, the validity period, the encryption algorithm, and the domain name(s) covered.
• In Firefox: Click the padlock icon, then “Connection Secure,” then “More Information,” then “View Certificate.” This shows the server, intermediate, and root certificates, along with validity and ownership information.

This method works for quick checks but becomes cumbersome once you administer many certificates across environments or domains.

Using Your Certificate Authority’s Dashboard

Most commercial CAs provide a centralized management console where you can log in and review all your certificates in one place. A CA dashboard typically shows:

• Certificate status: active, expired, or pending renewal
• Issuance and expiration dates
• Validation type (DV, OV, or EV)
• Subject and SANs (domain names covered)
• Certificate chain and key length
• Renewal and revocation options

This centralized visibility helps you confirm at a glance that your SSL/TLS assets are valid and properly configured.

Monitoring Certificate Expiration and Renewal

Expired SSL certificates cause service interruptions, security warnings, and loss of customer trust. From a governance standpoint, an expired certificate is also a control failure, since encryption-in-transit requirements are no longer met.

To prevent this:

• Set up automated expiry alerts within your CA portal or a monitoring tool.
• Enable renewal automation wherever possible. A modern CLM solution, such as CertSecure Manager, supports full automation through ACME or API integration.
• Document renewal workflows as part of your security operations procedures to demonstrate continuous control during audits.

Frameworks such as ISO/IEC 27001, PCI DSS, and NIST SP 800-52r2 require operational assurance that keys and certificates remain valid. Regular monitoring satisfies both security and audit evidence requirements.

Why Certificate Validity Monitoring Matters More in the 47-Day Era

Here’s the part most guides skip: checking validity once is no longer enough, because the checking has to happen far more often. In April 2025, the CA/Browser Forum approved Ballot SC-081v3, which shortens the maximum lifetime of publicly trusted TLS certificates in three phases: 200 days starting March 15, 2026, 100 days starting March 15, 2027, and 47 days starting March 15, 2029, down from today’s 398-day maximum. As of this writing, the 200-day cap is already in effect. Every publicly trusted certificate is affected, though internal/private PKI is not governed by this rule and can keep longer lifespans if the organization sets its own policy.

That reduction multiplies renewal frequency roughly eight-fold by 2029, and the outage data already shows why that matters. According to CyberArk’s 2025 State of Machine Identity Security Report, 72% of organizations experienced at least one certificate-related outage in the prior year, and 34% experienced multiple outages. Separately, Keyfactor’s 2024 PKI and Digital Trust Report found the average organization experienced three certificate-related outages over a 24-month span, each taking roughly 5.3 hours combined to identify and remediate. Neither figure includes the reputational cost of a customer-facing “Not Secure” warning or a blocked API call.

Our take: teams that are still tracking certificates in a spreadsheet or a shared calendar reminder should treat the 2026 phase as the deadline to automate, not the 2029 phase. A spreadsheet that barely survives annual renewals will not survive six renewals a year, and by the time 47-day certificates are mandatory, discovery gaps (certificates nobody remembered existed) become the most common cause of outages, not expiry itself. If your team can’t answer “how many certificates do we have and when does each one expire” in under a minute, that’s the gap to close first, before picking a renewal automation tool.

Using Certificate Lifecycle Management (CLM) Solutions

For organizations managing dozens or thousands of certificates, manual tracking is not sustainable, especially as validity windows shrink toward 47 days. CLM solutions such as Encryption Consulting’s CertSecure Manager centralize certificate data and automate the entire lifecycle, covering issuance, discovery, renewal, and revocation. See the stages of a certificate lifecycle for how each of those steps fits together. These platforms can:

• Automatically discover certificates across servers and applications
• Map owners and dependencies for governance visibility
• Trigger renewal workflows before expiration
• Integrate with DevOps and CI/CD tools for automated provisioning
• Produce audit-ready reports showing certificate status and compliance posture

Checking your SSL certificate is more than a one-time validation; it’s an ongoing governance task. You can review certificate details manually through your browser, but at scale, rely on your CA’s dashboard or a dedicated CLM solution, and see how to avoid certificate outages for the inventory and monitoring practices that prevent the outage causes covered above. Always ensure you have:

• A full inventory of all certificates
• Expiration monitoring and renewal automation
• Documented lifecycle procedures for audits

Combining visibility, automation, and trusted CA services helps you maintain secure, compliant, uninterrupted encrypted communications, protecting both your users and your organization’s reputation.

CertSecure Manager: Your Compliance Partner in a Changing Cryptographic Landscape

CertSecure Manager has been at the forefront of supporting organizations in staying current with cryptographic policy transitions. As compliance standards evolve, whether through NIST recommendations, PCI DSS updates, or new industry mandates, CertSecure Manager helps businesses remain compliant without disruption.

How CertSecure Manager Keeps You Ahead

• Proactive compliance adaptation: CertSecure Manager continuously updates its compliance framework to align with evolving regulations like HIPAA, PCI DSS, GDPR, and NIST 800-131A.
• Automated updates for shorter validity periods: as the CA/Browser Forum’s 200-day, 100-day, and 47-day phases take effect, CertSecure Manager automates certificate renewals so the shrinking window doesn’t turn into a shrinking margin for error.
• Real-time monitoring and policy enforcement: organizations receive instant alerts on expiring certificates and non-compliant cryptographic configurations, helping prevent security lapses and regulatory penalties.
• Seamless integration with new standards: whether it’s post-quantum cryptography adoption or TLS certificate validity reductions, CertSecure Manager is built to integrate with new standards without a rip-and-replace migration.

With CertSecure Manager, your organization reduces the risk of service disruptions from non-compliant certificates and gains a platform built for long-term certificate lifecycle management, including the renewal frequency the 47-day schedule will require.

In addition to CertSecure Manager, Encryption Consulting’s PKI Assessment Service provides a comprehensive evaluation of your PKI infrastructure, helping you identify security gaps and prepare a roadmap for upcoming regulatory changes or a stronger certificate management strategy.

Conclusion

SSL/TLS certificate validity is not a one-time deployment check. It’s an ongoing operational and compliance control that directly affects confidentiality, integrity, and availability. A certificate that is expired, mis-issued, mismatched to the hostname, or improperly chained cannot be relied upon for endpoint authentication, and browsers and clients will typically warn, block, or fail the connection, creating immediate business impact.

Because many frameworks and audits depend on demonstrable encryption in transit and sound key management, certificate lapses can translate into failed control assertions, reputational harm, and avoidable incident response. With the CA/Browser Forum’s schedule cutting maximum validity to 47 days by 2029, the organizations that automate discovery, monitoring, and renewal now will handle that transition as a routine operational change. The ones still relying on spreadsheets will find out the hard way. Maintain an accurate inventory, enforce standards-based TLS configurations, protect private keys, monitor validity continuously, and automate renewal wherever possible. If you cannot prove your certificates are valid today, you cannot credibly claim secure communications today.

Frequently Asked Questions

How do I know if my SSL certificate is valid?

Click the padlock or tune icon in your browser’s address bar, then select “Connection is secure” and view the certificate details. A valid certificate shows an unexpired date range, a trusted issuing CA, and a domain name that matches the site you’re visiting. If any of those don’t check out, the browser will usually warn you before you even open the details.

What happens when an SSL certificate expires?

Browsers block the connection or show a prominent warning, such as “Your connection is not private,” instead of loading the site normally. Visitors can usually click through an advanced warning to proceed anyway, but most will not, and API clients or automated systems typically fail the connection outright with no way through.

How long is an SSL certificate valid for?

As of this writing, publicly trusted certificates max out at 200 days, down from 398 days before March 15, 2026. That cap drops to 100 days on March 15, 2027, and to 47 days on March 15, 2029, under CA/Browser Forum Ballot SC-081v3. Private, internal PKI is not bound by these limits and can use whatever lifespan your organization’s policy sets.

What’s the difference between DV, OV, and EV certificates?

All three encrypt traffic identically. They differ in identity verification: DV only confirms domain control and issues in minutes, OV adds manual verification of the organization’s legal details over one to three days, and EV requires the CA’s most rigorous vetting, including a verification call, over one to five business days or longer.

Does HTTPS mean a website is safe?

No. HTTPS confirms the connection to that specific domain is encrypted and that the certificate holder controls the domain, but it says nothing about whether the organization behind the site is trustworthy. Phishing sites can and do use valid HTTPS certificates.

Why are SSL certificate validity periods getting shorter?

Shorter lifespans limit how long a compromised or misissued certificate can be exploited before it naturally expires, and they force more frequent revalidation of domain control. The CA/Browser Forum’s Ballot SC-081v3, approved in April 2025 with unanimous support from Apple, Google, Mozilla, and Microsoft, sets the phased reduction from 398 to 47 days by March 2029.

Can I check an SSL certificate without visiting the site in a browser?

Yes. Command-line tools such as OpenSSL, or free tools like Encryption Consulting’s CSR Generator and OpenSSL CSR & Certificate Decoder, can pull and decode a certificate’s validity window, issuer, and SANs without opening a browser. This is the approach most monitoring tools and CLM platforms use to check certificates at scale.

What causes most certificate-related outages?

Forgotten or undiscovered certificates are the most common root cause, not the renewal step itself. If a certificate isn’t in your inventory, no calendar reminder or renewal workflow will catch it before it expires. That’s why CLM tools lead with automated discovery before automating renewal.

How often should I check my certificate’s validity?

For a handful of sites, a monthly manual check is reasonable today, but that cadence won’t hold up once your certificates renew every 47 days. Organizations managing more than a few certificates should move to continuous, automated monitoring rather than a periodic manual check.