4 Ways to Check SSL Certificate Expiration date

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SSL/TLS certificates verify and validate the identity of the certificate holder or applicant before authenticating it. We will share 4 ways to check the SSL Certificate Expiration date.

what is SSL certificate?

SSL certificates are used to establish secure connections between web browsers and websites. When you visit a website that uses SSL, the website will send its SSL certificate to your browser. Your browser will then use the certificate to verify the website’s identity. If the website’s identity is verified, your browser will create a secure connection with the website. SSL certificates are typically used to protect sensitive information, such as credit card numbers and passwords.

how to choose an SSL certificate

When choosing an SSL certificate, it is important to consider the type of encryption that is used. RSA is more widely used, but ECDSA is becoming increasingly popular due to its security features.

Another important factor to consider is the length of the certificate’s signature. The longer the signature, the more secure the connection will be. However, longer signatures can also lead to slower performance.

Finally, you should also consider the price of the SSL certificate. In most cases, you can find a good SSL certificate for a reasonable price.  comodosslstore is a great choice to get an SSL certificate. Comodo is a world-class Certificate Authority with a long history innovation within the Certificate Authority space.

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what will happen after SSL certificate expires?

If an SSL certificate expires, the website will not be able to establish a secure connection with browsers. This can cause visitors to see security warnings and potentially leave the website. It is important to renew SSL certificates before they expire in order to avoid these problems.

check SSL certificate expiration date from a certificate file

Openssl command is a very powerful command to check certificate info in Linux. We can use the following command to check the expiration date.

openssl x509 -enddate -noout -in file.cer
Example: openssl x509 -enddate -noout -in hydssl.cer
notAfter=Dec 12 16:56:15 2029 GMT


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check SSL certificate expiration date from a server URL

openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -dates

openssl s_client -servername -connect 2>/dev/null | openssl x509 -noout -dates
notBefore=Aug 16 01:37:02 2021 GMT
notAfter=Nov 8 01:37:01 2021 GMT

The openssl is a very useful diagnostic tool for TLS and SSL servers. The openssl command-line options are as follows:

  • s_client : The s_client command implements a generic SSL/TLS client which connects to a remote host using SSL/TLS.
  • -servername $DOM : Set the TLS SNI (Server Name Indication) extension in the ClientHello message to the given value.
  • -connect $DOM:$PORT : This specifies the host ($DOM) and optional port ($PORT) to connect to.
  • x509 : Run certificate display and signing utility.
  • -noout : Prevents output of the encoded version of the certificate.
  • -dates : Prints out the start and expiry dates of a TLS or SSL certificate.


check SSL certificate expiration date from online Certificate Decoder

The SSL Certificate Decoder tool instantly decodes any SSL Certificate-no matter what format: PEM, DER, or PFX encoded SSL Certificates. It works quickly and accurately to strip all the information from our certificate and present it in an easy-to-understand way. To use the certificate decoder tool, go to ssl tool area on the right side of page select Certificate Decoder Tool, paste our certificate into the field and let the certificate decoder do the rest.


  • Common Name : HydrantID Server CA O1
  • Organization : IdenTrust
  • Organization Unit : HydrantID Trusted Certificate Service
  • Country : US
  • Valid From : Dec 12,2019
  • Valid To : Dec 12,2029
  • Issuer : IdenTrust
  • Serial Number : 85078034981552318268408137974808230776


check SSL certificate expiration date from online tool

There are many online tools to check the SSL certificate info. Go to ssl tool area on the right side of page In SSL Checker Tool, we can input the domain name to check it. All the info in the certificate will be displayed including the expiration date. This will also display the expiration date for all the intermediate certificates.


  • The certificate expires November 6, 2021 (70 days from today)
  • Subject Valid from 08/Aug/2021 to 06/Nov/2021
  • Subject R3 Valid from 04/Sep/2020 to 15/Sep/2025
  • Subject ISRG Root X1Valid from 20/Jan/2021 to 30/Sep/2024


how to renew an SSL certificate

The process for renewing an SSL certificate is usually pretty simple. First, you will need to generate a new CSR (Certificate Signing Request). You can do this using a tool like OpenSSL. Once you have generated the CSR, you will need to submit it to your CA (Certificate Authority).

Once the CA has issued your new certificate, you will need to install it on your web server. In most cases, this is a fairly simple process. However, if you are not familiar with this, you may want to ask help from here

Once the new certificate is installed, you should be all set! Your website will now be able to establish secure connections with browsers.



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