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How To Check SSL Certificate Expiration with OpenSSL

February 19, 2022

Check the expiration date of the SSL certificate using OpenSSL
Home » Article » How To Check SSL Certificate Expiration with OpenSSL

Quoted from Wikipedia: OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end. It is widely used by Internet servers, including the majority of HTTPS websites.

If you have an SSL file in your server, don’t know how to see it will expire? No need to use a third party website to check your SSL expiration

You can use OpenSSL for all kinds of purposes around SSL Certificates, such as how to create your own certificate, private key, csr, and see your SSL expiration.

Check SSL certificate expiration date from OpenSSL

1. Open command prompt, then go to OpenSSL bin directory. If you don’t have it, install it first (Download)

cmd-bin-openssl

Set directory to /bin, for example: my openssl bin directory is in “C:\Program Files\OpenSSL-Win64\bin” Then enter the command “cd C:\Program Files\OpenSSL-Win64\bin”

2. Prepare your SSL certificate file in bin directory (certificate.crt), it is needed to see the expiry date using the Command

Enter the following command to see the expiry date of your certificate

openssl x509 -in certificate.crt -text -noout

cms-command-check-validity-openssl

Now we know when the ssl certificate will be expired

Check SSL certificate expiration date without OpenSSL

Actually there is another way to see the expiry of your ssl certificate, that is by opening the crt file itself … Here we go!

1. Go to your SSL certificate directory
dir-crt-ssl
2. Double-click on your SSL Certificate file, it will look like below
certificate-window

You will see in the valid from section, that is your SSL certificate expiration.

But in order to get more valid information, it’s better to use Open-SSL Command, it’s not that hard to do it, right?

Video Tutorial How to Check SSL Certificate Expiration with OpenSSL

Conclution

The above steps are very important to see the quality of your SSL certificate, because we need to know when to replace it with a new certificate.

I hope this gave you an idea of how to view certificate expiry date with Open-SSL.

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