How to Install an SSL Certificate

DigiCert Customer Reviews: ★★★★★ 4.9 (1595)

An SSL Certificate is a text file with encrypted data that you install on your server so that you can secure/encrypt sensitive communications between your site and your customers.

After you create a CSR (certificate signing request) and purchase a certificate, our Validation team validates and processes your certificate request. Once validated, we issue your SSL Certificate and send it to you via email. You can also download your SSL Certificate in your DigiCert account.

After you’ve installed your SSL Certificate, we recommend that you make a backup copy of the certificate and store it in a secure place. If a server crashes or needs to be replaced, it is much easier to secure the replacement server.

When downloading your SSL Certificate from your account, you will need to download an intermediate certificate. Browsers require the intermediate certificate to complete the certificate trust chain. The intermediate certificate links your SSL Certificate to DigiCert’s root certificate. Registered Certificate Authorities such as DigiCert must provide a known root certificate before their SSL Certificate can be trusted by SSL-enabled applications (learn more about the role of intermediate and root certificates). Note that for some servers (such as Microsoft) the intermediate certificates are bundled with the SSL Certificate.

Once you have your certificate installed, we recommend that you check that everything is working correctly using our free SSL Installation Diagnostics Tool. Alternatively, for an easy way to find and manage all the certificates on your network, try our free DigiCert Certificate Inspector tool.

Common Platforms & Operating Systems

NOTE: To remain secure, certificates must use keys which are at least 2048 bits in length. If your server platform can't generate a CSR with a 2048-bit key, please contact us. See this article for more information.

Get The Support You Need, When You Need It

DigiCert has an award-winning in-house technical support team that is here to help you with any digital certificate issues that you have. Our dedication to unparalleled customer support is reflected in the numerous service awards we have won. Nowhere is this better demonstrated than in the hundreds of 5-star customer reviews we have on In fact, DigiCert is the only Certificate Authority with a perfect 5-star rating!

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We try to keep our online documentation as up-to-date as possible. However, if you have a particular article or platform that you would like to see documentation for, please email us.

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The support person I spoke with helped me with the entire process and it couldn't have been easier. They were knowledgeable on the product and even talked to me about future upgrades that will need to be done with in our company.

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Best Support Out There

We were required to make a change to our current Digicert certificate as .local domain names will no longer be supported. We made the change to the cert and Digicert customer support were with us all the way. I have never experienced such great customer service and support from any company issuing certificates. I would not waste time with any other vendor if you require great support and no hassle service at best cost.
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Best certificates

I am a Windows infrastructure architect that does large-scale email migrations and other complex IT infrastructure projects. Proper levels of security is essential for all of these projects. Certificates are key to that. I have worked with many different certificate authorities, and I would always prefer to work with DigiCert. Their system allows you to get past technical issues by reissuing the same certificate without revoking previously issued certs. Further, DigiCert is flexible with domain name validation procedures. For domains with Secret Registration, email-based domain name validation will not work. Instead DigiCert allows for DNS record-based domain name validation.