DigiCert

DigiCert is a certificate authority that has expanded into a digital trust platform spanning SSL/TLS, code signing, email authentication, document signing, and DNS security. Where other certificate authorities concentrate on issuance, the DigiCert ONE platform manages the full certificate lifecycle automatically, which matters as TLS certificate lifetimes officially reduce to 47 days under Apple's mandate.

The company is based in Lehi, Utah, with around 1,200 employees across 16 offices, and positions itself as "the most-trusted global provider of high-assurance TLS/SSL, PKI, IoT and signing solutions."

Licensing runs on a 12-month subscription model rather than per-certificate sales. Customers buy licenses for the assets they need to protect (domains, email addresses, code signing operations), then issue unlimited certificates against those assets. Domains and email addresses can be swapped at no extra cost if business needs change.

Two acquisitions extended the platform past certificates. In September 2024 DigiCert acquired Vercara, adding cloud-based DNS services including UltraDNS and DNS Made Easy. Months later it announced the acquisition of Valimail, a leader in zero trust email authentication.

The Vercara deal put DigiCert into authoritative DNS for 0.34% of domains in the DNS Checker dataset, under the UltraDNS Neustar, DNS Made Easy, and Constellix brands. That footprint supplies visibility into domain infrastructure and a basis for selling DNS and certificate services together.

Trust Lifecycle Manager, Software Trust Manager, and Document Trust Manager handle certificate operations at a scale manual processes cannot reach. The DigiCert Trust Assistant enrolls and renews certificates automatically through identity provider integration.

DigiCert also pioneered Verified Mark Certificates (VMCs), which let brands display their logos directly in Gmail inboxes, making digital identity visible at scale rather than only encrypting traffic. Customers range from government agencies and financial institutions to enterprises running large IoT deployments.