Digicert

Digicert is a public key infrastructure (PKI) and digital certificate provider. It sells SSL/TLS certificates that encrypt data between a web server and a browser, helping websites display the padlock icon and run over HTTPS. Beyond SSL, Digicert offers code signing certificates so developers can sign their software, proving it hasn't been tampered with before users install it. The company also provides document signing certificates for adding legally valid digital signatures to PDFs and other files.

Digicert stands out for its broad range of validation levels — from basic Domain Validation (DV) that only checks domain ownership to Extended Validation (EV) that requires a thorough vetting of the organization. It includes lifecycle management tools that help IT teams deploy, renew, and revoke certificates at scale, especially useful in enterprise environments with many servers. The company offers an API and integrations with popular platforms like AWS, Azure, and NGINX for automated certificate issuance and installation.

The main audience for Digicert is businesses and organizations that need strong encryption and trust signals for their websites and software. E-commerce sites rely on it to protect customer payment data. Software companies use code signing to assure users their downloads are safe. Legal teams and HR departments use document signing to close contracts without printing or scanning. For anyone who needs to prove identity and secure communications online, Digicert provides the underlying certificates that make that trust work.