Types of SSL Certificates

Understanding Different SSL Certificate Types

SSL/TLS certificates come in different types based on validation level and the number of domains they cover. Choosing the right type depends on your website's needs, security requirements, and budget.

Validation Levels

Domain Validation (DV) Certificates

The most basic type of SSL certificate, verifying only that the applicant controls the domain.

• Validation: Domain ownership only (via email, DNS, or HTTP)
• Issuance Time: Minutes to hours
• Cost: Free (Let's Encrypt) to low cost
• Browser Display: Padlock icon only
• Best For: Blogs, personal websites, small sites

Organization Validation (OV) Certificates

Provides moderate assurance by verifying the organization behind the domain.

• Validation: Domain ownership + organization identity verification
• Issuance Time: 1–3 business days
• Cost: Moderate ($50–$200/year)
• Browser Display: Padlock icon, organization details in certificate
• Best For: Business websites, public-facing organizations

Extended Validation (EV) Certificates

The highest level of assurance with rigorous identity verification.

• Validation: Extensive verification of legal, physical, and operational existence
• Issuance Time: 1–2 weeks
• Cost: High ($100–$500+/year)
• Browser Display: Organization name displayed in certificate details
• Best For: E-commerce, banking, high-trust websites

Coverage Types

Single Domain Certificates

Secures exactly one fully qualified domain name (FQDN).

• Covers: www.example.com only
• Most affordable option
• Simple to manage

Wildcard Certificates

Secures a domain and all its first-level subdomains.

• Covers: *.example.com (mail.example.com, shop.example.com, etc.)
• Does NOT cover: sub.sub.example.com
• Cost-effective for multiple subdomains
• Available in DV and OV only

Multi-Domain (SAN) Certificates

Secures multiple different domain names with a single certificate.

• Covers: example.com, example.net, otherdomain.com
• Uses Subject Alternative Names (SAN) extension
• Typically supports 100–250 domains
• Easier management than individual certificates

Multi-Domain Wildcard Certificates

Combines wildcard and multi-domain features.

• Covers: *.example.com, *.otherdomain.com
• Maximum flexibility
• Higher cost but simplifies management

Choosing the Right Certificate