Overview
Cloudflare SSL is a managed certification service operating at the CDN proxy level. Let's Encrypt is an open certificate authority providing free certificates via the ACME protocol for direct installation on the web server.
| Parameter | Cloudflare SSL | Let's Encrypt |
|---|---|---|
| Validation Type | DV (Domain Validation) | DV (Domain Validation) |
| Validity Period | 1 year (managed) | 90 days |
| Termination Point | Cloudflare Edge nodes | Origin server |
| Automation | Full, proxy-side | ACME client (Certbot, etc.) |
| DDoS Protection | Included by default | None |
| IP Masking | Yes (via proxy) | No |
Performance
Cloudflare terminates SSL connections at the edge node closest to the user. This reduces latency by shortening the TCP/TLS Handshake distance. It supports HTTP/3 and 0-RTT TLS 1.3 out of the box. With Let's Encrypt, performance depends on your server configuration (Nginx/Apache) and the user's geographic distance from the data center.
Configuration & complexity
In Cloudflare, setup involves selecting a mode in the dashboard: Flexible, Full, or Strict. It requires no changes to server config files if using Flexible mode. Let's Encrypt requires installing an agent on the server. Deployment example:
certbot --nginx -d example.comManual or automated cron jobs are needed for renewal since certificates expire every 90 days. Misconfigurations in the web server can break automatic renewal processes.
When to choose what
- Cloudflare SSL: for DDoS protection, masking origin IP, and fast content delivery via CDN.
- Let's Encrypt: for internal services, non-proxied APIs, or when security policies forbid traffic decryption on third-party nodes.
Cost / licensing
Both technologies are free in their basic versions. Cloudflare offers paid advanced features: Custom Hostnames (SSL for SaaS) and custom certificate uploads (Business/Enterprise plans). Let's Encrypt is always free, supported by the non-profit ISRG.
Ecosystem & integrations
Cloudflare is integrated with its own WAF, Workers, and analytics. Let's Encrypt is supported by almost all hosting control panels (ISPmanager, cPanel, Plesk) and cloud providers via the ACME standard.
Verdict
Cloudflare is ideal for public websites prioritizing speed and protection. Let's Encrypt is the standard for direct server security management without intermediaries.