What Is Let's Encrypt?
Let's Encrypt is a free, automated, and open Certificate Authority launched in 2016 by the Internet Security Research Group (ISRG). Its mission is simple: make HTTPS the default for the entire web by removing the cost and complexity barriers associated with obtaining SSL/TLS certificates.
Let's Encrypt has issued billions of certificates and is trusted by all major browsers and operating systems. For the majority of websites, it is a completely adequate — and genuinely excellent — solution.
How Let's Encrypt Works
Let's Encrypt uses the ACME protocol (Automatic Certificate Management Environment) to automate the entire certificate lifecycle: issuance, renewal, and revocation. Here's the process:
- An ACME client (such as Certbot) runs on your server and requests a certificate for your domain.
- Let's Encrypt sends a challenge — typically a file to place on your server (HTTP-01) or a DNS record to create (DNS-01) — to verify you control the domain.
- Once the challenge is completed, the certificate is issued automatically.
- The ACME client can be scheduled to renew the certificate automatically before it expires.
Let's Encrypt certificates are valid for 90 days — shorter than commercial certificates — but the automation makes this a non-issue in practice. Certbot and similar tools handle renewal seamlessly.
Let's Encrypt vs. Paid Certificates: Key Differences
| Feature | Let's Encrypt | Paid CA Certificates |
|---|---|---|
| Cost | Free | Varies (tens to hundreds per year) |
| Validation Type | Domain Validation (DV) only | DV, OV, and EV available |
| Wildcard Certificates | Yes (via DNS-01 challenge) | Yes |
| Validity Period | 90 days (auto-renewable) | 1–2 years |
| Business Identity Verification | No | Yes (OV/EV) |
| Warranty | None | Varies by provider |
| Support | Community forums | Dedicated support |
When Let's Encrypt Is the Right Choice
Let's Encrypt is ideal for:
- Personal blogs and portfolio sites
- Small business websites that don't process payments directly
- Development and staging environments
- Open-source projects and community sites
- Any scenario where Domain Validation is sufficient
When You Might Need a Paid Certificate
Consider a paid certificate when:
- You need OV or EV validation to display organizational identity in security tools (EV no longer shows a green bar in browsers as of 2019, but is still valued in enterprise contexts).
- Your organization requires a certificate with a financial warranty for compliance or insurance purposes.
- You need dedicated commercial support for certificate management.
- Your hosting environment doesn't support automated ACME renewal and manual 90-day renewals would be burdensome.
Getting Started with Let's Encrypt
The easiest path depends on your hosting setup:
- Shared hosting — Most major hosts (cPanel, SiteGround, DreamHost) have built-in Let's Encrypt integration in their dashboards. Look for an "AutoSSL" or "Let's Encrypt" option.
- VPS or dedicated server — Install Certbot (the official ACME client) from certbot.eff.org. It has step-by-step instructions for Apache and Nginx.
- Cloudflare — Cloudflare provides free TLS termination at its edge, effectively giving you HTTPS without touching your origin server's certificate configuration.
The Bottom Line
Let's Encrypt has fundamentally changed the SSL/TLS landscape. For the vast majority of websites, there is no longer a reason to pay for basic HTTPS. Invest the time to set up automated renewal correctly, and you'll have robust, modern encryption at zero cost — freeing your budget for other security priorities.