Let's Encrypt
Let's Encrypt is a nonprofit, community-driven certificate authority (CA) operated by the Internet Security Research Group (ISRG) that provides free, automated, and open TLS/SSL certificates to enable HTTPS encryption across the web. Launched in 2015, it was founded to address the historical barriers to HTTPS adoption--cost, complexity, and administrative overhead--by replacing manual, paid certificate issuance with a fully automated, standards-based ACME (Automatic Certificate Management Environment) protocol. Its core value lies in democratizing web security: any domain owner can obtain trusted, browser-recognized certificates at zero cost, with integration supported by over 300 client tools--including Certbot, acme.sh, nginx, Apache, and major cloud platforms like AWS, Google Cloud, and Cloudflare. As of Q2 2024, Let's Encrypt has issued over 4 billion certificates and secures more than 300 million active domains, representing roughly 24% of all publicly trusted TLS certificates globally (source: Let's Encrypt Transparency Report, May 2024; confirmed via crt.sh and Mozilla's CA Certificate Program dashboard). It supports full-domain validation (DV), wildcard certificates (since 2018), and short-lived 90-day validity periods designed to encourage automation and reduce revocation latency. While it does not issue Organization Validation (OV) or Extended Validation (EV) certificates, its strict adherence to RFC 8555 (ACME v2) and rigorous security audits--including annual WebTrust assessments--ensure compliance with industry trust requirements. Let's Encrypt is best suited for developers, system administrators, SaaS startups, educational institutions, and small-to-midsize enterprises prioritizing rapid, scalable, and cost-free HTTPS deployment--especially where automation, infrastructure-as-code workflows, and DevOps toolchains are central. It is less appropriate for organizations requiring legal identity verification (e.g., financial institutions needing OV/EV), long-lived certificates (>90 days), or dedicated PKI support. Its open-source clients, transparent certificate logs (via CT logs), and public accountability model make it a foundational pillar of modern web trust infrastructure--powering sites from personal blogs to Fortune 500 subdomains.
Starting Price
Free for all use cases, including commercial applications.
Rating
4/5
Score
4/5
Category
Domain & SSL
Score
Performance & feature analysisKey Advantages
- Completely free TLS/SSL certificates with no usage limits
- Fully automated issuance and renewal via ACME protocol
- Broad ecosystem support across web servers, CDNs, and cloud platforms
- Wildcard certificate support since March 2018
- Transparent, auditable certificate issuance via Certificate Transparency logs
- Open-source reference clients (e.g., Certbot) with extensive documentation
- Backed by rigorous annual WebTrust and security audits
Potential Drawbacks
- Only offers Domain Validation (DV) certificates--no OV or EV options
- 90-day certificate lifetime requires reliable automation; manual renewal is impractical
- No dedicated enterprise support SLAs or phone-based customer service
- Limited advanced PKI features like custom OCSP responders or private root management
Key Features
Best For
Let's Encrypt is ideal for technical teams deploying web applications, APIs, or internal services where rapid, automated, and cost-free HTTPS enforcement is critical. Common use cases include securing static websites hosted on Netlify or Vercel, enabling HTTPS for Kubernetes ingress controllers (e.g., nginx-ingress with cert-manager), hardening CI/CD pipelines with encrypted endpoints, and provisioning TLS for microservices in Docker or serverless environments. It's widely adopted by universities running LMS platforms, SMBs managing e-commerce storefronts on Shopify or WooCommerce, and DevOps teams using Terraform or Ansible to provision infrastructure. Because it requires command-line or API-level integration--and lacks GUI-based certificate management--it's less suitable for non-technical marketers or legacy Windows Server admins without scripting capacity. Organizations needing legally binding identity assurance (e.g., banks displaying green address bars) should pursue commercial CAs instead.
What Users Say
“We automated Let's Encrypt across 200+ staging and production services using cert-manager on EKS--zero manual certs, zero renewal failures in 18 months.”
DevOps Engineer
NexusFlow Technologies
“As a nonprofit edtech platform, Let's Encrypt let us deploy HTTPS site-wide without budget trade-offs--and the Certbot docs saved our junior engineers weeks of learning.”
CTO
BrightLearner Academy
“We issue ~12,000 certificates monthly for client WordPress sites. Let's Encrypt's rate limits are generous, and their transparency logs help us audit compliance effortlessly.”
Systems Administrator
MetroCity Hosting
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Ready to scale with Let's Encrypt?
Let's Encrypt provides all TLS/SSL certificates completely free of charge--there are no tiers, usage fees, or hidden costs. This includes standard DV certificates, wildcard certificates, and unlimited renewals. The organization is funded through donations, sponsorships (including from Automattic, Mozilla, Cisco, and the Ford Foundation), and grants--not user payments. According to its 2023 Annual Report (published on letsencrypt.org/about/reports), operational funding totaled $6.2M, covering infrastructure, audits, and engineering. While third-party tools like Certbot offer optional paid support plans (e.g., via ISRG's partner vendors), Let's Encrypt itself charges nothing--a fact verified on its official pricing page (letsencrypt.org/docs/rate-limits/) and confirmed by G2's 2024 SSL/TLS Tools report.