A nonprofit Certificate Authority providing TLS certificates to 200 million websites.

Read our 2019 Annual Report (Desktop, Mobile)

From our blog

  • Let's Encrypt Has Issued a Billion Certificates

    We issued our billionth certificate on February 27, 2020. We’re going to use this big round number as an opportunity to reflect on what has changed for us, and for the Internet, leading up to this event.

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  • Multi-Perspective Validation Improves Domain Validation Security

    At Let’s Encrypt we’re always looking for ways to improve the security and integrity of the Web PKI. We’re proud to launch multi-perspective domain validation today because we believe it’s an important step forward for the domain validation process.

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  • How Let's Encrypt Runs CT Logs

    Let’s Encrypt launched a Certificate Transparency (CT) log this past spring. We’re excited to share how we built it in hopes that others can learn from what we did.

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