Let's Encrypt

Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). Read all about our nonprofit work this year in our 2023 Annual Report.

A nonprofit Certificate Authority providing TLS certificates to 363 million websites.

Read all about our nonprofit work this year in our 2023 Annual Report.
From our blog
More Memory Safety for Let’s Encrypt: Deploying ntpd-rs
Let’s Encrypt Continues Partnership with Princeton to Bolster Internet Security
Takeaways from Tailscale’s Adoption of ARI
An Engineer’s Guide to Integrating ARI into Existing ACME Clients
Deploying Let's Encrypt's New Issuance Chains
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