Encryption for
Everybody
A nonprofit providing free TLS certificates to more than 600M600M websites.
Explore our work to improve security and privacy
Our 2024 Annual Report highlights the progress we've made toward a better Internet.
From our blog
Ending TLS Client Authentication Certificate Support in 2026
Let’s Encrypt will no longer include the “TLS Client Authentication” Extended Key Usage (EKU) in our certificates beginning in 2026. Most users who use Let’s Encrypt to secure websites won’t be affected and won’t need to take any action.
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How Pebble Supports ACME Client Developers
Our tiny ACME implementation is great for testing and debugging.
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Ten Years of Let's Encrypt: Announcing support from Jeff Atwood
Seeking to inspire our community of supporters, Jeff Atwood commits $1M to support Let’s Encrypt.
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Free, Automated TLS Certificates
Getting started
Let's Encrypt is a Certificate Authority that provides free TLS certificates, making it easy for websites to enable HTTPS encryption and create a more secure Internet for everyone. Let's Encrypt is a project of the nonprofit Internet Security Research Group.
Start securing your websites with free SSL/TLS certificates from Let's Encrypt. In order to get a certificate for your website's domain, you have to demonstrate control over the domain.
Let's Get Started →Global impact made possible by generosity
Support Encryption for Everybody
Your donation helps keep Let's Encrypt free and accessible to millions of websites around the world. Join us in securing the Internet, one site at a time. Every contribution makes a difference, whether you're an individual or a company.
Leading Through Sponsorship
Companies who rely on or value our work to encrypt the Web can financially support Let's Encrypt. Join companies big and small to make this work possible!
More ways we're improving security and privacy
Did you know Let's Encrypt has two sibling projects? Let's Encrypt and these two projects are operated by Internet Security Research Group (ISRG), a 501(c)(3) public benefit organization focused on making the Internet more secure and privacy respecting.
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