Encryption for
Everybody
A nonprofit providing free TLS certificates to more than 650M650M 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
We've Issued Our First IP Address Certificate
Let’s Encrypt now has the ability to issue certificates for both domain names and IP addresses.
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Expiration Notification Service Has Ended
Let’s Encrypt ended its certificate-expiration notification emails on June 4, 2025.
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Reflections on a Year of Sunlight
Our experiment with a new Certificate Transparency architecture has been a success.
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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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