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Free, automated Certificate Authority by ISRG. Explore nonprofit work in the 2025 Annual Report.

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Let's Encrypt

Let's Encrypt is a free, automated, and open Certificate Authority brought to you by the nonprofit <a href="https://www.abetterinternet.org/">Internet Security Research Group (ISRG)</a>. Read all about our nonprofit work this year in our <a href="https://www.abetterinternet.org/annual-reports/">2025 Annual Report</a>.
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How Pebble Supports ACME Client Developers

How Pebble Supports ACME Client Developers

Wed, 30 Apr 2025 00:00:00 +0000
Milestone: 100 Million Certificates Issued

Milestone: 100 Million Certificates Issued

Wed, 28 Jun 2017 00:00:00 +0000
ISRG’s 10th Anniversary

ISRG’s 10th Anniversary

Wed, 24 May 2023 00:00:00 +0000
Progress Towards 100% HTTPS, June 2016

Progress Towards 100% HTTPS, June 2016

Wed, 22 Jun 2016 00:00:00 +0000
Ending Support for Expiration Notification Emails

Ending Support for Expiration Notification Emails

Wed, 22 Jan 2025 00:00:00 +0000
Sustaining a More Secure Internet: The Power of Recurring Donations

Sustaining a More Secure Internet: The Power of Recurring Donations

Wed, 21 May 2025 00:00:00 +0000
How Let's Encrypt Runs CT Logs

How Let's Encrypt Runs CT Logs

Wed, 20 Nov 2019 00:00:00 +0000
Multi-Perspective Validation Improves Domain Validation Security

Multi-Perspective Validation Improves Domain Validation Security

Wed, 19 Feb 2020 00:00:00 +0000
DNS-PERSIST-01: A New Model for DNS-based Challenge Validation

DNS-PERSIST-01: A New Model for DNS-based Challenge Validation

Wed, 18 Feb 2026 00:00:00 +0000
Introducing Oak, a Free and Open Certificate Transparency Log

Introducing Oak, a Free and Open Certificate Transparency Log

Wed, 15 May 2019 00:00:00 +0000
Ending TLS Client Authentication Certificate Support in 2026

Ending TLS Client Authentication Certificate Support in 2026

Wed, 14 May 2025 00:00:00 +0000
ACME v2 API Endpoint Coming January 2018

ACME v2 API Endpoint Coming January 2018

Wed, 14 Jun 2017 00:00:00 +0000
Our role in supporting the nonprofit ecosystem

Our role in supporting the nonprofit ecosystem

Wed, 13 Dec 2023 00:00:00 +0000
Let’s Encrypt Receives the Levchin Prize for Real-World Cryptography

Let’s Encrypt Receives the Levchin Prize for Real-World Cryptography

Wed, 13 Apr 2022 00:00:00 +0000
Six-Day and IP Address Certificates Available in Certbot

Six-Day and IP Address Certificates Available in Certbot

Wed, 11 Mar 2026 00:00:00 +0000
Reflections on a Year of Sunlight

Reflections on a Year of Sunlight

Wed, 11 Jun 2025 00:00:00 +0000
A Note from our Executive Director

A Note from our Executive Director

Wed, 11 Dec 2024 00:00:00 +0000
Preparing to Issue 200 Million Certificates in 24 Hours

Preparing to Issue 200 Million Certificates in 24 Hours

Wed, 10 Feb 2021 00:00:00 +0000
Onboarding Your Customers with Let's Encrypt and ACME

Onboarding Your Customers with Let's Encrypt and ACME

Wed, 09 Oct 2019 00:00:00 +0000
New Name, New Home for the Let's Encrypt Client Software

New Name, New Home for the Let's Encrypt Client Software

Wed, 09 Mar 2016 00:00:00 +0000