#let

This FAQ is divided into the following sections: General Questions Technical Questions General Questions What services does Let’s Encrypt offer? Let’s Encrypt is a global Certificate Authority (CA). We let people and organizations around the world ob

Internet Security Research Group (ISRG) is the non-profit entity that operates the Let's Encrypt Certificate Authority. Some policies that apply to Let's Encrypt are ISRG policies, some are specific to Let's Encrypt. Let's Encrypt Subscriber Agreemen

Please note that the Let's Encrypt Usage and Let's Encrypt Certificates Issued Per Day charts are undergoing updates and may not reflect the most recent data. Let's Encrypt Usage Percentage of Web Pages Loaded by Firefox Using HTTPS (14-day moving av

Let’s Encrypt issues certificates through an automated API based on the ACME protocol. In order to interact with the Let’s Encrypt API and get a certificate, a piece of software called an “ACME client” is required. No part of the process for getting

Let's Encrypt 是一家免费、开放、自动化的证书颁发机构，由非营利组织互联网安全研究组 (ISRG) 运作。我们这一年来的非营利工作详情可在 2025 年度报告中查阅。