Let's Encrypt

What it does

Let's Encrypt is a free, automated, and open certificate authority brought to you by the non-profit, Internet Security Research Group (ISRG).

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 2025 Annual Report.

Our 2025 Annual Report highlights the progress we've made toward a better Internet. 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. Learn about our certificate issuance process and best practices. Choose from our recommended ACME clients to automatically manage your certificates. Join our community…from letsencrypt.org

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  Let's Encrypt2015 · letsencrypt.org · ▲26

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  Let's Seal – Let's Encrypt for document signing, free and self-hostedJul 2026 · github.com · ▲94

  TLDR, Let's Seal gives the finger to Adobe and every doc signing tool (docusign, google, etc) who pay to play with the Adobe Approved Trust List and then charge you for something that should be free. Currently even the person checking if a document/contract is sealed or code is authentic has to also be inside the same Adobe walled garden too. Verification, the part that should be free is the part everyone charges for. Thats the shape Let's Encrypt fixed for TLS, and I wanted the same thing for documents and files. The core idea therefore needed to go a bit beyond e signatures and i…

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  Anchor Relay – A faster, easier way to get Let's Encrypt certificates2025 · anchor.dev · ▲80

  From the cryptic terminal commands to the innumerable ways to shoot yourself in the foot, I always struggled to use TLS certificates. I love how much easier (and cheaper) Let's Encrypt made it to get certificates, but there are still plenty of things to struggle with. That's why we built Relay: a free, browser-based tool that streamlines the ACME workflow, especially for tricky setups like homelabs. Relay acts as a secure intermediary between your ACME client and public certificate authorities like Let's Encrypt. Some ways Relay provides a better experience: - really fast, streamlined…

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  My LetsEncrypt Managemet Console/API Server (Open-Source)2016 · github.com · ▲15
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