Let's Encrypt

What it does

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 Encrypt2019 · letsencrypt.org · ▲11

  Free SSL/TLS certificates.

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  Encryps2017 · ▲7

  Encrypt unlimited bits.

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  Encrypto2015 · macpaw.com · ▲141

  Encrypt the files you send.

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  DocSecrets2015 · docsecrets.net · ▲85

  Encrypt your Google Docs

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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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  Cryptocat2014 · ▲61

  In-browser encrypted chat (open source)

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  Life & fun · 8d ago · permit.petercai.com

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  Life & fun · 21d ago · bigwords.page

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  A PHP security challenge. Find the hidden bitcoin key. First person to get the wallet wins.

  Life & fun · 3d ago · stealmybitcoin.com

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  Life & fun · 14d ago · guitoro.com

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  Life & fun · 2015 · periscope.tv

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  The best new products, every day, in your browser

  Life & fun · 2015

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  Place it. Press it. Get it.

  Commerce · 2015 · amazon.com

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  Get paid via $cashtags for things you do online or in person

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