Chứng Chỉ SSL/TLS Certificates Miễn Phí - Let's Encrypt

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Encryption for Everybody

A nonprofit providing free TLS certificates to more than 700M700M websites.

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Explore our work to improve security and privacy

Our 2025 Annual Report highlights the progress we've made toward a better Internet.

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From our blog

December 9, 2025

10 Years of Let's Encrypt Certificates

Let’s Encrypt has been issuing trusted certificates for a decade. Đọc thêm → December 2, 2025

Decreasing Certificate Lifetimes to 45 Days

Improving security for active and revoked certificates. Đọc thêm → November 24, 2025

New "Generation Y" Hierarchy of Root and Intermediate Certificates

Let’s Encrypt is beginning issuance from our new hierarchy of root and intermediate certificates. Đọc thêm → See all our blog posts 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.

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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.

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Learn about our certificate issuance process and best practices.

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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!

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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.