Lets Encrypt

Free and automated SSL/TLS certificate authority to secure websites with HTTPS

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Rankings

#7Security & Privacy

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Added 12 Jun 2026

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Rankings

#7Security & Privacy

Overview

Let's Encrypt is a free, open-source, and automated certificate authority that issues SSL/TLS certificates to secure websites. The organization was founded in 2014 by Internet Security Research Group (ISRG) as a non-profit public benefit corporation.

Key Features/Achievements

Issues free SSL/TLS certificates via the ACME protocol

The use of Let's Encrypt has increased dramatically since its inception, with over 200 million registered domains using their services as of 2022. This represents a significant increase in HTTPS adoption across the web.

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Sources

Wikipedia

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