# Lets Encrypt Isrg

> Publicly sourced profile assembled by Optimly, in the Optimly AI Brand Index. Last refreshed 2026-10-04.

- **Business Profile:** https://optimly.ai/brand/lets-encrypt-isrg
- **Dataset:** https://optimly.ai/brand/lets-encrypt-isrg.json
- **Markdown:** https://optimly.ai/brand/lets-encrypt-isrg/llms.txt
- **Official website:** https://letsencrypt.org
- **Slug:** lets-encrypt-isrg
- **Categories:** cybersecurity

## Overview

- **Tagline:** Provides widely recognized and trusted SSL/TLS certificates, with a focus on enabling secure web communication and addressing certificate chain compatibility challenges for a broad range of client types.
Source: Brand's website (https://letsencrypt.org) · 2026-10-04

- **Description:** Let's Encrypt (operated by ISRG) is a Certificate Authority providing SSL/TLS certificates for websites and servers. The context discusses how to obtain specific certificate chains and manage compatibility issues with various clients and root certificates.
Source: Brand's website (https://letsencrypt.org) · 2026-10-04

## Offerings

- **Core capabilities:**
  - SSL/TLS certificates
  - management of certificate chains (e.g.
  - ISRG Root X1
  - DST Root CA X3)
Source: Brand's website (https://letsencrypt.org) · 2026-10-04

- **Pricing:** Not specified in the provided context.
Source: Brand's website (https://letsencrypt.org) · 2026-10-04

## Audience

- **Target industry:** Website owners, server administrators, developers, and organizations seeking to secure web traffic and ensure compatibility with various client environments (e.g., OpenSSL, Android, wolfSSL).
Source: Brand's website (https://letsencrypt.org) · 2026-10-04

Page last updated 2026-10-17.