Automatic Certificates and HTTPS for everyone.

Lego

ACME client and library for Let's Encrypt and other ACME CAs written in Go.

lego is an independent, free, and open-source project, if you value it, consider supporting it! ❤️

Everybody thinks that the others will donate, but in the end, nobody does.

So if you think that lego is worth it, please consider donating.

Features

• ACME v2 RFC 8555
• Support RFC 8737: TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
• Support RFC 8738: certificates for IP addresses
• Support RFC 9773: Renewal Information (ARI) Extension
• Support draft-ietf-acme-profiles-00: Profiles Extension
• Support draft-ietf-acme-dns-persist-01: Challenge for Persistent DNS TXT Record Validation
• Comes with more than 200 DNS providers
• Register with CA
• Obtain certificates, both from scratch or with an existing CSR
• Renew certificates
• Revoke certificates
• Robust implementation of ACME challenges:
• HTTP (http-01)
• DNS (dns-01)
• TLS (tls-alpn-01)
• SAN certificate support
• CNAME support by default
• Custom challenge solvers
• Certificate bundling
• OCSP helper function

Installation

How to install.

Usage

• as a CLI
• as a library

Documentation

Documentation is hosted live at https://go-acme.github.io/lego/.

DNS providers

Detailed documentation is available here.

If your DNS provider is not supported, please open an issue.

If your DNS provider is not supported, please open an issue.