Automatic Certificates and HTTPS for everyone.
# Lego
[ACME](https://www.rfc-editor.org/rfc/rfc8555.html) client and library for Let's Encrypt and other ACME CAs written in Go.
[](https://pkg.go.dev/github.com/go-acme/lego/v5)
[](https://github.com//go-acme/lego/actions)
[](https://hub.docker.com/r/goacme/lego/)
lego is an independent, free, and open-source project, if you value it, consider [supporting it](https://donate.ldez.dev)! ❤️
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](https://donate.ldez.dev).
## Features
- ACME v2 [RFC 8555](https://www.rfc-editor.org/rfc/rfc8555.html)
- Support [RFC 8737](https://www.rfc-editor.org/rfc/rfc8737.html): TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
- Support [RFC 8738](https://www.rfc-editor.org/rfc/rfc8738.html): certificates for IP addresses
- Support [RFC 9773](https://www.rfc-editor.org/rfc/rfc9773.html): Renewal Information (ARI) Extension
- Support [draft-ietf-acme-profiles-00](https://datatracker.ietf.org/doc/draft-ietf-acme-profiles/): Profiles Extension
- Support [draft-ietf-acme-dns-persist-01](https://datatracker.ietf.org/doc/draft-ietf-acme-dns-persist/): Challenge for Persistent DNS TXT Record Validation
- Comes with more than [200 DNS providers](https://go-acme.github.io/lego/dns)
- 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](https://letsencrypt.org/2019/10/09/onboarding-your-customers-with-lets-encrypt-and-acme.html) by default
- [Custom challenge solvers](https://go-acme.github.io/lego/usage/library/writing-a-challenge-solver/)
- Certificate bundling
- OCSP helper function
## Installation
How to [install](https://go-acme.github.io/lego/install/).
## Usage
- as a [CLI](https://go-acme.github.io/lego/obtain)
- as a [library](https://go-acme.github.io/lego/library)
## Documentation
Documentation is hosted live at https://go-acme.github.io/lego/.
## DNS providers
Detailed documentation is available [here](https://go-acme.github.io/lego/dns).
If your DNS provider is not supported, please open an [issue](https://github.com/go-acme/lego/issues/new?assignees=&labels=enhancement%2C+new-provider&template=new_dns_provider.yml).