Automatic Certificates and HTTPS for everyone.

Lego

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

Features

ACME v2 RFC 8555
- Support RFC 8737: TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
- Support RFC 8738: certificates for IP addresses
- Support draft-ietf-acme-ari-03: Renewal Information (ARI) Extension
Register with CA
Obtain certificates, both from scratch or with an existing CSR
Renew certificates
Revoke certificates
Robust implementation of all ACME challenges
- HTTP (http-01)
- DNS (dns-01)
- TLS (tls-alpn-01)
SAN certificate support
CNAME support by default
Comes with multiple optional DNS providers
Custom challenge solvers
Certificate bundling
OCSP helper function

How to install.

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

Detailed documentation is available here.

Akamai EdgeDNS	Alibaba Cloud DNS	all-inkl	Amazon Lightsail
Amazon Route 53	ArvanCloud	Aurora DNS	Autodns
Azure (deprecated)	Azure DNS	Bindman	Bluecat
Brandit (deprecated)	Bunny	Checkdomain	Civo
Cloud.ru	CloudDNS	Cloudflare	ClouDNS
CloudXNS (Deprecated)	ConoHa	Constellix	Core-Networks
CPanel/WHM	Derak Cloud	deSEC.io	Designate DNSaaS for Openstack
Digital Ocean	DirectAdmin	DNS Made Easy	dnsHome.de
DNSimple	DNSPod (deprecated)	Domain Offensive (do.de)	Domeneshop
DreamHost	Duck DNS	Dyn	Dynu
EasyDNS	Efficient IP	Epik	Exoscale
External program	freemyip.com	G-Core	Gandi
Gandi Live DNS (v5)	Glesys	Go Daddy	Google Cloud
Google Domains	Hetzner	Hosting.de	Hosttech
HTTP request	http.net	Huawei Cloud	Hurricane Electric DNS
HyperOne	IBM Cloud (SoftLayer)	IIJ DNS Platform Service	Infoblox
Infomaniak	Internet Initiative Japan	Internet.bs	INWX
Ionos	IPv64	iwantmyname	Joker
Joohoi's ACME-DNS	Liara	Lima-City	Linode (v4)
Liquid Web	Loopia	LuaDNS	Mail-in-a-Box
Manual	Metaname	mijn.host	Mittwald
MyDNS.jp	MythicBeasts	Name.com	Namecheap
Namesilo	NearlyFreeSpeech.NET	Netcup	Netlify
Nicmanager	NIFCloud	Njalla	Nodion
NS1	Open Telekom Cloud	Oracle Cloud	OVH
plesk.com	Porkbun	PowerDNS	Rackspace
Rain Yun/雨云	RcodeZero	reg.ru	Regfish
RFC2136	RimuHosting	Sakura Cloud	Scaleway
Selectel	Selectel v2	SelfHost.(de\|eu)	Servercow
Shellrent	Simply.com	Sonic	Stackpath
Technitium	Tencent Cloud DNS	Timeweb Cloud	TransIP
UKFast SafeDNS	Ultradns	Variomedia	VegaDNS
Vercel	Versio.[nl\|eu\|uk]	VinylDNS	VK Cloud
Volcano Engine/火山引擎	Vscale	Vultr	Webnames
Websupport	WEDOS	West.cn/西部数码	Yandex 360
Yandex Cloud	Yandex PDD	Zone.ee	Zonomi

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