Serve websites with Caddy, an HTTP server that supports automatic HTTPS.

github.com/caddyserver/caddy
Caddy homepage screenshot

About Caddy

Caddy is a web server written in Go. It serves sites over HTTP/1.1, HTTP/2 and HTTP/3, and TLS is on by default. For public names it can obtain certificates from Let's Encrypt and ZeroSSL. It can also run a local certificate authority for internal names and IP addresses. You can configure it with a Caddyfile, native JSON or a JSON API for dynamic changes. The source code is under the Apache-2.0 license. You can install it by downloading an executable from GitHub Releases, or build it from source with Go 1.26.0 or newer.

Pricing is not clearly stated.

Key features

  • Automatic HTTPS by default
  • Certificates from Let's Encrypt and ZeroSSL for public names
  • Local certificate authority for internal names and IP addresses
  • Caddyfile, native JSON config and JSON API
  • Config adapters for other formats
  • HTTP/1.1, HTTP/2 and HTTP/3 by default
  • Modular architecture for extending the server
  • No external dependencies
Watch out for
  • Binding to low ports may require elevated privileges
  • Building from source requires Go 1.26.0 or newer

Caddy at a glance

Type
App
Pricing
Not confirmed. Check the site
Platforms
Windows, macOS, Linux
Details verified
Oct 22, 2026 · Official source
Open source
Yes · Source code
Language
English
Last checked
Oct 5, 2026 · Online when checked
Listed
Oct 5, 2026

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Caddy FAQ

Do I need Go installed to run Caddy?
No. You can download the executable from GitHub Releases. Go 1.26.0 or newer is needed when you build from source.
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