Lettern documentation
Everything you need to build websites with Lettern, the free, open-source CMS. Start with the basics, or jump straight to what you need.
Start here
Install LetternUpload a zip to any PHP host, or use Composer. A few minutes, start to finish.
Build your first pageWrite, add blocks and publish, right on the page itself.
Make it yoursPick colors, fonts and spacing once. Every page follows.
Work with AIAsk the assistant, or connect Claude, ChatGPT or Cursor to your site.
Browse by topic
Get startedInstall Lettern, take the tour, and learn the few ideas it is built on.EditingWrite and build pages right where they appear, with one editor for everything.DesignColors, fonts, templates and reusable designs: make the site look like yours.ContentYour own kinds of content, plus images, menus and languages.Run your sitePublish, host and look after a live site, its people and its visitors.AI and automationBuild and edit your site with AI: the assistant in the admin, your own AI tools, the API and the command line.PluginsBuild your own features, for one site or for everyone in the store.ReferenceThe details to look up when you need them — files, settings, blocks, field types and abilities.