Pattern Builder is a development plugin for theme authors and designers. It extends the native site editor, enabling the creation and modification of reusable block patterns that are saved as part of a theme's files, not just the site database.

Edit theme patterns: Modify any existing pattern, including those shipped with a theme, directly within the visual editor interface. Convert pattern types: Change a pattern from a user pattern (database) to a theme pattern (file) and manage its sync status. Localize content: Automatically generate PHP code to make text in patterns ready for translation and international distribution. Package assets: Optionally import images used in patterns into the theme's asset folder for clean distribution. Manage associations: Tie patterns to specific block types, post types, or templates to control where they appear.