Full Site Editing (FSE) is no longer an experimental WordPress feature — it’s the present and future of how WordPress sites are built. If you’ve been hesitant to adopt block themes and the Site Editor, 2025 is the year to make the switch. The tooling has matured dramatically, the documentation has improved, and the ecosystem is catching up fast.
This guide walks you through everything: what FSE is, how it works, when to use it, and how to get started.
What Is Full Site Editing?
Full Site Editing (officially called the “Site Editor” in WordPress) extends the block editor beyond post and page content to cover your entire site structure — headers, footers, sidebars, archive pages, 404 pages, and more.
Before FSE, customizing headers and footers required either a page builder (like Elementor or Divi), a theme with a visual customizer, or custom PHP templates. With FSE and block themes, the entire site is built from blocks — no PHP required for visual customization.
WordPress’s approach to FSE is documented thoroughly on the Block Editor Handbook.
The Building Blocks of FSE
Block Themes
FSE requires a block theme — a theme that uses HTML template files instead of PHP. These themes define layouts using block markup and a theme.json file for design tokens (colors, typography, spacing).
Popular block themes include:
- Twenty Twenty-Five — the current default WordPress theme
- Blockbase — a minimal starter theme from Automattic
- Ollie — feature-rich with stunning patterns
Templates
Templates define the layout for specific page types: the home page, single posts, category archives, search results, and more. They live in a /templates/ folder within your theme.
Template Parts
Template parts are reusable chunks — like headers and footers — that get included in templates. They live in the /parts/ folder.
Patterns
Block patterns are pre-designed groups of blocks that can be inserted into any page or template. They range from simple call-to-action sections to complex full-page layouts. Explore the WordPress Pattern Directory for thousands of options.
theme.json
The theme.json file is the heart of a block theme. It defines your design system — color palettes, font sizes, spacing scales, border radii, and more — in a standardized JSON format that WordPress reads to generate CSS custom properties. Learn more in the official theme.json documentation.
The Site Editor: Your Visual Interface
Access the Site Editor from Appearance → Editor in your WordPress admin. Here you can:
- Edit templates and template parts visually
- Manage your navigation menus
- Browse and insert block patterns
- Customize your site’s global styles (colors, fonts) in real-time
- Manage pages from within the editor
The Styles panel (the half-circle icon) lets you tweak your design system without editing code — changing fonts, colors, and spacing with live preview.
Should You Switch to FSE?
FSE is ideal if:
- You’re starting a new site
- You want to avoid a page builder dependency
- You’re building client sites and want maintainable, future-proof code
- You want tight integration with WordPress’s native patterns and styles
Stick with a classic (PHP) theme if:
- Your existing site runs on a mature, battle-tested theme with no issues
- Your workflow depends on WooCommerce templates that haven’t fully migrated to blocks yet
- Your team has deep PHP expertise but no block development experience
Learning Resources
The FSE learning ecosystem has grown significantly. Here are the best places to learn:
- learn.wordpress.org — Free official courses and workshops
- Theme Developer Handbook — Technical reference for theme development
- fullsiteediting.com — An excellent community resource run by Carolina Nymark
- Gutenberg Best Practices by 10up — Opinionated development guide from a major WordPress agency
The Bottom Line
Full Site Editing has crossed the threshold from “promising experiment” to “production-ready toolset.” The learning curve is real, but the payoff — clean markup, design consistency, and deep WordPress integration — is worth it. Start with a well-structured starter theme, explore the pattern directory, and build incrementally. The future of WordPress development is blocks-first.
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