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Choose the right WordPress HTML editor
| What you want to change | Use this | Where it applies |
|---|---|---|
| A snippet within one post or page | Custom HTML block | The selected location in that post or page |
| The entire post or page as markup | Code editor | All content in the open post or page |
| A template, header, footer, or other site structure | Site Editor | Available when a block theme is active |
These tools have different scopes. Editing a post’s code does not edit its theme template. See WordPress.org’s Custom HTML guide, its Block Editor guide, and documentation for block themes and the Site Editor.
Add HTML to one post or page
For an embed or other self-contained markup that belongs in a particular place in your content, add a Custom HTML block.
- Open the post or page in the block editor.
- Insert a block using the Block Inserter and choose Custom HTML. Alternatively, type
/htmlin a new paragraph block and press Enter. - Enter or paste your markup into the block. If the editor shows Edit HTML, select it before entering code.
- Use the block’s preview to inspect the rendered result, then choose Update to save the post or page.
The block stores its markup in the post content; it is not a place to change a site-wide template. WordPress.org documents the block and its preview in the Custom HTML instructions.
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Switch the whole post or page to code view
Use the block editor’s Code editor when you need to inspect or edit the complete content of the open post or page as HTML, rather than adding a single block.
- Open the post or page in the block editor.
- Open the three-dot Options menu.
- Choose Code editor instead of Visual editor.
- Edit the post or page markup, then switch back to Visual editor if desired and update the content.
This changes the editing view for that post or page. It does not expose or edit the site’s PHP theme files or block-theme templates. WordPress.org describes this editor option in its Block Editor documentation.
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Edit templates and site structure
To work on structural areas such as a site header, footer, navigation, or template, use the Site Editor if the site has a block theme active.
- In the WordPress dashboard, go to Appearance > Editor.
- Open the relevant template or template part and make the structural changes using the available editor controls.
- Review the result before saving your changes.
Block themes use blocks for all parts of the site. Classic themes instead use PHP templates and do not provide the same Site Editor template workflow. If Appearance > Editor is unavailable, check which theme is active; the Site Editor is not a general-purpose HTML editor for every WordPress theme. See the official guidance on block themes and the Site Editor.
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Some code can be filtered when a user does not have the unfiltered_html capability. WordPress.org’s documentation says that, starting in WordPress 7.0, the Custom HTML block has separate HTML, CSS, and JavaScript panels; the CSS and JavaScript panels require that capability. A role such as Contributor may lack it. In that situation WordPress can sanitize the block with wp_kses() when the post is saved or updated, removing disallowed markup such as <script> or <iframe>.
If code disappears after saving, first check your role, the site’s capability configuration, and the installed WordPress version. This behavior is a permission and security restriction, not necessarily a mistake in your markup. The documented capability behavior is described in the Custom HTML block guide; available controls and permissions can vary by site configuration.
Quick Recap
Quick fixes when an edit does not appear
- The code is in the wrong place: use a Custom HTML block for content within one post or page; use the Site Editor for block-theme structure.
- The saved result differs from the preview: inspect whether your account has
unfiltered_htmland whether WordPress sanitized restricted markup on save. - You cannot find the Site Editor: confirm that a block theme is active; classic themes use a different template system.
- You only need to see the full post markup: open Options and select Code editor rather than searching for a theme-editing screen.
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