There is no single WordPress theme file to edit: WordPress selects a template according to the page being requested, then uses the most specific matching template available. First identify whether your active theme is classic or block-based, then trace the matching template and check for child-theme or Site Editor overrides.
1. Identify the active theme type
The file you need depends first on the theme system in use. A classic theme uses PHP template files; a block theme uses HTML files containing block markup. The two systems have different locations and override behavior.
| Theme type | Template files | Reusable sections | Where to start |
|---|---|---|---|
| Classic | PHP files such as single.php, page.php, archive.php and index.php. |
May use PHP template parts. | Identify the request type and follow the classic template hierarchy. |
| Block | HTML block templates in /templates/; index.html is required. |
HTML parts in /parts/, often headers and footers. |
Check the Site Editor for saved templates and parts before editing theme files. |
Theme files and the WordPress editor interface can help you tell which workflow applies. A theme’s style.css is required for theme information, but it is not necessarily where a layout or visual change belongs: templates, parts and global styles may control the result. See the WordPress theme structure and getting-started guidance.
2. Name the view you want to change
Be precise about where the change should appear. Is it the front page, one post, a page, a category archive, search results, a 404 screen, or a section shared across several views? WordPress chooses templates based on the request, so describing the view narrows the candidates.
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For a classic theme, use the WordPress template hierarchy to trace candidates from specific to general. WordPress uses the first available match. For example, a category archive can check these files in order:
category-{slug}.phpcategory-{id}.phpcategory.phparchive.phpindex.php
The same principle applies to other request types: choose the hierarchy for the view you identified rather than assuming a particular filename controls every page. In classic themes, index.php is the general fallback.
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3. Check which version of the template takes precedence
Classic themes: account for child themes and specificity
A matching child-theme template can override its parent-theme counterpart, but do not assume that any child file automatically wins. Hierarchy specificity matters: a more-specific parent template can take precedence over a less-specific child template. Compare the matching candidates in both themes against the hierarchy before choosing a file. See WordPress’s template hierarchy documentation.
Block themes: inspect saved Site Editor templates first
A block template or template part edited in the Site Editor can be saved as a database record: templates use the wp_template type, and parts use wp_template_part. The original theme file remains in place, but the saved version may be the one WordPress renders. For block templates, the precedence is user-saved template, child theme’s /templates/ file, then the theme’s /templates/ file. Check the Site Editor before changing a theme file, or the edit may not affect the active version. See the block templates documentation and template parts documentation.
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If the same header, footer or other section appears on multiple views, the change may belong in a template part rather than a page-specific template. In block themes, parts are stored directly in /parts/ and referenced from templates. Editing a shared part can affect every template that uses it, so confirm where it is used before making a broad change. The WordPress template parts guide explains their role.
5. Check theme.json for global settings and styles
When the goal is a site-wide block setting or style rather than a particular page’s structure, inspect theme.json. It configures block settings and styles and can register templates and template parts. The final result may also be affected by WordPress defaults, the theme, a child theme, user configuration and filters; changing a theme value may therefore not be the only factor. See the global settings and styles documentation.
6. Choose the file with this checklist
- Identify whether the active theme is classic or block-based.
- Name the exact view or request type that should change.
- For a classic theme, follow its hierarchy from most specific to the general fallback, checking child and parent candidates.
- For a block theme, check the Site Editor for saved templates or parts, then inspect the relevant
/templates/or/parts/file. - If the change is shared across views, look for a reusable part; if it is global styling or configuration, inspect
theme.json. - Make a backup or use staging or version control when available before changing theme files.
These checks distinguish the theme-file default from the version or configuration currently controlling the rendered page.
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