To test a WordPress website, check for visual changes on pages affected by any plugin or theme update, verify that key SEO fields haven’t been cleared or overwritten, and confirm that internal and external links still resolve.
WordPress sites are particularly prone to unexpected visual changes after updates because plugins and themes each load their own CSS. When a plugin updates its stylesheet, those new rules can conflict with or override your theme’s styles across every page that loads both.
A single update can silently alter or break the layout of dozens of pages without any individual page being directly edited.
What Is WordPress Testing?
WordPress testing means checking your website after updates to confirm pages still look right, links work, SEO fields are intact, and performance hasn’t degraded. It covers plugin updates, theme changes, content edits, and any update that affects how pages appear to visitors.
Some WordPress testing focuses on code, plugin compatibility, or sandbox environments. This guide focuses on what happens to your WordPress website after updates go live: what changed, what broke, and what needs to be fixed. For a broader guide to website testing across platforms, see the Website Testing Complete Guide.
Why Do WordPress Websites Break After Updates?
WordPress sites often break after updates because the site is made from many separate parts: plugins, themes, page builders, blocks, and custom code. Each part can add its own styles, scripts, and templates, and they do not always interact predictably.
For example, a plugin update might change the CSS for a form or button. If that style is used across the site, the change can affect every page using that plugin, not just one page.
The plugin author may have tested the update in their own setup, but not against your theme, your page builder, and every other plugin on your site.
The same pattern applies to theme updates and page builder updates. WordPress block editor updates have shifted heading and paragraph spacing across sites without any visible warning. For example, a WooCommerce update can change how checkout sections display, especially if the site uses custom styling.
The result is that after a routine update cycle, a WordPress site can have visual problems spread across many of its pages — problems that only appear in a browser, not in the admin view.
For a closer look at how small website updates can create issues on pages you never touched, see What Breaks When You Update a Website.
What Should You Check After Updating WordPress?
Four areas are worth checking after a WordPress update, especially if the update affects plugins, themes, templates, or key pages.
Visual layout. Check whether important pages still look the way they should. Focus on spacing, font sizes, button alignment, section widths, mobile layouts, headers, footers, sidebars, and forms. If the update touched a shared component, check every page type that uses it.
SEO fields. SEO plugins and CMS changes can affect meta titles, meta descriptions, and other page fields. After an update, check that important pages have not been reset to blank fields or generic plugin defaults. Review key landing pages, product or service pages, and recently published posts.
Performance. Plugin updates can add JavaScript, third-party scripts, or heavier assets that slow down important pages. After a significant update, check load time on key pages. A new script that adds two seconds to your homepage is worth catching.
Links. Internal links can break after slug changes, permalink updates, page deletions, or site restructures. External links can go stale when third-party pages move or return errors. After an update, check high-traffic internal links and important external links such as booking links, partner pages, and embedded resources.
How Do You Find Visual Changes After WordPress Updates?
WordPress visual regression testing means comparing how a page looked before an update with how it looks after. Instead of relying on someone to notice changes manually, it highlights visual differences between the two versions.
The challenge is that WordPress creates many possible failure points. A single plugin update can change shared CSS that affects every page using that plugin — sometimes many pages at once. Checking a small sample by hand can miss the issue entirely if the affected pages are not on the sample list.
Visual regression testing makes this more systematic. Instead of scrolling page by page, you get a list of pages where something actually changed.
In WordPress, common visual regressions include:
- Layout shifts from plugin and theme style conflicts
- Typography changes from WordPress block editor updates
- Mobile layout issues from updated plugin CSS
- Navigation or footer changes caused by shared templates
For a practical starting point, pick 10 to 20 pages that represent the main templates on your site, such as the homepage, a service page, a blog post, a landing page, and a contact page. Check them after every update cycle. For a complete implementation guide, see How to Implement Visual Regression Testing.
How Can You Check More Pages Without Reviewing Everything Manually?
For WordPress sites with more than 30 pages, checking every page manually after updates is not a realistic workflow. An update that touches shared styles can affect pages across the site, and manual review is hard to fit around everything else your team needs to do.
Sitepager scans your website using your URL and compares each page to a saved baseline. If a CSS change affects 40 out of 100 pages, it shows those 40 pages as changed so your team does not have to find the issue one page at a time.
Sitepager does not require a WordPress plugin and does not add load to your WordPress server. It reviews your website in a browser, whether that is your live site, staging site, or another URL your team wants to check.
After a WordPress update, your team can run a Sitepager check to see what changed and what needs attention: visual changes, broken links, missing SEO fields, page additions or removals, and performance issues. Fix anything unexpected, then use the reviewed version as the baseline for future checks.
How Do You Make WordPress Testing Repeatable?
WordPress testing works best when it covers both planned changes and background changes.
Planned changes are the updates your team knows about: plugin updates, theme changes, content edits, landing page updates, template changes, or new pages. For these changes, add a review step to your update workflow. Update the website, check the affected pages, and fix anything unexpected.
But not every WordPress change is deliberate. WordPress can apply minor core releases automatically. Plugins with auto-update enabled can update in the background. Hosting-level changes, third-party scripts, or embedded tools can also affect how pages look or work without anyone editing the page directly.
That is why a regular review cadence matters. For most active WordPress sites, a weekly check is a reasonable starting point. It gives your team a way to catch background changes, such as a plugin update that shifts a layout over the weekend, before the issue sits unnoticed for days.
With Sitepager, you can run checks after planned updates and schedule regular checks for background changes, so both planned and background changes get reviewed.
A simple repeatable workflow looks like this:
- Keep a baseline of the site version you trust.
- Check the site after planned updates.
- Schedule regular checks for background changes.
- Review what changed and what needs attention.
- Fix anything unexpected.
- Use the reviewed version as the new baseline.
This turns WordPress testing from a one-off task into a repeatable review step for every meaningful update, planned or automatic.
WordPress Testing FAQs
How do you test a WordPress website?
To test a WordPress website, check pages for visual changes after plugin or theme updates, confirm key SEO fields are still present, and verify that internal and external links still work. For larger sites, use a tool that compares pages across update cycles so shared template changes are easier to catch without reviewing every page manually.
What breaks visually after a WordPress plugin update?
A WordPress plugin update can change the styles or scripts that affect pages using that plugin. Common issues include layout shifts, spacing changes, mobile display problems, button styling changes, and navigation or footer sections moving unexpectedly.
How do you find broken links in a WordPress site?
Check internal links after slug changes, permalink updates, page deletions, or site restructures. External links can also go stale over time. For larger sites, running a link check after each update cycle is more reliable than manually sampling a few pages.
What SEO issues appear after a WordPress update?
WordPress updates can affect SEO fields if they touch SEO plugins, CMS data, templates, or permalink settings. Common issues include missing meta titles, blank meta descriptions, changed canonical URLs, redirect chains, and cleared custom fields. After major updates, review SEO fields on key pages.
How do you run visual regression testing on a WordPress site?
Visual regression testing on a WordPress site works by capturing screenshots of key pages before an update, capturing them again after the update, and comparing the two versions. For marketing teams without developer resources, tools like Sitepager can do this without requiring a WordPress plugin. The tool checks the website in a browser and surfaces pages where something changed visually after the update.
Does Sitepager work with WordPress sites?
Yes. Sitepager works with any website, including WordPress sites, without requiring a plugin installation or any changes to the WordPress setup. It checks the website in a browser — live site, staging site, or any URL your team wants to review — and compares it against a saved baseline. It catches visual changes, broken links, missing SEO fields, page additions and removals, and performance issues.
