How to find and fix missing alt text in WordPress
Most WordPress sites have far more missing alt text than their owners realize. Images uploaded over months or years by different contributors, stock photos dropped in without metadata, WooCommerce products with gallery images that nobody thought to describe — the gaps accumulate silently until a site audit or an accessibility review makes them visible.
Fixing the problem starts with finding it. Here is a practical workflow for auditing, prioritizing, and resolving missing alt text at scale.
How to find missing alt text
There are three reliable methods, depending on the tools you have available.
The fastest approach for small sites is the browser inspector. Open a page, right-click an image, select "Inspect," and look at the alt attribute on the <img> tag. If the attribute is empty (alt="") or absent entirely, the image has no alt text. This works for spot checks but does not scale beyond a handful of pages.
For a site-wide audit, use a crawling tool. Screaming Frog, Sitebulb, and Semrush Site Audit all report images with missing alt attributes. Configure the crawler to scan all published pages and filter the results for images where the alt field is empty. This gives you a concrete list of URLs and images that need attention.
If you do not have access to a paid crawler, the free Lighthouse audit in Chrome DevTools can flag accessibility issues including missing alt text on a per-page basis. Run it on your most important pages first: homepage, top landing pages, product pages, and any page that ranks well in search.
Why alt text gaps exist
Understanding the cause helps choose the right fix. The most common patterns are bulk historical content where images were uploaded before alt text was considered important, WooCommerce catalogs where product images were added through CSV imports or bulk uploads without metadata, content from multiple contributors with inconsistent habits, stock photos and media library imports that carry meaningless filenames like IMG_4582.jpg, and theme or builder elements that render images outside the standard content flow.
Each of these patterns suggests a different remediation strategy. A site with 50 missing alt texts on editorial posts needs a different approach than a store with 5 000 product images that were never tagged.
Three approaches to fixing missing alt text
Manual editing
Open each image in the WordPress Media Library, type a description, save. This produces the highest-quality alt text because a human writes it in context. It is also the slowest approach and completely impractical for sites with hundreds or thousands of gaps.
Manual editing makes sense for a small number of high-value images: hero images, key product photos, infographics, and images where descriptive precision matters more than coverage.
Bulk Media Library rewrite
A bulk updater plugin scans the database and writes alt text values into stored metadata. This closes gaps permanently but carries risk: if the rule produces poor output, rolling back requires another bulk operation or a database restore. The change is destructive and irreversible in the sense that it overwrites whatever was there before.
Bulk rewriting makes sense when you have reviewed the output quality, are comfortable with the migration risk, and want the values to persist independently of any plugin.
Dynamic frontend injection
A dynamic injection plugin like Bialty hooks into WordPress rendering and adds alt text to images at the moment the page is served. The Media Library stays untouched. If the rule is wrong, change it. If the plugin is disabled, everything reverts instantly.
Dynamic injection makes sense when the site is large, the risk tolerance for database changes is low, you want to test before committing, or you need coverage across content types that are hard to edit manually — like WooCommerce catalogs with thousands of product images.
How to prioritize which images to fix first
Not all missing alt text is equally urgent. Prioritize based on impact.
Start with pages that receive the most organic traffic. These pages are already being crawled and ranked; adding alt text improves both the page's image SEO and its accessibility signals.
Next, address product pages if you run a WooCommerce store. Product images with missing alt text are missed opportunities in Google Image search, which can drive qualified traffic directly to product pages.
Then handle category and archive pages, blog posts in reverse chronological order (newest first), and finally low-traffic evergreen content.
What makes a good alt text
A good alt text describes the content or function of the image in the context of the page. It should be concise (under 16 words is a practical guideline based on how search engines process the attribute), relevant to the page topic, and written for humans first.
Avoid keyword stuffing. Google explicitly discourages cramming keywords into alt text. A natural phrase that describes the image and relates to the page content performs better than a list of SEO keywords.
For sites that already maintain focus keywords in Yoast, Rank Math, or AIOSEO, using that keyword as a starting signal for alt text is practical — as long as the keyword is specific enough to be meaningful and not so generic that it becomes noise.
Where Bialty fits in the fix workflow
Bialty is designed for the coverage layer. After an audit reveals hundreds or thousands of gaps, Bialty can close them in a single configuration step by injecting alt text from existing SEO context — focus keywords, titles, or image names.
The workflow that makes the most sense for most sites is: audit with a crawler to understand the scope, install Bialty to cover the bulk of the gaps dynamically, then do manual editing only on the small subset of images where automated rules are not specific enough.
That hybrid approach is faster than manual editing, safer than a bulk database rewrite, and produces better overall coverage than any single method alone.