How to Test That Empty Alt Text Actually Works

Setting a decorative image's alt text field to blank in WordPress feels like the end of the task. It isn't. What matters is what actually ships in the page's HTML, and that depends on your theme, your page builder, and how the image was inserted — not just what you typed into a field. Leaving a field blank in the editor doesn't guarantee an empty alt="" attribute shows up in the markup a screen reader reads.

This is the gap that causes decorative images to still announce themselves to assistive technology, or worse, read out a file name, even after someone has "fixed" the alt text. Testing closes that gap.

Three states an image can end up in

There are three possible outcomes when you leave an alt text field blank, and only one of them is correct:

• alt="" — a present, empty attribute. This is the goal. A screen reader sees the attribute, sees it's empty, and skips the image.
• No alt attribute at all. Some themes and page builders drop the attribute entirely when the field is blank instead of writing an empty one. Screen readers handle this inconsistently, and some fall back to reading the image's file name — IMG-4471.jpg — which is worse than either correct state.
• Leftover text. If an image previously had alt text and someone tried to "clear" it by typing a single space or a placeholder like "decorative", the attribute isn't actually empty, and a screen reader announces exactly that placeholder text.

The block editor in WordPress core produces alt="" correctly when you leave the field blank. Older themes, some page builders, and certain gallery plugins don't always follow the same behaviour, which is why this needs checking rather than assuming.

How to check what actually shipped

You don't need a screen reader installed to catch most problems — browser developer tools are enough for a first pass, and a real screen reader check catches what the source code alone can't.

1. Open the published page in your browser and right-click the decorative image, then choose "Inspect" (or "Inspect Element").
2. Find the <img> tag in the developer tools panel and look for the alt attribute.
3. Confirm it reads alt="" — quotation marks with nothing between them. If there's no alt attribute in the tag at all, that's the broken state to fix.
4. If you find text between the quotes that you didn't intend — a leftover description, a single space, a placeholder word — that also needs clearing properly, not just visually blanking the editor field.
5. For a final check, turn on a screen reader (VoiceOver on Mac, Narrator on Windows, or a browser extension like ChromeVox) and tab through the page. A correctly empty decorative image should be silently skipped; you shouldn't hear anything announced for it.
6. Repeat for a sample of image types on your site — content images, product galleries, background-style images inserted as <img> tags, and any images added through page builder blocks rather than the core image block, since these are where behaviour most often diverges.

What to do when the field is blank but the output isn't

If step 3 turns up a missing alt attribute instead of an empty one, the fix isn't in the WordPress editor — it's in how the theme or plugin renders the image. A few common causes: a custom theme template that only outputs an alt attribute when the field has content, an older gallery plugin that predates proper empty-alt handling, or a page builder module that strips empty attributes as part of its output optimisation.

The practical fix, if you can't patch the template yourself, is often to insert a genuinely empty space character isn't right either — that produces alt=" ", which some screen readers still announce as a pause or don't reliably skip. The more reliable workaround is switching that specific image to the core WordPress image block, which handles empty alt correctly, or flagging the issue to whoever maintains your theme.

Why this is worth the extra step

Nobody sees a broken empty-alt attribute by browsing the page visually — it's invisible unless you check the markup or use assistive technology yourself. That's exactly why it's easy to ship. A site can have alt text fields that all look correctly blank in wp-admin while a meaningful number of decorative images are still noisy for screen reader users, simply because the theme didn't translate "blank field" into "empty attribute" the way you'd expect.

Frequently asked questions

How do I check if my WordPress image's alt text is really empty?

Right-click the image on the published page, choose Inspect, and look at the alt attribute on the <img> tag in your browser's developer tools. It should read alt="" with nothing between the quotes. If the attribute is missing entirely, or contains a stray space or leftover text, that's not correctly empty and needs fixing at the template or plugin level, not just in the editor field.

Why would a blank alt text field still produce a missing alt attribute?

It depends on how your theme or page builder renders images. WordPress's core block editor writes alt="" correctly when the field is blank, but some older themes, gallery plugins, and page builder modules only add an alt attribute when there's text to put in it, and drop the attribute entirely otherwise. That's a template-level behaviour, not something you can fix by re-editing the same field again.

Do I need a screen reader to test this, or is inspecting the HTML enough?

Inspecting the HTML catches most problems and is the faster first check — you're confirming the attribute is present and empty. But a real screen reader test (VoiceOver, Narrator, or a browser extension like ChromeVox) is worth doing periodically, because it confirms the actual user experience: that a correctly empty image is silently skipped in practice, not just correct in the markup.

Try OpptiAI Alt Text to manage alt text across your WordPress media library, or run a free image SEO audit to see where your site's images need attention.