Why image alt text matters on a modern website
Alt text is the short, written description attached to an image so people and software can understand what the image communicates when the image itself is not available. On a modern site, that usually means one of two things: a screen reader reads it aloud, or a browser shows it when an image fails to load. Neither is glamorous, but both are useful. A website full of images with no descriptions is basically handing the job to guesswork.
For a practical baseline, the WordPress Accessibility handbook recommends writing alt text for informative images and leaving decorative images empty. WCAG 2.2 backs the same principle: non-text content needs a text alternative that serves the same purpose when the image carries information. If you want the standard itself, the W3C WCAG 2.2 guideline spells it out plainly.
Good alt text is not a caption. It is the equivalent of a concise answer to the question, “What does this image add?” If the image is a chart showing page traffic, the alt text should explain the takeaway. If it is a team photo used as a banner, the alt text should identify who or what matters in the scene. If it is just a decorative divider, leave it empty and let the browser mind its own business.
How alt text improves accessibility for screen reader users
Screen readers announce the alt text in place of the image content, so a good description helps a visitor understand the page without needing the picture. That is the core accessibility job. It is also where vague alt text gets exposed immediately. “Image of a team meeting” is rarely enough if the image is supposed to show a content review workflow. “Two editors comparing image captions in the WordPress Media Library” is better because it says something useful.
For example:
- Informative image: Alt text: “WordPress editor comparing image alt text fields before publishing a blog post.”
- Decorative image: Alt text: empty
- Functional image: Alt text: “Search the media library” if the image is a button or icon that triggers search.
If you want a standards-based refresher, the U.S. Section 508 image guidance is a practical companion. It says the quiet part out loud: text alternatives should serve the same purpose as the image, not merely describe pixels for sport.
How alt text supports search engines and content clarity
Alt text helps search engines understand what an image is about, which can support visibility in image search and improve the clarity of the page as a whole. It is not a ranking cheat code. No honest article can promise that. But good alt text does remove ambiguity from the page, and search engines are famously fond of ambiguity only when they are not the ones paying for it.
The bigger win is content clarity. When your image and surrounding copy say the same thing in different forms, readers get a cleaner, more consistent page. That matters for product pages, tutorials, service pages, and blog posts that rely on screenshots or process photos. Google’s own helpful content guidance pushes the same direction: write for people first, make pages easy to understand, and avoid stuffing metadata with nonsense.
A simple pattern works well:
- state what the image shows,
- name the relevant object or action,
- leave out details that do not help the reader,
- do not repeat the entire caption word-for-word unless that is actually useful.
What to write in WordPress Media Library fields
WordPress gives you four common image fields, and they do different jobs. Mixing them up is how editors end up with a media library full of elegant confusion.
| Field | Purpose | What to write |
|---|---|---|
| Alt text | Accessible text alternative for the image | Describe the image’s meaning or function in the page context |
| Title | Internal media label | A short, useful name for editors, such as “WordPress media settings screenshot” |
| Caption | Visible text below the image | A short explanation or source note if readers need it |
| Description | Longer media note in the library | Extra context for editors, reuse notes, or source details |
When you upload an image in WordPress, the Image block documentation and Learn WordPress Media Library lesson both point to the same workflow: add alt text while you are already looking at the image, not after the page has shipped and everyone has moved on to the next small fire.
A practical writing test:
- If the alt text is too long to speak naturally, trim it.
- If it repeats the surrounding paragraph exactly, rethink it.
- If it sounds like a file name wearing a fake moustache, rewrite it.
When to leave alt text empty for decorative images
Decorative images add visual structure but no information. Think background flourishes, spacing dividers, or icons that do not carry meaning on their own. For those images, the right choice is often empty alt text so screen readers can skip them instead of narrating design wallpaper.
This is not a loophole; it is the correct implementation. Empty alt text reduces noise for people using assistive technology. The key is to be honest about whether the image communicates anything. If the image supports the content, it needs alt text. If it is purely decorative, it does not.
When in doubt, ask one question: Would removing this image change the meaning of the page? If the answer is yes, write alt text. If the answer is no, leave it empty.
Common mistakes to avoid when adding images during a site rebuild
Most image problems are not dramatic. They are just repetitive. That is worse in a way, because repetition scales.
- Using the file name as alt text:
IMG_4821.jpgis not an accessibility strategy. - Writing alt text that is too vague: “Screenshot” is technically true and practically useless.
- Stuffing keywords into alt text: Search engines can smell that from a mile away.
- Repeating the caption and alt text verbatim: Sometimes fine, often lazy.
- Giving decorative images descriptive alt text: This creates noise for screen reader users.
- Skipping image review before publishing: The last step is where broken workflows like to hide.
If your page uses screenshots, remember that the surrounding text should explain the action in the image. A screenshot should support the lesson, not become the lesson. The same rule applies to team photos, process photos, and interface captures.
A simple checklist for publishing image-rich pages
Before you publish, run this checklist:
- Does every informative image have meaningful alt text?
- Are decorative images left empty?
- Do the caption and alt text serve different jobs?
- Are filenames and titles readable for editors?
- Do the images support the article topic instead of distracting from it?
- Have you reviewed the page on mobile and desktop?
- Does the page still make sense if the images do not load?
- Are the internal links useful and natural?
For internal context, readers can always return to the homepage, learn more on the About page, or use the Contact page if they need help with a page or image workflow. If they want more practical writing and publishing advice, the blog is the obvious next stop.
The cleanest image workflow is not complicated. It is just disciplined: write for meaning, separate decorative from informative visuals, and treat the Media Library like part of the publishing process instead of a digital junk drawer. That alone fixes more pages than people expect.