Images can make a blog post easier to follow, but readers who can’t see them need another way to understand what they show. That’s where blog image alt text comes in. A concise, accurate description helps screen reader users understand meaningful images and gives search engines additional context about a page.
Writing alt text doesn’t mean describing every visual detail or squeezing a target keyword into every image field. The aim is to communicate the image’s purpose in its specific location. This guide explains how to decide what needs alt text, write descriptions that serve readers, and add them in WordPress.
What blog image alt text does
Alt text is a written description associated with an image in a webpage’s HTML. Assistive technology can read it aloud, giving people who can’t see the image access to relevant information. When an image fails to load, the text may also appear in its place.
Alt text is different from an image caption, which is usually visible to everyone, and from a file name, which helps you identify an image in your media library. A caption can offer context or commentary; alt text should communicate the image’s important content or function. You don’t need to repeat the caption word for word.
Alt text can also help search engines interpret an image, but it isn’t a shortcut to higher rankings. Describe the image naturally and accurately. Don’t add keywords that aren’t supported by what the image shows.
Decide whether an image needs alt text
Before writing a description, consider what the image contributes to the post. The right choice depends on its role, not just its appearance.
- Informative images: Add alt text when a photo, diagram, chart, or screenshot conveys information that matters to the article.
- Functional images: Describe an image based on what happens when someone selects it. For example, an image that links to a recipe should identify the link’s destination or action.
- Decorative images: Leave alt text empty when an image is purely visual and doesn’t add information or functionality. An empty alt attribute lets screen readers skip it instead of announcing irrelevant details.
Ask yourself: If this image disappeared, would a reader lose information needed to understand the post? If yes, write alt text that supplies that information. If no, and the image serves only as decoration, an empty alt attribute is usually more helpful than a description of the scenery.
Some images serve more than one role. A picture of a product might be decorative in one article but essential in a product comparison. Judge each image in context rather than applying one rule to every photo on your site.
How to write useful blog image alt text
A good description is specific enough to convey the important content and brief enough to be understood quickly. Use these steps as a practical check.
1. Identify the image’s main point
Look at the image and ask what a reader needs to know from it. For a photo of a finished dish in a recipe post, the dish itself may be the main point. For a screenshot in a tutorial, the relevant detail might be a particular setting or button. You don’t have to list every object in the frame.
2. Consider the surrounding text
Read the paragraph and heading near the image. The article may already explain much of what the image shows, so the alt text can focus on the detail that the words don’t cover. On the other hand, don’t assume a reader can see the image just because the paragraph refers to it.
3. Use plain, concrete language
Describe what is present and, when it matters, what is happening. For example, “A red bicycle leans against a brick wall beside a storefront” gives a reader a clearer picture than “Nice bike outside.” Use terms your audience would understand, not strings of tags or technical language without a reason.
4. Keep the description focused
Include details that help explain the image’s meaning, such as a relevant color, location, relationship, or action. Leave out decorative observations and guesses. There’s no need to begin with “Image of” or “Picture of,” because screen readers already identify the content as an image.
5. Check that it works in context
Read the alt text together with the nearby sentence. Does it add useful information without repeating the same wording? Would someone understand the point of the image without seeing it? Revise if it’s vague, redundant, or misleading.
Examples of stronger alt text
These examples show how the same subject can be described differently depending on the image’s purpose.
- Weak: “Garden.” Stronger: “Three tomato seedlings growing in separate pots on a sunny windowsill.”
- Weak: “Blog SEO keyword.” Stronger: “Search settings panel with the page title field highlighted.”
- Weak: “A delicious cake.” Stronger: “A lemon cake cut into slices and topped with powdered sugar.”
The stronger examples don’t try to turn the description into a list of search terms. They give a reader a useful sense of what the image contains. If the article explains how to use a specific setting, you might describe the selected option rather than every element in the screenshot.
Charts and diagrams need particular care. Include the main takeaway in the alt text when it can be expressed briefly. If a chart contains detailed data, provide that information in the article or an accessible table rather than expecting a long description to do all the work.
Add alt text in WordPress
WordPress lets you enter alt text for images in the Media Library or while editing a post. The labels may vary slightly depending on your editor, theme, or installed plugins, but the process is straightforward.
- Open the post in the WordPress editor and select the image block.
- Find the block settings in the sidebar and locate the field labeled Alt text or Alternative text.
- Write a short description that reflects the image’s role in that post.
- Save or update the post, then preview the page to make sure the image and nearby content make sense together.
You can also open Media in the WordPress dashboard, select an image, and enter a description in its attachment details. This is useful when preparing images before inserting them. Still, review alt text in the post itself: an image’s purpose can change depending on the article where it appears.
For a decorative image, use the editor’s option for marking it decorative if available, or leave the alt text field blank. Don’t type “decorative image” into the field; that makes a screen reader announce information that doesn’t help the reader.
Common alt text mistakes to avoid
- Keyword stuffing: A string of search terms is difficult to understand and may misrepresent the image. Describe what’s actually there.
- Repeating nearby text: If the caption and paragraph already explain the image, use alt text to add the missing visual detail instead of repeating them.
- Writing an inventory: Listing every object, color, and background detail can bury the point. Include only what matters in context.
- Guessing at details: Don’t infer someone’s identity, emotions, or intentions from an image. Stick to visible, relevant facts.
- Using a file name as a description: Names like “IMG_4812.jpg” tell readers nothing. Write a human-readable description in the alt text field.
- Leaving meaningful images undescribed: A relevant chart, instructional screenshot, or product image shouldn’t be skipped just because it looks obvious to you.
Also avoid using the same generic alt text for every image in a post. Each description should match its individual image and purpose.
A quick review process for published posts
You don’t need to rewrite every description on your site at once. Start with posts that receive steady visits or rely on images to explain instructions, comparisons, or results. Open each page and review images in order:
- Identify images that communicate information or perform a function.
- Check that each has an accurate, context-specific description.
- Remove unnecessary text from purely decorative images.
- Compare alt text with captions and nearby paragraphs to catch repetition.
- Preview the updated post to confirm the image still supports the article.
For a broader approach to organizing accessible, readable articles, see this guide to planning and writing a blog post. A consistent publishing checklist can remind you to review image descriptions before a post goes live.
Useful alt text is a small editorial decision with a practical purpose: it helps more readers understand the images that matter. Describe the image’s contribution, keep the wording natural, and leave purely decorative visuals out of the way.