A Quick Guide to Changing Image Alt Text in WordPress

Images play an important role in making a website visually engaging. They help break up text, explain ideas more clearly, and improve the overall user experience. However, images also need to be understood by search engines and accessible to all visitors. This is where image alt text becomes important. Alt text, short for alternative text, is a written description that explains what an image represents. It helps search engines understand the image content and ensures that people using screen readers can still understand what appears on the page. Many WordPress users upload images regularly but are not always aware of the importance of alt text. Without proper alt descriptions, images may provide less value for search engine optimisation and accessibility. The good news is that WordPress makes it easy to add or update alt text when uploading images or editing content. With a few simple steps, website owners can improve both the accessibility and search performance of their site. In this guide, we explain what image alt text is, why it matters, and how to change image alt text in WordPress using the media library or page editor.

What Is Image Alt Text in WordPress?

Image alt text, often called alternative text, is a short written description of an image. It appears in the HTML code of a webpage and helps describe the image for users who cannot see it. The primary purpose of alt text is to explain the content of an image when it cannot be viewed directly. This may happen for several reasons. Alt text is used when:

Images fail to load properly
Screen readers read website content aloud
Search engines analyse page content

When a screen reader encounters an image, it reads the alt text aloud so that visually impaired users understand what the image represents. WordPress includes a built in field for adding alt text whenever an image is uploaded to the media library. This allows website owners to add a short description that explains the purpose of the image. It is also helpful to understand the difference between several common image fields in WordPress. The image file name is the name of the file that was uploaded, such as team-meeting.jpg. The image title is an optional label used within WordPress to organise media files. A caption is text that appears directly below an image on the webpage. The alt text is the description used by search engines and screen readers to understand the image content. For SEO and accessibility, the alt text field is the most important one to complete.

Why Image Alt Text Is Important for SEO and Accessibility

Image alt text plays an important role in both search engine optimisation and web accessibility. By providing a clear description of images, website owners help search engines and visitors better understand their content.

SEO Benefits

Search engines cannot view images in the same way humans do. Instead, they rely on surrounding text and image metadata to understand what an image represents. Alt text provides this context by describing the content of an image. When search engines analyse a page, the alt text helps them determine how the image relates to the overall topic of the content. Well written alt text can also help images appear in image search results. This can bring additional traffic to a website through Google Image search. Alt text therefore contributes to better image optimisation and supports overall SEO performance.

Accessibility Benefits

Alt text is also essential for accessibility. Many people rely on screen readers to browse the internet. Screen readers read webpage content aloud so users can understand the information on the page. When a screen reader encounters an image, it reads the alt text description. Without alt text, the user may not understand what the image represents or why it is included on the page. Alt text can also help users with slow internet connections or browsers that have images disabled. Maintaining SEO elements such as image optimisation is part of good website upkeep. A reliable WordPress maintenance service can help ensure that images, SEO elements, and website performance remain properly managed.

How to Change Image Alt Text in the WordPress Media Library

One of the easiest ways to edit image alt text is through the WordPress media library. This section stores all images and media files that have been uploaded to the website. Follow the steps below to update alt text for an image.

Step 1 - Access the WordPress Media Library

Start by logging into your WordPress dashboard. From the dashboard menu, navigate to Media → Library. The media library displays all images, videos, and files that have been uploaded to your website. This section allows you to view and manage media files used throughout your site.

Step 2 - Select the Image

Locate the image you want to edit and click on it. This opens the attachment details panel. The attachment details panel shows information about the selected image, including:

File name
Title
Caption
Description
Alt text field

This panel allows you to edit the information associated with the image.

Step 3 - Edit the Alt Text Field

In the attachment details panel, locate the Alt Text field. You can enter a new description or replace any existing alt text. The description should clearly explain what the image represents. For example, instead of writing “image” or “photo”, you might write a short description such as “small business owner working on laptop in office”.

Step 4 - Save Changes

In most cases, WordPress automatically saves changes made within the media library. Once the alt text has been updated, the new description will be used whenever that image appears on your website. It is always a good idea to check the page where the image is used to confirm everything displays correctly.

How to Edit Image Alt Text While Editing a Page or Post

Alt text can also be edited directly when working within the WordPress page or post editor. This method is often convenient when updating content or adding new images.

Step 1 - Open the Page or Post Editor

Begin by navigating to the page or post where the image appears. You can do this by selecting:

Pages → Edit, or
Posts → Edit

This will open the WordPress block editor where your content is managed.

Step 2 - Select the Image Block

Click on the image you want to edit within the content area. When the image block is selected, additional settings appear in the block settings panel on the right side of the screen. Within these settings you will see the Alt Text field.

Step 3 - Add or Update Alt Text

Enter a short description that explains what the image shows. The alt text should describe the image clearly while reflecting its purpose within the content. If the image supports a specific topic, the description can reference that topic naturally.

Step 4 - Update the Page or Post

After editing the alt text, remember to update or save the page. Previewing the page before publishing is helpful to ensure that the image and surrounding content appear correctly.

Tips for Writing Effective Image Alt Text in WordPress

Writing good alt text is important for both SEO and accessibility. Clear descriptions help search engines understand images while also assisting users who rely on screen readers. When writing alt text, consider the following guidelines:

Describe the image clearly and concisely
Focus on the purpose of the image within the page content
Include relevant keywords naturally when appropriate
Keep the description short and meaningful
Avoid repeating surrounding text unnecessarily

Alt text should provide useful context rather than simply listing keywords. A natural description of the image is usually the most effective approach. By writing descriptive alt text, website owners improve both the usability and search visibility of their content.

Common Mistakes When Adding Alt Text to Images

Although alt text is simple to add, website owners sometimes make mistakes that reduce its effectiveness. Some common issues include:

Leaving alt text blank when the image contains useful information
Adding too many keywords in the alt text description
Writing descriptions that are too long
Using vague descriptions such as “image” or “photo”
Repeating the exact page title within the alt text

Poorly written alt text can reduce the benefits of image optimisation and accessibility. Reviewing images regularly helps ensure that alt text descriptions remain accurate and useful.

Managing Image Alt Text Across Your WordPress Website

Most websites contain many images across different pages and posts. As a result, managing alt text consistently becomes an important part of maintaining a high quality website. One helpful strategy is performing regular image audits. Reviewing older pages can reveal images that are missing alt text or have outdated descriptions. Consistent naming practices also make image management easier. Using clear file names and descriptive alt text helps maintain organisation across the website. Updating alt text can also improve existing content. Older articles may benefit from refreshed image descriptions that better match the topic of the page. Some SEO and accessibility plugins can help identify images that are missing alt text. These tools can highlight areas where improvements are needed. Maintaining image optimisation across a website contributes to better SEO performance and improved accessibility. If you need help managing website content, SEO updates, or ongoing maintenance tasks, you can get started with Fly High Web for professional support.

Written by

Jess Simpson

Jess is an Assistant at Fly High Web, where she helps maintain and update client websites to keep them secure, efficient, and visually consistent. She enjoys combining creativity with technical problem-solving to improve site performance and user experience. With a strong eye for detail and a proactive approach, Jess supports the team in ensuring every website runs smoothly and reflects the quality of each client’s brand.

Published: March 17, 2026