How to SEO images in WordPress

Image SEO in WordPress comes down to three core optimization areas that directly impact both search visibility and user experience. The foundational step is naming your image files descriptively before upload. Instead of uploading "IMG_2847.jpg," rename it to something like "blue-ceramic-coffee-mug.jpg" that reflects the image content and includes relevant keywords naturally. This filename becomes part of the image URL and helps search engines understand what the image depicts.

Once uploaded to WordPress, fill out the image metadata fields in the media library. The alt text field is critical—this is what screen readers use and what Google relies on when it can't visually analyze an image. Write alt text that describes the image accurately and includes target keywords where they fit naturally. For that coffee mug example, "blue ceramic coffee mug on wooden table" works better than "coffee mug" because it's more descriptive. The Title and Caption fields should also contain relevant information, though alt text is the priority. The Description field in WordPress is visible to users and helps provide context around the image on the page.

Beyond the basic fields, consider your image file size and format. WordPress automatically generates multiple image sizes, but you should compress images before uploading to keep page load times fast—something like TinyPNG or built-in WordPress optimization plugins helps here. Use modern formats like WebP when your hosting supports it. Additionally, use descriptive text around your images. When you embed an image in a post or page, include nearby text that reinforces what the image shows, which provides context for search engines and improves overall page relevance for your target keywords.

For agency clients handling multiple images, consider using an image SEO plugin like Yoast SEO or Rank Math, which remind you to optimize alt text and suggest improvements. These tools integrate into the WordPress editor and catch missing optimizations before publishing. For images that appear multiple times across the site, like logos or icons, you still need alt text—logos should use your brand name, while decorative icons can have empty alt text ("") so screen readers skip them, reducing noise for accessibility. The goal is making your images discoverable while improving the overall accessibility and relevance of the pages they appear on.