Changed Your Theme? Your Images Are Now the Wrong Size. Here Is How to Fix All of Them at Once.
WordPress registers specific image sizes when a theme is activated. When you switch themes, the new theme uses different dimensions — and all your existing images are the wrong size. They display stretched, cropped, or blurry. Regenerating thumbnails recreates every image at the correct dimensions for your current theme.
“Your old images do not know your new theme has different sizes. Regenerating thumbnails tells them. One click. Every image fixed.”
Regenerating Thumbnails
Plugin: Regenerate Thumbnails. The standard tool. Install, go to Tools > Regenerate Thumbnails, click the button. It processes every image in your media library — creating new sizes and deleting old unused sizes. Plugin: Force Regenerate Thumbnails. Deletes all old thumbnail sizes before regenerating — ensures a completely clean slate. WP-CLI: For developers: wp media regenerate does the same thing from the command line. When to run: After switching themes that define different image sizes. After changing a setting that affects image dimensions. When images look blurry or incorrect on your new theme. For professional theme switching and image handling, see our WordPress Services page.
“Regenerating thumbnails is a one-click fix for a site-wide problem. Your images look correct. Your site looks professional. Ten minutes of processing.”
