- Go to Plugins → Add New
- Search for ‘Regenerate Thumbnails‘ and click Install under the Regenerate Thumbnails plugin listing by Viper007Bond. This is an actively developed and supported plugin approved by WordPress developers.
- Activate the plugin when complete
- Go to Tools → Regen Thumbnails and click Regenerate Thumbnails. This process can take several minutes, so do not navigate away from the page or close the browser until complete.
- You may open a new tab and continue working in WordPress until the regen finishes.
- When complete, reload your page and the images should be as expected