How to Rotate an Image in the WordPress Editor
A nice little feature that many people need but overlook in the image editor is the ability to rotate photos.
How to Rotate Your Images
When you upload your image, and BEFORE YOU INSERT IT INTO YOUR POST, click the “Edit Image” button directly underneath the image.
Then click the rotate image button on top of the image to get it placed right-side-up.
Photo: Dog Lying Upside Down from BigStock