Images are a great way to enhance your WordPress.com blog, and adding and managing them is easy.

You can upload the following image types to a post or page on your WordPress.com blog:

1. Title - The title displays on the images attachment page.

Note: The title added in this field does notdisplay as a tooltip (when a mouse is hovered over the image). To add a tooltip title, edit the image after inserting it into the post, and add your tooltip wording to the Title field.

2. Caption- Image caption displayed directly underneath the image.

3. Alt Text- The text displayed when the image is not available. This is the text seen by search engines and screen readers.

4. Description -Full image description or other information to accompany the image on its attachment page.

5.Alignment- The position of the image within your post or page. See this page onimage alignmentfor more information.

6. Link to- The URL/web address to which the image will be linked.There are three choices:

7.Size - The size of the image.

See the article here:

Images — Support — WordPress.com