Image Resize Filter

Update Nov 10, 2015: WARNING: check the issue queue for known issues before using this and decide if you can live with the bugs. https://www.drupal.org/project/issues/image_resize_filter?categories=1

"The easiest end-user solution for resizing inline images.

This filter makes it easy to resize images, especially when combined with a WYSIWYG editor such as tinyMCE or CKeditor. Users never have to worry about scaling image sizes again, just insert an image and set it's height and width properties in HTML (this is done automatically by WYSIWYG editors) and the image is resized on output to match the HTML."