Have you ever uploaded images to your WordPress site and wished you could reduce their size? Resize Image After Upload is just the plugin for the job. It automatically compresses images (JPEG, GIF, or PNG) as they are uploaded to your site. You can change max image dimensions and compression options from the options page.
Resize Image After Upload could prove helpful to those who want to reduce their server space usage while uploading more images. It makes sure extremely large images are not stored on your server. The bad news? The plugin does not resize images that have already been uploaded at this time. This is a free script.