There are number of online and offline web applications that allows you to resize images by entering resultant image size or dimension. ‘ResizeImage.org’ is a cool online image resizing application with a difference.
Unlike entering dimensions of final resized image, you can drag the image and resize accordingly. To get started, browse and upload image from your computer. You can click on small, medium, large, original options for resizing.
Click on ‘advanced editor’ option, then you can resize image by dragging it from any corner. You can tick the option to keep width and height proportional and then drag from corner to enlarge or reduce size of image. You can also see final image dimensions on the left side menu as you drag the uploaded image - checkout ResizeImages.org