Your questions begs further questions. You are seeing your image as it is, the true size it is. Anything else is a scaling of the image to fit the space. Now the question that this beggars is why are you sending huge images by email? If it was for photo editing or the like that would be understandable, For general emailing of happy snaps for instance you usually need to modify the file type and image resolution that comes from the camera for sending in email. The files camera make can be huge, and the compressed JPG files they spit out, while being much smaller that the rsw data are still unacceptably large. So open you images in a photo editing software and export than as PNG files resized to what you want. This appear to be a good discussion of file types you can use. https://www.photoup.net/differences-between-file-formats-raw-dng-tiff-gif-png-jpeg/ Why answer this question in such a roundabout way? Because adding huge images makes uploading your mail slower and can make delivery less reliable. Adding only a few images can result in the email being to large for the mail server to accept or if it accepts it deliver it. You can scale your image, but that does not make the size of your email smaller, only the size shown in the email. Double click the image after you drag it. Click the dimension tab in the dialog that appears Modify the width of the image in Pixels, or as a percentage of the screen. I suggest you use 50% of the screen for both. This will give a distorted aspect to the image as the shape will be wrong. Once the image is of a size you can cope with there are boxes on the corners when you select the image. You can click on the bottom right one and drag the image to the size and aspect you like.