In computer terms to resize means to reduce or enlarge file size not physical size. Most programs used for viewing, storing and manipulating photos includes an option to resize (aka change file size) a picture. In many programs it requires you to do a "save as" to save the resized photo. For sharing pics on line a smaller file size does indeed mean less pixels and it does not reduce the clarity of the photo. High pixel count is really only necessary for printing photos in commercial applications like magazines. Most digital cameras have setting options to default all pics to a certain file size. If you reset your camera's settings there is no need to resize the photo for on line sharing.