A lightbox box plugins which adjusts the images automatically

For my client I need a plugin which can act as a lightbox effect. This plugin should automatically adjust the images which are added to the page where the images will be. I have been testing a few plugins which act as a lightbox, however those weren’t what I needed. I am very sure that my client won’t be added any necessary code to each image. If possible, is there one which doesn’t need anything extra for the plugin to work? Thanks in advance.