We present the most common methods for the lensless visualization of individual molecules with an atomic resolution. The visualization is understood as a formation of an image by the lensless method and its subsequent numerical reconstruction. The basic principles of a formation of images of objects of study by the lensless method are presented. Discussions of holographic images of the objects of study, formed by the classical in-line method (in-line holography), with low-energy electrons are presented. Practical methods of modeling and numerical reconstruction of holographic images formed by the lensless method are presented.