ImageDupeless is intended for searching of the similar images in the large collections. The supported graphic file formats are JPEG, GIF, BMP, PCX, PNG, TIFF, PGM, WMF, EMF, and EPS. The comparison is based on the contents of images, not depending on their sizes, formats, resolutions, etc. Their are advanced opportunities of cataloging the galleries available on CDs and of further off-line work with them. At that the comparison of new images with those of included into the gallery takes much less time, than complete rescanning the gallery, and is possible even if the CD itself with imaging data is absent. There are internal facilities for comparison, deletion, movement, and update of files, and change of gallery root directory binding.