The purpose of this thesis is to compare mass digitization and qualitative digitization, to see how the digitization process and the digitalized material differ. The study emanates from the mass digitization as it is performed at the National Library in Norway, and the qualitative digitization at the Royal Library in Sweden. The method used is document studies combined with mail interviews. The focus is upon the practical operation, to which counts: “purpose & selection”, “preparation, image capturing and processing”, “metadata & text encoding”, “quality assessment”, “storage of digital originals and copies” and “display”. The result showed that the mass digitization automatize the process as far as possible and uses uniform methods of whole collections. They have minimal preparation, processing and quality controls, if it doesn’t make the digitization quicker. During qualitative digitization the most parts are done manually, where every moment and object is prepared, processed and controlled considering what is best for the original. The result of the product of digitization – the digital documents – showed that qualitative digitization prefers aspects like caution and security, as they among other things uses the well established file format TIFF, and uses sufficiently high quality in methods to preserve all information from analogue documents, and store both processed and unprocessed versions of the digitization. Mass digitization is more insecure as they use the non-established file format JPEG2000, and the digital master is processed, compressed (lossless) and cut.