1. A computer-implemented method for adding an electronic property to electronically converted paper documents, the method comprising: generating a converted electronic document from a paper document; automatically fragmenting the converted electronic document into fragments; identifying content of each fragment of the converted electronic document; searching for one or more electronic documents corresponding to the converted electronic document using the content from multiple fragments; identifying a first electronic document corresponding to a first fragment; identifying a second electronic document corresponding to a second fragment, the first and second electronic documents comprising different documents; extracting electronic properties from the first and second electronic documents; and applying the electronic properties extracted from the first and second electronic documents to the content of the converted electronic document.