Abstract: A computerized method of comparing documents includes a computing device: receiving a source document via a first automated document feed channel; receiving a target document via a second automated document feed channel; pre-processing the source document using a first comparison data structure operating on the computing device, thereby producing a pre-processed source document having a text array including text from the source document; pre-processing the target document using a second comparison data structure, thereby producing a pre-processed target document having a text array including text from the target document; determining, using a document comparison engine operating on the computing device, a set of differences between the pre-processed source document and the pre-processed target document with respect to a set of pre-specified criteria; and generating, a summary of the set of differences between the pre-processed source document and the pre-processed target document.