A document processing apparatus includes an acquiring unit and an output unit. The acquiring unit acquires first document data containing page image data corresponding to pages of a document. Each page of the document has a first end and a second end opposite to the first end. The output unit outputs second document data in which an order or a direction of the page image data is changed, when the first document data contains first page image data indicating that an image is drawn in a first area corresponding to the first end of at least one of the pages of the document and second page image data indicating that an image is drawn in a second area corresponding to the second end of at least one of the pages of the document and when page numbers of the first and second page image data have a predetermined relationship.