A device for assembling and sorting a print substrate, having - a printed-image testing device, which is arranged on one side of a print substrate which is printed with a printed image, the print substrate being a web material, which can be displaced along a web path, having an image recording device, the printed-image testing device being set up - to record an image of the printed image on the print substrate by means of the image recording device, - to compare the printed image on the print substrate with comparison data, the comparison of the printed image with the comparison data comprising the comparison of the recorded image of the printed image with comparison image data, - to determine the printed image as a correct printed image for a sheet (29, 30) to be separated from the print substrate if a match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data, and - to determine the printed image as a incorrect printed image for a sheet (29, 30) to be separated from the print substrate if no match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data; - an assembly device, which is arranged along the web path downstream of the printed-image testing device and is set up to separate a printed sheet (29, 30) from the print substrate; - a first tensioning device, which is arranged along the web path downstream of the printed-image testing device and upstream of the assembly device and is set up to set a mechanical web tension of the print substrate; and - a document diverter, which is set up to direct the printed sheet (29, 30) onto one of a first transport path and a second transport path; - the document diverter being set up to direct the printed sheet onto the first transport path if the printed image on the printed sheet is determined as a correct printed image, and - the document diverter being set up to direct the printed sheet onto the second transport path if the printed image on the printed sheet is determined as an incorrect printed image. - a printed-image testing device, which is arranged on one side of a print substrate which is printed with a printed image, the print substrate being a web material, which can be displaced along a web path, having an image recording device, the printed-image testing device being set up - to record an image of the printed image on the print substrate by means of the image recording device, - to compare the printed image on the print substrate with comparison data, the comparison of the printed image with the comparison data comprising the comparison of the recorded image of the printed image with comparison image data, - to determine the printed image as a correct printed image for a sheet (29, 30) to be separated from the print substrate if a match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data, and - to determine the printed image as a incorrect printed image for a sheet (29, 30) to be separated from the print substrate if no match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data; - to record an image of the printed image on the print substrate by means of the image recording device, - to compare the printed image on the print substrate with comparison data, the comparison of the printed image with the comparison data comprising the comparison of the recorded image of the printed image with comparison image data, - to determine the printed image as a correct printed image for a sheet (29, 30) to be separated from the print substrate if a match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data, and - to determine the printed image as a incorrect printed image for a sheet (29, 30) to be separated from the print substrate if no match is determined between the printed image and the comparison data on the basis of the comparison of the printed image on the print substrate with the comparison data; - an assembly device, which is arranged along the web path downstream of the printed-image testing device and is set up to separate a printed sheet (29, 30) from the print substrate; - a first tensioning device, which is arranged along the web path downstream of the printed-image testing device and upstream of the assembly device and is set up to set a mechanical web tension of the print substrate; and - a document diverter, which is set up to direct the printed sheet (29, 30) onto one of a first transport path and a second transport path; - the document diverter being set up to direct the printed sheet onto the first transport path if the printed image on the printed sheet is determined as a correct printed image, and - the document diverter being set up to direct the printed sheet onto the second transport path if the printed image on the printed sheet is determined as an incorrect printed image.