A system for verifying an electronic document (110, 410), comprising - a first device (120, 420) comprising a first display (121, 421), a first interface (122, 422) and a first displaying program (123, 423) for displaying the electronic document (110, 410) on the first display (121, 421), - a second device (130, 430) comprising a second display (131, 431), a second interface (132, 432) and a second displaying program (133, 433), wherein the size of the second display (131, 431) is smaller than the size of the first display (121, 421) and wherein the second device (130, 430) comprises a signature-function for executing an electronic signature on the electronic document (110, 410), - a communication channel (140, 440) between the first interface (122, 422) and the second interface (132, 432), wherein the first (120, 420) and the second device (130, 430) are operable to exchange the electronic document (110, 410) and, wherein the first displaying program comprises a selection function, the selection function being operable to - select a part (115, 415, 201, 501) of the electronic document (110, 410), - generate position information of the selected part (115, 415, 201, 501) of the electronic document (110, 410), - send the position information to the second device (130, 430), wherein the second displaying program (133, 433) is operable to - lock the electronic document (110, 410) after the exchange with the first device (120, 420), - display the selected part (115, 415, 201, 501) of the electronic document (110, 410) on the second display (131, 431) based on the position information and on the locked electronic document (111, 412), wherein the signature-function is operable to - execute an electronic signature on the electronic document (110, 410) if the user indicates verification of the electronic document (110, 410), - reject the execution of an electronic signature if the user denies verification of the electronic document (110, 410). - a first device (120, 420) comprising a first display (121, 421), a first interface (122, 422) and a first displaying program (123, 423) for displaying the electronic document (110, 410) on the first display (121, 421), - a second device (130, 430) comprising a second display (131, 431), a second interface (132, 432) and a second displaying program (133, 433), wherein the size of the second display (131, 431) is smaller than the size of the first display (121, 421) and wherein the second device (130, 430) comprises a signature-function for executing an electronic signature on the electronic document (110, 410), - a communication channel (140, 440) between the first interface (122, 422) and the second interface (132, 432), wherein the first (120, 420) and the second device (130, 430) are operable to exchange the electronic document (110, 410) and, wherein the first displaying program comprises a selection function, the selection function being operable to - select a part (115, 415, 201, 501) of the electronic document (110, 410), - generate position information of the selected part (115, 415, 201, 501) of the electronic document (110, 410), - send the position information to the second device (130, 430), - lock the electronic document (110, 410) after the exchange with the first device (120, 420), - display the selected part (115, 415, 201, 501) of the electronic document (110, 410) on the second display (131, 431) based on the position information and on the locked electronic document (111, 412), - execute an electronic signature on the electronic document (110, 410) if the user indicates verification of the electronic document (110, 410), - reject the execution of an electronic signature if the user denies verification of the electronic document (110, 410).