Instrumental seismology started more than one hundred years ago and in Iran with the establishment of the Institute of Geophysics, University of Tehran in 1958. A large part of the earthquakes recorded during this period were carried out by analog instruments. Analog seismograms contain important earthquakes data and other valuable seismic information. Digitization of analog seismographs is essential for researchers to use new seismological techniques for older earthquakes, seismic hazard studies of regions and obtaining the seismic parameters of important earthquakes. In this study, by presenting a Scalable Vector Graphics (SVG) algorithm, some analog seismographs of Geophysical Institute of Tehran University have been digitized.