i dnt knw hw to use pc to do it. I applied wit my fone. If ur usn a gd and big nokia fone, u kan compress wit ur fone! Open gallery, go to image and video, select d certificate(dats if u hv it in ur fone,i hv mine),click option, u wil c shrink, click it and it reduce d size to mayb 20kb or so. Ds is 4 ppl usn a gd nokia symbian fone!