Mahendra - I don't get the reason for all the end manipulation of your pattern. GIMP will let you resize (but it's better to do that in Inkscape on the SVG), add your signature, and save as jpg, gif, or pdf (plus a bunch more). I've never had a GIMP gif pattern become too big to post to Steve's site (but sometimes a jpg might be, and a pdf often will be >128kB).