PDFtoPNG is a standalone win32 program that can convert PDF to PNG image directly and doesn't requires Adobe Acrobat and other library. it supports convert PDF to PNG image wih different dpi.
Feature
PDF to PNG supports Batch process mode, You can convert a hundred of PDF document at one time.
Fast speed
PDF to PNG supports English, French, German, Italian,chinese,Janpanese and other language PDF files.
PDF to PNG supports CIDFont and Type1,Type 3,TrueType font and embedded fonts.
PDF to PNG supports all Windows platforms, 95/98/ME/NT/2000/XP
PDF to PNG supports export PNG image with 72-800 dpi.
PDF to PNG supports PDF 1.6 (formerly only supported by Acrobat 7.0)
PDF to PNG supports run from command line.