Image to pdf: how to resize to A4

I developed a program in vb6 to convert various files (doc, txt, pdf, jpg, bmp ...) in a single pdf file.
Everything works except that the images are not resized: so I have a pdf file with pages of magnitude different from each other. How can I resize a jpg image to A4?

thanks

Hi,

 

resizing images is not possible with PDFCreator.

 

regards,

 

Robin