Resize PDF A4 to letter

After a lot of searching on the interwebs I finally found a simple and reliable way to do this seemingly simple task.

• Install pdfjam (this example is for Debian/Ubuntu)
  apt-get install pdfjam
• Resize PDF page (insert your own filenames)
  pdfjoin infilename.pdf --paper letterpaper --fitpaper false --outfile outfilename.pdf