In a situation where you only know a Pardot landing page’s public URL, and you want to open it for editing, here is what you do:

  1. Go to the landing page in your browser (works for forms, too)
  2. add the parameter ?PI_DEBUG_ENABLE=1 to the end of the URL. So
    https://pardotdomain.yoursite.com/short_url
    will become
    https://pardotdomain.yoursite.com/short_url?PI_DEBUG_ENABLE=1
  3. Hit Enter to go to this new URL
  4. A direct link to the Pardot asset will appear on the upper right of the page. Click it to start editing your page/form right away:

Credits

Credit for this goes to Cheshire Impact’s post on editing live Pardot pages. As far as I can tell, this is a completely undocumented server-side function.