title: Is it possible to edit/add PDF tags without adobe reader?
body: <p>Adobe Acrobat Pro allows you to modify your PDF documents tags (add HTML h1, h2, p, list tags, etc) through the software. There are also PDF accessibility add-ons for Adobe Acrobat such as CommonLook, but from what I can see these are just add-ons and there is nothing out there that operates completely independently from the Acrobat application.</p>
  <p>Basically, I'm wondering if it would be possible to create a custom web application in PHP to modify these accessibility tags completely separate from any adobe application. With enough knowledge of the PDF document structure would this be doable?</p>
  <p>You can see what I'm referring to by PDF tags here:
  <a href="https://www.hhs.gov/sites/default/files/pdf-tagging.pdf" rel="nofollow noreferrer">https://www.hhs.gov/sites/default/files/pdf-tagging.pdf</a></p>