An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Web Standard: PDF Links


  • A PDF is a document in Adobe Portable Document Format (PDF); the filename extension is .pdf
  • The Drupal WebCMS adds the PDF link standard requirements (PDF disclaimer, PDF in the link, file size and number of pages after the link) automatically on the document page.
  • The EPA PDF linking standard applies to all PDF links including PDF links leaving the site. 

Content Requirements

  • When linking to PDFs, follow this format: <link>PDF Title (PDF)</link> (xx pp, yy K, About PDF)
  • Provide a link to EPA’s “About PDF” page ( ) on any Web page that links to PDFs. There are two ways to do this:
    • Use the PDF disclaimer box:
      • at the top of a page that includes many PDFs, right before a paragraph or list of PDFs, or 
      • immediately before the first reference to a PDF
    • Use the inline disclaimer when the long version is problematic, or where you have only a few PDFs linked
      • Format: inline disclaimer: <link>PDF Title (PDF)</link> (xx pp, yy K, About PDF)
  •  The "About PDF" link is only required once per page.
  • Include the title of the document and the acronym “PDF” in parentheses in the link text. Make sure it's a good descriptive title for the PDF you're linking to
  • After the link, show the PDF file information in parentheses, listing the number of pages and file size of the PDF as unlinked text, separated by commas.  (xx pp, yy K, About PDF)
    • For the number of pages, use "1 pg" for a single page. For multiple pages, use "XX pp" with a space between the number and "pp".
    • For file size, use "K" for files smaller than 1000 K and "MB" for files larger than 1000 K. For MB, use at most one decimal place. Put a space between the number and "K" or "MB."
    • You may code the file information in parentheses to appear in a smaller font by using the File Info disclaimer (class="fileinfo").
  • Do not add the file type of PDF, the file size, or the number of pages when linking to a document page.  The document page is not a PDF file.  


About this Standard

All EPA public web content must adhere to the EPA Web Standards, the U.S. Web Design System guidelines, and the 21st Century Integrated Digital Experience Act.

Original effective date: 07/12/2006
Last approved on: 06/10/2020
Web Council review by: 06/10/2023 (or earlier if deemed necessary by the Web Council)