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You are here: Home / Website Accessibility / Accessible PDFs: Everything You Need To Know

Accessible PDFs: Everything You Need To Know

Author:
Meg Miller
6 minutes

A person using accessibility device to access a website.

What’s an accessible PDF (Portable Document Format)? What does that even mean? This post will answer those questions and supply you with tips on making your PDFs accessible and things to look out for.

What is an Accessible PDF?

Accessible PDFs are simply PDFs that have been optimized for usability for those who may have a disability. Such optimizations also include taking proper formatting semantics into account. For a PDF to be considered accessible, it must meet a particular set of standards:

  1. Searchable text
  2. Use of text instead of images of text
  3. Alt-text descriptions for non-text elements (images, videos, etc.)
  4. Labeled and interactive form fields with accessible error messages that don’t time out
  5. Document language and title are indicated on the PDF and match the language the document was written in
  6. Document structure tags and proper reading order
  7. High contrast between background and text/images 
  8. The document security doesn’t interfere with assistive technology
  9. Consistent navigation and identification of elements
  10. Color or sensory characteristics aren’t used to convey meanings
  11. Interactive hyperlinks and navigational aids
  12. Controls for audio
  13. No use of flashing or blinking elements
  14. No focus changes without user initiation

The Americans with Disabilities Act (ADA) requires that businesses be accessible to everyone. Currently, the courts have extended the ADA requirement to websites also. Therefore, if you have any PDFs on your website, they must be accessible too. 

An accessible PDF complies with the law and provides a painless experience for people who might otherwise struggle to use your document. You’re at risk of getting sued or losing potential customers if they can’t understand your content.

Why does a PDF need to be Accessible?

PDFs are a great way to package information and make it sendable, downloadable, printable, or attachable. However, not everyone is able to visually scan a document, distinguish color combinations with poor contrast, or make cognitive assumptions. Here are some examples of why some people need PDFs to be accessible:

  • Those who are blind or have low vision use a screen reader to read content for them. If a PDF doesn’t have correct formatting, this makes it much harder to do (or even impossible in cases of a scanned PDF)
  • For those who have motor impairments and can’t use a mouse, they will use their keyboard to navigate a PDF. To optimize navigation, formatting and correct semantics are key (for example, a form PDF should have formatted, fillable fields)
  • Those with cognitive disabilities may struggle to read text that is hyperstylized or a low-resolution scanned document

How to Make an Accessible PDF

While you may have hoped for a simple fix, creating an accessible PDF is more than clicking a few buttons. There are a whole set of procedures and processes you’ll want to follow to guarantee you’re creating an accessible PDF. We’ve listed step-by-step instructions to help with this process.

Format the Original Document Correctly

If you’re creating a PDF from a word processing program, make sure your original document is formatted correctly. Organize your content systematically, and the navigation should be uncomplicated for anyone who views your content. This can mean using correct headings, list formatting, paragraph spacing, and implementing bookmark anchor links when making references within the same document. Making sure your original document is formatted correctly will reduce the chance of having to make corrections within your PDF editor.

Tags 

Not to be confused with digital keywords, screen readers use document tags to identify document elements for its users and create a roadmap. Check to confirm headings, tables, paragraphs, and images are all labeled properly before converting your document. One of the most important parts of creating an accessible PDF is to guarantee that you’re using the right tags. They not only let your users know what information is important (like a heading), but they also allow you to instruct some information to be ignored by screen readers (such as a 100% decorative element in an infograph).

Structure

Format your content in a way that makes sense to all readers; don’t assume they’ll all be able to come to the same conclusion. Making your users guess is a quick way to frustrate them. This means creating intuitive and consistent structures, sorting content with proper headings, and not depending on your users consuming the document in one way.

Title

The document title should describe the content. For example, if you have an article about rugs, you wouldn’t name it “My Favorite Things.” Instead, consider a name like “The Best Rugs for Allergy Prone Households.”

Links

For links to be accessible, they must have descriptive anchor text (eg, “link text”), rather than generic terms like “click here.” If you’re linking to a blog post, use the blog post title instead of a “Read More” link.

Images

Images should include a caption or alt text (preferably not both unless they offer different information). The caption and alt text give the reader more information about the image, even if they can’t see it. This creates context for your users.

Reading Order

Manually configuring a reading order within your PDF is the only way to make sure your PDFs are correctly presented. While a standard document created in a word processor will probably have a default linear reading order, this gets a little more complicated when you start considering an infograph designed in Adobe Illustrator or a flyer designed in Microsoft Publisher.

Context

Context and wording can make a huge impact on your users. For example, giving a relative instruction like “at the top of this page” is only useful for sighted users. Create content that is more specific and reduces your user’s guesswork.

Scanned PDFs are not Accessible

Scanning a physical document as a PDF is never accessible. Screen readers can’t detect the text since it is technically an image in these types of documents, optical character recognition (OCR) doesn’t add the correct headings and tags, and they’re almost always at a slight tilt and scanned text is usually grainy and hard to read. This practice should be 100% avoided.

Conclusion

Every time you make a PDF, it’s important to make sure all content is accessible to everyone, regardless of ability. By following these steps, you’ll create documents that everyone can use.


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Author:
Meg Miller
6 minutes

Categories: Website Accessibility

About the author

Meg Miller

Meg Miller

Meg discovered a love for web development at a young age and has worked on everything from websites to indie games. Since joining the agency in 2015, she’s also found a passion for universal access websites and accessible design.

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Comments

  1. Andy

    April 26, 2022 at 3:46 am

    Hi Meg.

    Thanks for this important article! With your explanations, there are no more excuses for inaccessible PDFs (:

    I’m currently wondering about the success criterium [1.4.10 Reflow](https://www.w3.org/WAI/WCAG21/Understanding/reflow.html), as the european industry norm EN 301 459 requires it for Non-web documents like PDF as well – which makes sense.

    Above linked article mentions the following:

    > PDF offering reflow
    > In a PDF created to conform to PDF/Universal Accessibility (ISO 14289), the content can be reflowed and zoomed in to make reading possible for someone with low-vision.

    Would you have more insights on this topic? Thanks!

    Reply
    • Meg Miller

      April 28, 2022 at 9:51 am

      Hi Andy!

      Reflowing allows content to wrap and be readable when it is zoomed in (either on a webpage or a PDF).

      To reflow a PDF in Adobe Acrobat, you can either press “ctrl+4” or click “View” in the toolbar, navigate to “Zoom” from the drop-down and click “Reflow” from that drop-down. It will temporarily re-format a PDF into a single-column view and remove artifacts and unnecessary elements.

      If a PDF hasn’t been tagged or established a reading order, this reflow will be generated by default and probably a bit out of sorts and the content will be organized by default top-to-bottom and left-to-right in the order it occurs in the document. While this won’t be a huge issue for a standard text-only document, a document with more complex elements (such as images or columns) could be quite confusing if the document doesn’t know which order the elements appear in.

      However, if a logical reading order has been established, it will re-organize the content in that manual reading order instead of an automatically generated reading order so you may ensure those who require Reflow will still consume the information in an order that makes sense.

      I hope that helps!

      Reply

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