Why are PDFs Still So Inaccessible?
Higher education has made significant progress in digital accessibility to align with WCAG standards. However, PDFs remain one of the most persistent barriers, not only because of how widely they are used across LMS courses, administrative workflows, departmental repositories, and library resources, but because the format itself presents unique accessibility challenges.
The challenge exists on two levels. Technically, PDFs lack the structural information assistive technologies need to interpret content accurately. Operationally, institutions must manage millions of these documents across decentralized systems that were never designed for continuous accessibility oversight.
And with the April 2027 ADA Title II compliance deadline on the horizon, the urgency to tackle PDF accessibility is now greater than ever.
The PDF accessibility problem lies in the structure
PDFs are so ubiquitous that accessibility is often not considered at the point of creation. Faculty create course materials in Word or PowerPoints and export them as PDFs to preserve formatting. They rely on PDFs for syllabi, forms, policy documents, and more because they are stable, portable, and easy to distribute across systems.
However, faculty is far from the only source. Courses also rely heavily on publisher-provided journal articles, scanned book chapters, library resources, historical documents, and administrative forms—many of which arrive as PDFs long before instructors upload them to the LMS. Regardless of where they originate, PDFs are so widely used because they preserve formatting and are easy to distribute across institutional systems.
The issue is distribution of responsibility across a system that was built for speed and autonomy.
A PDF can look clean, readable, and professionally designed, but that does not mean it’s accessible. This applies not only to scanned documents but also to PDFs created from digital sources files, including publisher-provided journal articles. Even scholarly PDFs produced by academic publishers frequently lack the structural markup required for assistive technologies, demonstrating that visual quality and professional production are not reliable indicators of accessibility.
Scanned PDFs introduce an additional layer of complexity because they often contain no machine-readable text at all. Rather than containing selectable text, these documents are essentially images of printed pages. Before they can be remediated, the text must first be accurately extracted through optical character recognition (OCR). If the OCR process introduces errors or fails to recognize complex layouts, accessibility work becomes significantly more difficult before structural remediation can even begin.
Accessibility depends on structural elements that are not visible in the layout itself, including tagged headings, logical reading order, semantic navigation, properly tagged tables, alternative text for images, and document metadata. These elements allow assistive technologies to interpret and navigate a document as intended.
These structural requirements are defined by PDF/UA (ISO 14289), the international standard for accessible PDFs. While WCAG 2 establishes broad accessibility principles for digital content, PDF/UA applies those principles specifically to PDF files by defining how documents should be structured so assistive technologies can reliably interpret them. Institutions can verify PDF/UA conformance using PAC (PDF Accessibility Checker), the industry-standard tool used to test structural compliance on a file-by-file basis. This gives accessibility teams objective, third-party evidence of conformance, rather than relying on visual review or vendor assurances alone.
When those principles are missing or incorrectly applied, screen readers may present content in a fragmented or confusing sequence. In some cases, the content is reduced to untagged text or images with no readable hierarchy. Academic documents introduce additional complexity because they frequently contain tables, charts, diagrams, mathematical notation, and multi-column layouts—all of which require careful structural tagging to remain understandable for assistive technologies.
The disconnect between visual design and underlying structure is one of the most consistent issues identified in institutional accessibility guidance. It is also one of the least visible to content creators who assume that visual readability implies accessibility.
Scale is a Systemic Challenge
PDFs exist across nearly every digital environment on campus. They appear on public websites, shared drives, library repositories, administrative systems, and perhaps most significantly, inside LMS environments.
While institutions must address accessibility everywhere, LMS present a particularly difficult operational challenge. Faculty-uploaded course materials are decentralized, continuously changing, and often invisible outside individual courses. This makes them much harder to inventory and remediate than centrally managed web content because a single course may contain hundreds of PDFs, and an institution may operate thousands of courses each term.
That scale introduces a compounding effect. Content is continuously added, reused, and modified, often without centralized tracking. Over time, inaccessible files accumulate faster than they can be reviewed.
This is where institutional experience begins to diverge from intent. Even well-resourced teams encounter structural limits. The constraint comes in the mismatch between distributed content creation and centralized remediation expectations.
PDF remediation requires direct intervention at the file level. Each document must be evaluated, tagged, and structurally corrected. In some cases, source files must be reconstructed before remediation can even begin.
Institutions should also be cautious about solutions that promise accessibility simply by generating alternative formats of inaccessible PDFs. While an HTML or text version may improve access in some situations, it does not remediate the original document itself. If the inaccessible PDF remains in circulation, the underlying accessibility issue, and the associated compliance risk, still exists.
The effort required varies significantly. A simple exported syllabus may be straightforward to fix. A scanned journal article or heavily designed lecture deck may require extensive manual work, and that variability creates uneven workload distribution across accessibility teams. High-effort files consume disproportionate time, while lower-visibility issues remain unresolved.
The Lifecycle Problem Inside LMS Environments
Once PDFs enter an LMS, they tend to stabilize, not evolve. Unlike web content, they are not centrally updated—they are duplicated across courses, reused across terms, and stored in multiple locations without synchronization.
When an accessibility issue is identified, remediation requires locating every instance, updating the file, and ensuring replacements propagate correctly across instructional environments. That requirement makes institutional visibility difficult to maintain.
Most colleges and universities struggle to truly understand the scope. Without a complete inventory of PDFs across LMS environments, it is difficult to determine what exists, where it is used, and which files carry the greatest instructional impact.
With such a knowledge gap, workflows become reactive and driven by audits, student reports, or isolated issues, when the goal is continuous monitoring.
Rethinking PDFs as Part of Instructional Infrastructure
PDFs are central to how institutions store and deliver materials, including instruction is delivered in LMS environments. That makes their accessibility a direct factor in student access. As ubiquitous as PDFs are, the accessibility challenges that they present have caused some to argue that PDFs should simply not be allowed – but replaced by better alternatives.
Unlike PDFs, HTML content is inherently structured. Headings, lists, links, and other page elements are built using semantic markup that assistive technologies can interpret more reliably. Because HTML is also easier to update centrally, institutions can make accessibility improvements once and have those changes reflected wherever the content is published, rather than tracking down multiple copies of the same documents across courses and departments.
Keeping content in its original format can offer similar advantages. When accessibility issues are identified, editing the source file in Word or PowerPoint is typically faster and more efficient than remediating an exported PDF. Once the source document is accessible, future exports are far more likely to retain that accessible structure, reducing duplicate remediation work over time.
It’s hard to imagine PDFs going away overnight. Many publisher materials are only available in PDF format. The goal is to reserve PDFs for situations where they are the most appropriate format while designing new content in ways that reduce future accessibility burdens.
Thinking about accessibility at the point of creation shifts the conversation from remediation to prevention. Every document that begins in an accessible format is one less file that requires manual repair later, allowing accessibility teams to spend more time addressing complex cases.
How To Move Toward Scalable Accessibility Operations
Addressing PDF accessibility at institutional scale requires sustained visibility into where inaccessible files exist and how they are being used across learning environments. Institutions moving in this direction are increasingly combining structured workflows with automation and AI-assisted systems to manage scale. The goal is to maintain continuous oversight of PDFs as content evolves.
AristAI is here to support this operational shift. The AI Accessibility Suite focuses specifically on institutional document environments, where PDFs, slide decks, and instructional files can be scanned in bulk, analyzed for structural accessibility issues, and remediated into compliant formats without requiring manual reconstruction for each file. Every remediated file is tested against PAC to confirm PDF/UA conformance, giving institutions verifiable proof of accessibility rather than a visual pass/fail judgment. The system is designed to integrate into LMS workflows, allowing institutions to process content where it already lives rather than exporting it into separate remediation pipelines.
With AI-assisted systems, remediation is no longer a downstream correction process but part of how content is maintained over time.
The Takeaway
PDFs remain one of higher education’s greatest accessibility challenges because they were never designed to manage millions of documents through manual remediation alone.
As the April 2027 ADA Title II deadline approaches, success will depend on building sustainable accessibility operations that can keep pace with tomorrow’s content. That means creating visibility across LMS environments, improving document creation practices upstream, and using AI to continuously identify, remediate, and monitor inaccessible files at scale.
The institutions that make the greatest progress will be those who build systems capable of making accessibility part of everyday academic operations.
Want to create fully accessible course materials in minutes, not hours? AristAI makes your PDFs compliant with ADA Title II so every student can engage with your content from day one. Request a demo today.
Or try AristAI’s PDF remediation tool yourself for free!
Sources
Usability and Accessibility Issues with PDFs | University of Wisconsin-Madison
Understanding PDF Accessibility | University of Colorado Boulder
Tag, You're It!: A No-Nonsense Guide to PDF Accessibility in Higher Ed
The Problem with PDFs: It’s an Accessibility Thing
12 Common PDF Accessibility Mistakes and How to Fix Them | ADA Site Compliance
- ISO 14289-1 | PDF Association