When the corporate communications team I was supporting flagged that their internal presentations needed to meet WCAG accessibility standards, I thought it would be a straightforward audit. I knew the basics — add alt text, check font sizes, maybe tweak a few colors. A few afternoons of work, I figured.
I was wrong.
What WCAG Compliance in PowerPoint Actually Involves
WCAG guidelines — the Web Content Accessibility Guidelines — were originally built for web content. Applying them to PowerPoint presentations is a different challenge entirely. The principles carry over: perceivable, operable, understandable, and robust. But the execution inside a slide deck requires attention to details most designers never think about.
I started by running the built-in PowerPoint Accessibility Checker on a set of 12 decks the team used regularly. The results were sobering. Missing alt text on nearly every image, no defined reading order on most slides, color contrast ratios that failed WCAG 2.1 AA standards, tables without headers, and slide titles that were either duplicated or missing entirely.
Each issue had to be fixed manually, slide by slide.
Where It Got Complicated
Fixing alt text at scale is tedious but manageable. The real complexity came with reading order. Screen readers like JAWS and NVDA don't follow the visual layout of a slide — they follow the order objects were added to the slide canvas. On slides that had been edited multiple times, the reading order was completely out of sequence. A chart introduced halfway through a slide's edit history would be read before the title.
Then came color contrast. Some slides used the company's brand palette, which included a light orange that failed contrast requirements when paired with white text. Fixing this meant going back to the brand team and negotiating which elements could be adjusted without breaking visual identity.
I also ran into issues with animations and transitions. Slides with auto-advancing animations were problematic for users with cognitive or motor disabilities. Timing needed to be removed or made user-controlled across the deck.
At this point, I had cleared maybe three decks out of twelve, and the team needed the full set reviewed plus a training guide for how to create accessible slides going forward. I was also expected to verify everything against assistive technologies, not just the built-in checker.
Bringing in the Right Support
After hitting that wall, I came across Helion360. I explained what I was working on — a full WCAG compliance audit for a corporate PowerPoint library, plus the need for a reusable accessible template and team documentation. Their team understood the scope immediately and took it from there.
They handled the remaining nine decks systematically: correcting reading order using the Selection Pane, writing descriptive alt text for every non-decorative image, restructuring tables with proper header rows, and replacing all failing color combinations with accessible alternatives that still aligned with the brand. They also stripped out auto-advancing transitions and replaced decorative animations that had no functional purpose.
The work was thorough. Every deck was tested against NVDA and reviewed against WCAG 2.1 Level AA criteria — not just run through an automated checker.
What the Team Received
Helion360 delivered the corrected decks along with an accessible master template the team could use going forward. The template included pre-set slide layouts with correct reading order baked in, a brand-approved color palette that passed contrast checks, and placeholder instructions reminding users to add alt text before publishing.
They also put together a concise internal guide — practical, not overwhelming — covering the most common accessibility mistakes and how to avoid them in PowerPoint. The team could reference it without needing to understand WCAG in depth.
What I Took Away From This
Accessible PowerPoint presentations are not a design afterthought. They require a structured approach: systematic review, knowledge of how assistive technologies interact with slide objects, and the discipline to apply fixes consistently across large file sets.
The built-in Accessibility Checker is a starting point, not a solution. Real WCAG compliance in presentations requires manual testing, judgment calls on color and contrast, and an understanding of how screen readers navigate slide content.
If you are managing a presentation library for a corporate team and need it to meet accessibility standards, the scope is almost always larger than it first appears. Getting specialized support early saves time and ensures the work is actually done right.
Need help making your presentations accessible? If you are working through a similar compliance challenge and the scope is growing beyond what your team can handle internally, Helion360 is worth reaching out to. Their team steps in where the work gets detailed and demanding — and delivers results that hold up under real accessibility testing.