How to Make Your Presentations Accessible to Everyone

Direct answer: To make your presentations accessible, follow six core practices: use at least 4.5:1 color contrast ratio for text, set minimum 18pt body font size, add descriptive alt text to every meaningful image, never rely on color alone to convey meaning (add labels, patterns, or icons), maintain a clear heading hierarchy for screen reader navigation, and describe visual content verbally when presenting live. These practices benefit everyone—not just people with disabilities—because they improve clarity, readability, and comprehension for all viewers.

Making presentations accessible ensures that people with visual, hearing, cognitive, or motor differences can follow and benefit from your content. But accessible design is not just a compliance checkbox—it is better design, period. Sufficient contrast, readable fonts, clear structure, and well-described visuals improve comprehension for every audience member, whether they are in the front row of a conference hall, watching on a small laptop screen, or reviewing a shared deck on their phone.

This guide covers practical, implementable steps across color, typography, structure, media, and delivery that make your next presentation inclusive by default.

Why Accessibility Matters for Presentations

The Scale of the Need

Approximately 1 in 4 adults in the United States lives with some form of disability. In any audience of 20 people, 5 are statistically likely to have a condition that affects how they consume visual content:

Beyond disability, accessible design helps people in non-ideal viewing conditions: dim conference rooms, small laptop screens, participants viewing on mobile, non-native language speakers, and anyone multitasking during a virtual meeting.

Legal and Organizational Requirements

Many organizations are required to produce accessible content under laws including the ADA (United States), the Equality Act (UK), and AODA (Canada). Federal agencies and their contractors must meet Section 508 standards. Universities receiving federal funding must comply with ADA requirements. Even if your organization is not legally required, accessibility increasingly reflects professional standards and organizational values.

Color and Contrast

Ensuring Sufficient Contrast

Contrast ratio measures the luminance difference between text and its background. Higher ratios mean better readability.

How to check: Use WebAIM's free Contrast Checker. Enter your text color and background color, and it instantly reports the ratio and whether it passes each standard.

Common failing combinations to avoid:

• Light gray text on white background (common in "modern minimalist" designs)
• Yellow or orange text on white background
• Red text on green background (or vice versa)
• Blue text on dark blue background
• Any text on a busy photographic background without a solid overlay

Designing for Color Vision Deficiency

Approximately 300 million people worldwide have color vision deficiency (commonly called "colorblindness"). The most common type is red-green deficiency, which means red and green look similar.

Rule: Never use color as the sole means of conveying information.

For charts and graphs:

• Add direct labels to data series instead of relying on a color legend
• Use patterns (hatching, dots, stripes) in addition to colors for bar charts
• Choose a colorblind-safe palette: blue/orange, blue/red, purple/green work better than red/green

Typography and Readability

Font Size Standards for Presentations

Presentation font sizes need to be significantly larger than document font sizes because slides are viewed at a distance (projected), on shared screens, or on small laptop windows.

Testing method: Share your screen in a video call and ask someone on a 13" laptop if they can read all text comfortably. If not, increase sizes.

Font Choice for Readability

• Sans-serif fonts (Arial, Helvetica, Verdana, Inter, Open Sans) are generally easier to read at small sizes on screens
• Avoid decorative, condensed, or light-weight fonts — they reduce readability for people with low vision
• Avoid ALL CAPS for body text — harder to read because words lose their shape (ascenders and descenders help word recognition)
• Bold for emphasis is preferable to italics, which are harder to read for many people including those with dyslexia
• Line spacing of 1.2-1.5 improves readability for everyone but especially for people with cognitive or visual processing differences

Text in Images

Avoid embedding text inside images whenever possible. Text in images cannot be:

• Resized by the viewer
• Read by screen readers
• Selected or searched
• Translated by browser tools

If you must use an image containing text (a screenshot, infographic, or diagram), include all text content in the alt description.

Images and Graphics

Writing Effective Alt Text

Alt text (alternative text) describes image content for screen reader users and for situations where images do not load. Every meaningful image needs alt text.

Three categories of images:

Alt text for charts and data visualizations:

Charts are the most commonly under-described images in presentations. For each chart, the alt text should include:

1. Chart type (bar chart, line graph, etc.)
2. What it measures (revenue, users, growth)
3. Key data points and the main insight
4. Time period and source

Example: "Line chart showing monthly recurring revenue from January to December 2025. MRR grew from $1.2M to $4.2M, with the steepest growth in Q4 after the enterprise tier launch. Source: internal billing system."

Avoiding Flashing and Rapid Motion

Content that flashes more than 3 times per second can trigger seizures in people with photosensitive epilepsy. This applies to:

• Animated GIFs with rapid flashing
• Video content with strobe effects
• Slide transitions with rapid light/dark alternation

Rule: Avoid all flashing content. Use subtle fade transitions or no transitions at all.

Structure and Logical Order

Heading Hierarchy

Screen readers and keyboard navigation tools rely on heading levels to navigate slide content. Maintain a clear hierarchy:

• H1: Slide title (one per slide)
• H2: Section headings within a slide
• H3: Sub-sections if needed

Do not skip heading levels (going from H1 to H3 without H2) and do not use heading formatting just for visual emphasis—use bold text instead.

Reading Order

Screen readers follow the element order defined in the slide structure, not the visual position on screen. Complex overlapping layouts where elements are visually arranged in one order but structurally defined in another create a confusing experience for screen reader users.

Best practice: Keep layouts simple. Left-to-right, top-to-bottom arrangement of elements. Avoid text boxes that overlap or complex multi-column layouts that break reading flow.

Lists and Tables

Use proper list and table markup rather than manually formatted text with dashes or tabs. Assistive technology announces list items ("Item 1 of 5") and table headers, which helps users understand structure and navigate content.

For tables, always include header rows and keep the table structure simple (avoid merged cells when possible).

Delivery and Live Presentation Practices

Accessible design extends beyond the slides themselves to how you present them.

Verbal Description of Visual Content

When presenting live, describe charts, images, and visual elements:

• "This chart shows revenue growing from $1.2M to $4.2M over the past year, with the steepest growth in Q4."
• "The screenshot on screen shows our dashboard with three main panels: pipeline overview, activity feed, and revenue tracker."

This helps attendees who cannot see the screen clearly—whether due to vision differences, poor projector quality, or viewing on a small mobile screen.

Captions for Virtual Presentations

Enable live captions whenever possible for virtual presentations. Most major platforms (Zoom, Microsoft Teams, Google Meet) now offer automatic captioning. For important presentations, consider human-generated captions (CART services) for higher accuracy.

Share Materials in Advance

Share the deck 24-48 hours before the presentation so attendees can:

• Review at their own pace using assistive technology
• Adjust font sizes or contrast in their own viewer
• Prepare questions based on the content
• Follow along during the live presentation

Pacing

Allow time for processing between slides. A 2-3 second pause when advancing slides gives attendees time to read the new content before you begin speaking about it. This is especially important for attendees using screen readers or those processing in a second language.

Accessibility Checklist

Use this checklist before every presentation:

Getting Started

Accessibility is a practice, not a one-time fix. Build these habits into your workflow from the start, and they become automatic. The result is presentations that work better for everyone—not just people with disabilities.

Use the SlideMate editor to create accessible presentations with clear structure, readable typography, and professional design. Browse our templates for layouts built with accessibility in mind.

For more presentation guides, visit our blog for engaging slide design, data visualization, and training materials.

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