Dyslexia is a neurological learning difference that changes how the brain processes written language. It affects reading, spelling, and writing, and it’s one of the most common learning differences worldwide — yet it’s still one of the most misunderstood inside digital design. Dyslexia is not a vision impairment, and it isn’t a matter of intelligence or effort. It’s a difference in how the brain decodes the visual symbols that make up written text, which means the fix isn’t “read more carefully” — it’s designing content that doesn’t demand more decoding effort than necessary in the first place.
For someone with dyslexia, standard text can appear to blur, letters can seem to swap or reverse, and words can blend together on the page. That friction turns routine digital tasks — reading a policy page, filling out a form, completing a checkout flow — into something that takes noticeably more time and mental effort than it should. As more essential services move online, that gap has real consequences: a confusing form isn’t just an inconvenience, it can be the difference between a completed purchase and an abandoned one, or between understanding your rights and missing them. Designing with this in mind is a core part of cognitive accessibility, not an optional add-on to it.
What makes digital content hard to use for dyslexic readers
The difficulty isn’t limited to long blocks of unbroken text, although that’s part of it. A handful of specific, common design choices compound the problem in ways that are easy to miss if you’re not looking for them.
Justified text
Justifying text — forcing it to align evenly on both the left and right margins — sounds like it should look cleaner, but it comes at a cost. To make every line reach the margin, word spacing gets stretched unevenly, creating ragged gaps that run vertically down the page. These are sometimes called “rivers” of white space, and they do exactly what the name suggests: they pull the eye down through the gaps instead of across the line, breaking the left-to-right rhythm that reading depends on. For a reader who is already working harder to track where they are on the page, that’s an added obstacle, not a stylistic flourish.
High contrast
Very high color contrast — most commonly, pure black text on a stark white background — is usually framed as a universal accessibility win, since it helps readers with low vision. But for some dyslexic readers, that same high contrast can cause visual stress, a shimmering or “halo” effect around individual letters, or general eye strain that makes sustained reading uncomfortable. This is one of the places where accessibility isn’t one-size-fits-all: the same design choice that helps one group can create friction for another, which is part of why customizable display settings matter more than a single “correct” default.
Unpredictable navigation
Inconsistent page layouts, menus that behave differently from page to page, and unclear information architecture all add a layer of cognitive load before a reader even reaches the content they came for. For most users, this is a minor annoyance. For a dyslexic reader who is already spending extra mental effort decoding text, an unpredictable interface competes for the same limited attention, and it often loses that competition — meaning the reader disengages before they get to the actual information.
Dense, jargon-heavy writing
Long, multi-clause sentences and unnecessary technical vocabulary compound the core difficulty of dyslexia, which is decoding text itself. It’s not that dyslexic readers can’t understand complex ideas — it’s that every additional clause, every unfamiliar term, adds to the decoding workload on top of the meaning-making workload. Writing that’s dense in both ways at once is disproportionately harder to read for someone with dyslexia than for someone without it, even when the underlying content is the same.
Individually, each of these patterns is manageable. Stacked together on the same page — justified paragraphs, high contrast, inconsistent navigation, and jargon — they compound into a site that’s meaningfully harder to use for this group, and these same patterns show up across neurodivergent web design more broadly, not just for dyslexia specifically.
Design principles that support dyslexic users
Good design here overlaps heavily with cognitive accessibility as a whole: the same choices that help dyslexic readers tend to reduce cognitive load for other neurodivergent users too, and often improve the experience for everyone else on top of that.
Typography
Choosing dyslexia-friendly fonts starts with sans-serif options — Arial, Tahoma, and Verdana are the most commonly recommended — because they lack the decorative strokes, or serifs, that can make individual letters bleed together at normal reading sizes. Text should also stay left-aligned rather than justified, for the reasons already covered above: consistent word spacing preserves the reading rhythm that justified text disrupts. Font size and line height matter too — cramped lines with little space between them make it harder to track from the end of one line to the start of the next.
Content structure
Breaking information into short paragraphs, bulleted lists, and clear, descriptive headers does more than make a page look organized — it improves readability by giving dyslexic readers a way to process content in smaller, self-contained chunks instead of holding an entire dense paragraph in working memory at once. Clear headers also let a reader scan ahead and understand a page’s structure before committing to reading it in full, which reduces the anxiety of not knowing how much effort a page is going to demand.
Customizable viewing
Because the “right” contrast and color scheme varies from person to person, giving users control matters more than picking a single default. Toggles that let readers switch to softer backgrounds — pastels, off-whites, or a dark mode — reduce the visual glare that a fixed high-contrast theme can cause, without forcing a trade-off between accessibility for one group and comfort for another.
Supporting visuals
Icons, diagrams, and relevant images — each described with clear alt text so they’re also usable with assistive technology — give readers a second path into the same information instead of one that depends entirely on decoding text. This matters most at decision points: a checkout flow, a form with several steps, or instructions with a sequence, where a supporting visual can carry meaning that would otherwise rest entirely on written language.
Assistive technology and accommodations
Beyond how a site itself is built, many dyslexic users rely on tools that sit on top of a website to make it easier to read. Text-to-speech software converts on-screen text to audio, letting a reader listen to content instead of — or alongside — decoding it visually. Browser-level accessibility extensions can apply dyslexia-friendly fonts, adjust spacing, or change color schemes across any site a person visits, regardless of whether that site was built with those options in mind. These tools are a meaningful reasonable accommodation for the reader, but they work best as a supplement to good design, not a substitute for it — a site that’s already built with clear structure and readable typography puts far less strain on an assistive tool than one that isn’t.
Legal frameworks and WCAG’s role in compliance
Web Content Accessibility Guidelines (WCAG)
The Web Content Accessibility Guidelines (WCAG) translate broad legal requirements into specific, testable design parameters. Two success criteria are especially relevant to dyslexia: Success Criterion 1.4.12 (Text Spacing) sets minimum requirements for line height, paragraph spacing, letter spacing, and word spacing, so a reader who needs more room between lines or words can adjust it without losing content. Success Criterion 1.4.8 (Visual Presentation) goes further, covering line width, text justification, and the ability to select foreground and background colors — directly addressing several of the exact issues, like justified text and high contrast, that make content harder to read for dyslexic users. Worth noting: WCAG doesn’t mandate a specific font. Neither 1.4.8 nor any other success criterion requires a sans-serif typeface or bans a particular font family outright. What WCAG does constrain is the surrounding presentation — spacing, justification, resizability — which is exactly why font choice ends up mattering as much as it does in practice, even though “use a dyslexia-friendly font” is best-practice guidance layered on top of WCAG rather than a pass/fail criterion within it.
How WCAG shows up in legislation
WCAG itself isn’t a law — it’s a voluntary technical standard. But it’s the standard nearly every accessibility law in this space is built around, even though each one incorporates it differently: some name a specific WCAG conformance level directly in the regulation, others leave it to courts to treat WCAG as the operative benchmark. The frameworks most relevant to dyslexia and cognitive accessibility include:
- ADA Title II (state and local government): explicitly codifies WCAG 2.1 Level AA under the DOJ’s 2024 final rule, with compliance deadlines extended in 2026 to April 2027 for larger public entities and April 2028 for smaller ones.
- ADA Title III (private businesses): no equivalent DOJ rule exists, so courts instead treat WCAG 2.1 AA as the de facto benchmark for equal access at a place of public accommodation. Falling short there still leaves an organization exposed to digital accessibility lawsuits.
- Section 508 of the Rehabilitation Act: the 2017 “Refresh” explicitly incorporated WCAG 2.0 Level AA by reference, binding federal agencies, contractors, and federally funded organizations to it — an obligation that explicitly extends to learning disabilities like dyslexia, not just more commonly discussed categories like vision or hearing impairment.
- AODA: Ontario’s Integrated Accessibility Standards Regulation explicitly mandates WCAG 2.0 Level AA for public-facing websites, with only two narrow carve-outs — live captions and prerecorded audio description — that have nothing to do with cognitive accessibility.
W3C Cognitive Accessibility Guidance
Beyond WCAG’s testable criteria, the World Wide Web Consortium (W3C), through its Web Accessibility Initiative (WAI), has published a supplementary framework called “Making Content Usable for People with Cognitive and Learning Disabilities.” Unlike WCAG’s pass/fail success criteria, this document is more descriptive than testable — it lays out concrete design patterns for simplifying navigation, structuring content predictably, and reducing cognitive load, aimed specifically at the kind of learning and cognitive disabilities that WCAG’s existing criteria only partially address. It’s a useful reference for teams that want to go beyond minimum compliance toward genuinely thoughtful design for this group.
Meeting these standards helps organizations mitigate legal risk while making their platforms usable for a broader, more diverse audience.
