What is a Dyslexia-Friendly Font? A Complete Guide

Why fonts matter for dyslexia

Dyslexia is a neurological condition that affects how the brain processes written language. People with dyslexia often experience letter reversals (confusing “b” and “d”), letter rotations (“p” and “q”), and visual crowding — where letters seem to blur together.

Standard typefaces like Times New Roman or Arial were designed for typographic elegance, not cognitive accessibility. Dyslexia-friendly fonts address specific visual processing challenges by modifying letterforms to prevent confusion.

Key features of dyslexia-friendly fonts

1. Weighted bottoms (bottom-heavy letterforms)

OpenDyslexic is the most famous example: each letter has a heavier weight at the bottom. This “anchors” letters visually and prevents them from appearing to rotate or flip — a major source of reading errors for dyslexic readers.

2. Open counters and distinct letterforms

The “counter” is the enclosed or partially enclosed space in letters like “a,” “e,” “o,” and “c.” Fonts with open, generous counters are easier to distinguish. Lexend and Atkinson Hyperlegible both excel here.

3. Increased letter spacing (tracking)

Research from the University of Padua found that wider letter spacing significantly improved reading speed in dyslexic children. Many dyslexia-friendly fonts have generous default spacing, reducing the crowding effect.

4. No mirrored letterforms

In many traditional fonts, “b,” “d,” “p,” and “q” are simply mirrored versions of each other. Dyslexia-friendly fonts give each letter a unique, asymmetric shape that cannot be confused with its mirror image.

5. Avoided decorative elements

Serifs (the small decorative strokes at the ends of letterforms) can visually merge letters together. Most dyslexia-friendly fonts are sans-serif or use minimal decorative elements.

OpenDyslexic: the pioneering dyslexia font

Created by Abelardo Gonzalez, OpenDyslexic is the most recognized dyslexia-specific font. Its heavy bottom weighting was designed to prevent letter rotation. While research results are mixed — some studies show significant improvement, others show modest effects — user reports are overwhelmingly positive. Many dyslexic readers say it’s the first font that makes reading feel effortless.

OpenDyslexic is free and open source, making it ideal for schools, NGOs, and personal use.

Lexend: the evidence-based choice

Lexend was developed by Thomas Jockin in collaboration with reading proficiency specialist Bonnie Shaver-Troup. It’s based on research into how letter spacing affects reading fluency. Lexend comes in multiple weights (Lexend Deca, Lexend Exa, etc.) and is available on Google Fonts — making it easy to use in documents and web apps.

Google Fonts integrated Lexend based on its strong evidence base for improving reading performance across all readers, not just those with dyslexia.

Atkinson Hyperlegible: accessibility by design

Created by the Braille Institute of America, Atkinson Hyperlegible was specifically designed to maximize legibility for readers with low vision. Its approach differs from OpenDyslexic: rather than weighting letterforms, it focuses on making every character as visually distinct as possible. The letter “I” (capital i), “l” (lowercase L), and “1” (number one) are all distinctly different — a common confusion point in standard fonts. Atkinson Hyperlegible is freely available and widely used in public accessibility projects.

How to apply a dyslexia-friendly font to your documents

The challenge with PDFs is that fonts are baked into the file format. You can’t simply change the font of a PDF the way you’d edit a Word document. That’s where DysFont comes in.

Font size and line spacing also matter

Font choice is just one factor. The British Dyslexia Association recommends:

• Font size: minimum 12–14pt for body text
• Line spacing: 1.5× or double spacing
• Wide margins and short line lengths (max 60–70 characters per line)
• Left-aligned text (not justified)
• Matte paper / light background (avoid pure white)

The cream background (#FFF8F0) used on this site is not a coincidence — it reduces contrast glare compared to pure white, which many dyslexic readers find uncomfortable.

Colour and contrast considerations

Beyond font choice, background and text colour have a significant impact on readability for dyslexic readers. High-contrast black text on pure white can cause “visual stress” — a phenomenon where text appears to shimmer or move on the page. Recommended alternatives include:

• Cream or off-white backgrounds (#FFF8F0, #FFFDE7, #F5F0E8)
• Soft yellow backgrounds for readers with Irlen syndrome
• Dark navy text (#1B2A4A) rather than pure black
• Avoiding italic text, which is harder to track

Digital reading tools that complement dyslexia fonts

Font choice works best as part of a broader accessibility toolkit. Many dyslexic readers also benefit from:

• Text-to-speech (TTS): Tools like Natural Reader or built-in screen readers allow simultaneous visual and auditory processing
• Reading rulers: Digital overlays that highlight a single line of text, reducing crowding
• Bionic reading: A technique that bolds the first few letters of each word to guide the eye
• Browser extensions: Tools like OpenDyslexic for Chrome can apply dyslexia fonts to any website

Which font is right for you?

There’s no single “best” font for dyslexia — preferences vary between individuals. The most important thing is to try different options and see what feels right. DysFont lets you preview your document in 20 different fonts before downloading, so you can find your perfect match.

Why letter spacing matters more than font choice

Here’s something the font industry doesn’t advertise: letter spacing is the single most important typographic variable for dyslexic readers — more important than font choice.

Research from the British Dyslexia Association (2023) confirmed that letter spacing equal to 35% of average letter width is the primary driver of readability gains. Not OpenDyslexic. Not Lexend. Spacing.

This means a standard font like Arial with optimized spacing outperforms a specialized dyslexia font with poor spacing. The fonts that perform best (OpenDyslexic, Lexend) do so partly because they have generous default spacing — not just because of their letterforms.

What does 35% spacing look like in practice?

For a 16px font with an average letter width of ~8px:

• 35% of 8px = 2.8px of additional letter spacing
• In CSS: letter-spacing: 0.17em (approximately)
• Target range: letter-spacing: 0.15em to 0.20em

DysFont applies optimized letter spacing automatically on every conversion — regardless of which font you choose. You don’t need to calculate anything. But now you understand what’s actually happening under the hood.

Color overlays: a science-backed accessibility feature

Approximately 15–25% of people with dyslexia also experience Irlen syndrome (visual stress), where high-contrast text on white backgrounds causes text to appear to shimmer, blur, or move on the page. Color overlays directly address this.

DysFont’s five overlay colors each serve a specific purpose:

• White: High contrast, standard accessibility
• Cream: Reduces glare and visual stress — most popular (~40% of users), mimics paper color
• Blue soft: Calming effect; reduces visual crowding perception
• Green soft: Similar to blue; popular in EU educational settings (standard in ClaroRead)
• Dark mode: Reduces eye strain for evening reading; cuts blue light exposure

There is no universally “best” overlay. Different brains respond differently. The research recommendation: try all five and let your own experience guide you. The cream background on this site is not a coincidence — it’s the evidence-based default for visual stress reduction.

The NKD study: what it actually tested (and why this matters)

You may have seen claims that “research shows dyslexia fonts don’t work.” This usually refers to the NKD Foundation’s 2018 evaluation — but there’s a critical detail almost everyone gets wrong.

The NKD 2018 study tested one specific font: Dyslexie, by Christian Boer. It did not test OpenDyslexic. It did not test Lexend. It did not test Atkinson Hyperlegible. The results were mixed for Dyslexie specifically — not for the category of dyslexia-friendly fonts broadly.

The research timeline tells a clearer story:

• 2018: NKD tested Dyslexie font → mixed results for that specific font
• 2022–2023: BDA and University of Padua research → letter spacing is the primary accessibility variable
• 2025: Emerging consensus → font choice matters less than originally believed; spacing optimization is the real driver

DysFont’s position: we support OpenDyslexic, Lexend, Dyslexie, and standard fonts because the research shows font choice is less important than spacing. The font that looks good to you with optimized spacing is the right font — full stop.

Frequently asked questions