Accessible Font Size Checker
Preview type sizes, spacing, and scaling so body text stays readable when users zoom or change default font size.
Font Size Controls
Adjust typography settings and see real-time changes with accessibility feedback
The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs. How vexingly quick daft zebras jump! The five boxing wizards jump quickly.
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation.
Relative Size (rem)
1.000rem
Characters per Line
~22
Why font size accessibility matters
Many people enlarge text, use browser zoom, or rely on larger system fonts. Tiny body copy and fixed layouts that break at 200% zoom push those users away. Designing for resize is part of inclusive UI—not a niche edge case.
WCAG 2.1 Success Criterion 1.4.4 (Resize Text) asks that text can scale to 200% without loss of content or functionality. A common starting point for body text is about 16px (1rem), then adjust for the typeface's x-height and your layout. Pair size with contrast; use a contrast checker for color pairs.
Practical guidelines
- Body text around 16px / 1rem or larger, tuned to the font
- Line height near 1.5 for paragraphs
- Relative units (rem/em) so zoom and user settings work
- Enough contrast against the background
- Test at 200% zoom and with larger default font sizes
- Watch weight, letter-spacing, and line length together
Readability beyond the pixel number
Aim for roughly 45–75 characters per line when you can. On small screens, slightly larger body text often helps touch targets and glance reading. Keep relative scale between body, captions, and headings so hierarchy survives zoom.
Typefaces render at different visual sizes at the same px value—Georgia often looks larger than Arial at 16px. Validate with the fonts you ship, not only with a generic preview.
Best practices
- Clear heading hierarchy (one h1, logical h2–h6 order)
- Consistent spacing ratios
- Responsive checks on phone and desktop
- Screen-reader and keyboard smoke tests after typography changes
Compliance note
Accessibility rules and enforcement differ by region (for example ADA-related cases in the US, and broader digital accessibility laws in the EU and UK). Meeting WCAG AA is a practical baseline whether or not a lawyer is involved. Readable type is also simply easier for everyone on bright screens and long sessions.
Frequently Asked Questions
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