Use your real text
Paste actual copy from your site or app so the test reflects how it will really look, not generic placeholder text.
Font Size Accessibility Tester
Type or paste your own text, then adjust size, zoom, line-height and letter-spacing to see how legible it stays for real readers.
How it works
Adjust the sliders
Change font size, simulated zoom, line-height and letter-spacing to see how each affects comfortable reading.
Check the guidance
The badge below the preview flags sizes that fall under common WCAG-aligned readability thresholds.
FAQ
What font size does WCAG recommend for body text?
WCAG does not mandate an exact pixel size, but a common practical baseline is 16px (1rem) for body text, since smaller sizes are harder for many users to read comfortably, especially at typical viewing distances.
Why test at 200% zoom?
WCAG 1.4.4 (Resize Text) requires that text can be resized up to 200% without loss of content or functionality. Testing your layout at that zoom level helps catch text that gets clipped or overlaps.
Does line-height affect readability too?
Yes. WCAG 1.4.12 recommends a line-height of at least 1.5 times the font size for body text, along with adequate paragraph and letter spacing, to help readers with low vision or dyslexia.