Make Slides
Readable.
This contrast checker measures the contrast ratio between text and background colors. It shows WCAG AA and AAA pass or fail for small and large text, plus a slide preview so you can see what your audience sees.
1. What is Contrast Ratio?
Contrast ratio is a number that describes how different two colors are in brightness. Higher is easier to read. Low contrast makes text disappear in bright rooms, on projectors, and on bad screens.
2. WCAG Rules (AA vs AAA)
- AA: 4.5:1 for normal text, 3:1 for large text.
- AAA: 7:1 for normal text, 4.5:1 for large text.
- Slides are often shown in bad conditions, so aiming higher than the minimum is safer.
3. Slide Contrast Tips
Avoid light gray text. Projectors wash it out fast.
If body text fails AA, do not use it. Headline-only slides are not a fix.
If your brand color fails, use it as an accent, not as body text.
FAQ
what is a good contrast ratio for slides?
Aim for AA as a minimum. For decks shown on projectors or in bright rooms, higher is safer.
why does it fail on a projector?
Projectors have lower contrast and rooms add ambient light. Colors that look okay on a laptop often wash out in real presentation conditions.
can i use brand colors that fail wcag?
Yes, but use them as accents or shapes, not as body text. Keep text contrast high and let brand color add highlights.