A.9 WCAG 2.1 Success Criterion 1.4.9 − Images of Text (No Exception)

To achieve the highest accessibility rating, do not use text in images unless it is purely decorative, or the text as an image is central to the idea being communicated.

Before Rectification

The heading of the webpage above is an image and would not comply with Level AAA.

After Rectification

Here the image has been replaced with text and now complies with Level AAA.

WCAG 2.0 Reference:

https://www.w3.org/WAI/WCAG21/Understanding/images-of-text-no-exception