Can it check that my PDF meets accessibility requirements?

The Accessibility Checker is a quick first pass over the basics screen readers rely on: tagging, document language, title, image alt text and form field descriptions. It doesn't certify PDF/UA or WCAG conformity, and it skips colour contrast, reading order and table headers. For a legal, procurement or published government document, follow up with a full audit using a dedicated tool such as the free PAC. There's more in why the checker exists.