Paste HTML to visualize heading structure and detect accessibility issues.
Screen readers use headings to navigate page structure. Skipping levels (e.g. H1 to H3) makes it harder for assistive technology users to understand the content hierarchy.
Best practice is one H1 per page representing the main topic. Multiple H1s are technically valid in HTML5 but can confuse screen readers and hurt SEO.
No. Everything runs locally in your browser.