Catch missing H-tags
before you ship

Heading tags (H1-H6) create a document outline that helps search engines understand your content hierarchy. Google uses headings to identify primary topics (H1), major sections (H2), and supporting details (H3-H6). Proper heading structure can improve rankings by 10-30% because it signals topical organization, influences featured snippet extraction, and improves user experience metrics like time on page and engagement.

During site migrations, heading structure often breaks in subtle ways. Component-based frameworks (React, Vue, Next.js) can accidentally create multiple H1 tags when header and page components both render H1s. Page builders that used CSS classes instead of semantic tags can lose heading hierarchy entirely when migrating to headless CMS. These issues confuse search engines about your page's primary topic and can significantly hurt rankings.

Common migration mistakes include multiple H1 tags (dilutes topical focus), skipped heading levels like H2 to H4 without H3 (breaks document outline logic), missing H1 entirely (search engines can't identify primary topic), or significantly changed heading text that shifts topical signals. This tool compares heading structure before and after migration to catch these issues before launch.