Heading Highlighter – SEO Heading Checker

Highlight H1–H6 headings in color and check your page's heading structure for SEO.

Heading Highlighter – SEO Heading Checker makes the heading structure of any web page visible in one glance. It color-codes every heading (H1 through H6) directly on the page and shows the full H tag hierarchy as a clean, indented outline in a compact popup. It is handy for SEO audits, accessibility checks, content editing, and web development. FEATURES • Color-coded headings Each heading level gets its own background color, so you can instantly spot the hierarchy and find gaps or skipped levels: H1 – red, H2 – blue, H3 – green, H4 – yellow, H5 – purple, H6 – orange. • Page outline in the popup Click the toolbar icon to see all headings on the page, ordered and indented by level, with the tag and the heading text (for example, "h2 Pricing"). • Click to jump Click any heading in the outline to smoothly scroll to it on the page. • Auto-highlight toggle Turn automatic highlighting on or off with a single switch. Your choice is saved and applied to all pages you open afterwards. • Reload shortcut Changed the setting? A reload button at the bottom of the popup lets you apply it right away. • Clean, minimal design A calm, modern interface with automatic light and dark theme support. PRIVACY The extension works entirely in your browser. It does not collect, store, or transmit any personal data or browsing history, and it makes no network requests. The only thing saved is your on/off preference. PERFECT FOR • SEO specialists checking heading structure • Accessibility auditors verifying heading order • Content writers and editors reviewing document hierarchy • Front-end developers debugging page markup