Heading Accessibility Checker
Fast, secure, client-side utility running entirely in your browser with zero server dependencies.
Heading Accessibility Checker
Audit HTML heading structures (H1 through H6), detect skipped levels, and generate an interactive document outline for screen reader navigation.
Heading Hierarchy Status
COMPLIANT
Sequential H1-H6 hierarchy
H1 Presence Check
PRESENT
1 H1 tag found
Skipped Heading Levels
0 Skipped
e.g. H2 directly to H4
Total Headings Mapped
0 Headings
Document outline nodes
Quick Overview & Direct Answer
Heading Accessibility Checker - H1-H6 Hierarchy & Outline Validator: Free Heading Accessibility Checker tool: analyze heading hierarchy (h1 through h6) to detect skipped levels, missing h1 tags, empty headings, and broken.
Primary Use
Color contrast ratio calculation, WCAG compliance checking, alt text testing
Input Formats
Foreground and background hex colors, font size
Output Format
Contrast ratio (e.g. 7.1:1), WCAG AA/AAA pass/fail compliance
Processing Mode
100% Client-Side In-Browser Accessibility Testing
Access Tier
Free, unlimited, no sign-up needed
How to Use the Heading Accessibility Checker
1
Paste Webpage HTML Content
Insert any HTML article, landing page, or section containing heading tags (
through ).
2
Validate H1 Heading Presence
Ensures the document contains exactly one top-level
that accurately represents the overarching page subject.
3
Detect Skipped Hierarchy Levels
The tool audits transitions (such as jumping from
directly to ), which disrupts screen reader outline navigation.
4
Inspect Interactive Document Outline
Review the indented hierarchical tree to verify that subsections nest logically under their parent sections.
Comprehensive Guide: Heading Accessibility Checker
Screen reader users rely on heading tags as their primary tool for skimming web pages. Visual users skim content by scanning large bold text across the screen; blind users press the `H` key to jump sequentially through headings, or press `1` through `6` to jump directly to specific heading levels. Under WCAG 1.3.1 (Info and Relationships) and 2.4.6 (Headings and Labels), heading markup must reflect the logical outline of the content.
A widespread error in front-end development is choosing heading tags based on visual font size rather than structural hierarchy. For instance, a developer who wants a small font size in a sidebar card might use an `
` directly under an ``, skipping `` and ``. To a screen reader user, jumping from level 1 to level 5 falsely implies that four layers of nested parent content were skipped, causing disorientation.
` and ``. To a screen reader user, jumping from level 1 to level 5 falsely implies that four layers of nested parent content were skipped, causing disorientation.
The single `
` rule remains a cornerstone of clean web architecture. While the HTML5 specification technically permitted multiple `` elements inside nested `` and `` tags, browser assistive technology vendors never fully implemented the proposed HTML5 document outline algorithm. Consequently, accessibility standards and SEO guidelines mandate a single `` per page representing the page title, followed by `
` per page representing the page title, followed by `
Headings must never be left empty. Developers occasionally insert empty heading tags (such as `
` or ``) to reserve visual space in CSS or inject background graphics. Screen readers still encounter these empty tags, announcing "Heading Level 3" followed by total silence, confusing users into thinking content failed to load.Key Features & Capabilities
Visual Document Outline Tree
Generates an indented structural outline showing exact heading hierarchy nesting relationships.
Skipped Level Detection
Flags unnatural jumps (e.g. H2 -> H4) that disrupt screen reader skimming shortcuts.
H1 Uniqueness & Presence Audit
Verifies the presence of a single, authoritative H1 title matching SEO and accessibility best practices.
Empty Heading Tag Flagging
Identifies empty headings that create confusing blank announcements in VoiceOver, NVDA, and JAWS.
Separates Visual Style from Semantics
Guides developers toward using CSS classes for sizing rather than abusing heading tags for styling.
Instant Client-Side Parsing
Parses DOM elements directly in your browser with zero latency and complete code confidentiality.
Frequently Asked Questions
Heading tags define the semantic hierarchy and table of contents of your document. Using an simply because you want small text breaks the outline for screen reader users. The correct approach is to use the structurally correct heading (e.g. ) and apply a CSS class (e.g. class="text-sm font-semibold") to style its visual appearance.
While HTML5 technically allows an inside each or , assistive technologies do not treat these as independent sub-outlines. Having multiple tags dilutes the clear page topic for both screen readers and search engines. Having exactly one per page is the recognized industry standard.
Screen reader users navigating by heading levels may assume they missed critical parent content between the sections, or wonder if content failed to load properly. Keeping headings sequential (H1 -> H2 -> H3) provides an intuitive, predictable document structure.
Yes. If a legacy codebase restricts changing the HTML tag, you can specify role="heading" aria-level="2" on an element to override its programmatic heading level in the accessibility tree.
On homepages, wrapping the main site logo/name in an is acceptable. On interior pages, however, the should be reserved for the specific topic of that page (e.g. "Product Pricing" or "About Us"), while the site logo should remain a standard link without an .