HTML Heading Analyzer
Extract every H1–H6 heading from pasted HTML or a local file and check the hierarchy: missing or multiple H1s, skipped levels, empty and repeated headings. Export the outline as a text report or CSV.
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About the HTML Heading Analyzer
HTML Heading Analyzer lists every heading from <h1> to <h6> in the HTML you paste or open, in the order they appear, with each heading’s level, text and position. It then reviews the structure and flags common problems: no H1, more than one H1, skipped levels such as an H1 followed directly by an H3, empty headings, and the same text repeated at the same level.
The HTML is parsed as an inert document in your browser, so scripts, event handlers, styles, frames and images never run or load. Because of that, headings added later by JavaScript, hidden with CSS or placed inside <template> are not considered. The result is a local structural review that helps you spot issues quickly — it is not a ranking guarantee or a full accessibility audit.
How to use
- Paste the page HTML, or click Open .html file to load a local .html or .htm file.
- Click Analyze headings.
- Read the summary and the hierarchy checks.
- Review the outline table, where flagged headings carry notes.
- Copy the report, or download it as .txt or .csv.
Key features
- Extracts H1–H6 in source order with level and text.
- Flags missing H1 and multiple H1s.
- Detects skipped heading levels.
- Finds empty headings and repeated text at the same level.
- Safe, inert parsing of pasted or local HTML.
- Copy Report, Download .txt and Download .csv.
Best practices
- Use one H1 that clearly states the page’s main topic.
- Nest headings in order — H2 for sections, H3 for sub-sections — without skipping levels.
- Write descriptive headings rather than generic labels such as “More”.
- Use headings for structure, not for styling text size.
- Test the final rendered HTML of the page, not just a template.
Benefits
- A clear outline of how a page is organised.
- Quick detection of common heading mistakes.
- Exports for audits and content reviews.
- Private: your HTML never leaves your browser.
Frequently asked questions
Is having more than one H1 an error?
It is flagged as a warning. HTML allows several H1s, but one H1 that describes the main topic is the common convention and is usually clearer for readers and tools.
What is a skipped level?
Jumping more than one level deeper, such as from H1 straight to H3, or a page whose first heading is an H3 or lower. Going back up any number of levels (for example from H4 to H2) is fine.
Does it run the scripts in my HTML?
No. The HTML is parsed as inert data, so scripts, event handlers, styles, frames and images are never run or loaded. Headings that JavaScript would add are therefore not visible to the tool.
How are headings with only an image handled?
A heading with no text but an image with alt text is reported as a warning showing the alt text. A heading with no text at all is reported as empty.
Does a clean result mean my page is accessible or will rank well?
No. Heading structure is one part of good content and accessibility. This is a local structural review only, not a ranking guarantee or a full accessibility audit.
What is in the CSV export?
One row per heading with its order, level, text and any notes, ready to open in a spreadsheet.