Semantic HTML.

Visible.

Semantic HTML Analyzer

13 HTML5 elements. Green borders show which you’re using. Red X marks which you’re missing.

One click reveals your page structure.

example.com/blog/post

8/13

<nav>

<main>

<aside>

Checks 13 Semantic Tags

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Why Semantic HTML
Matters for SEO

Search engines don’t just read your content. They read your structure.

HTML5 introduced 13 semantic elements that tell browsers and search engines exactly what each section of your page means.

<header>

✓

1 found

<nav>

✓

2 found

<main>

✓

1 found

<article>

✗

not found

<section>

✓

4 found

<aside>

✗

not found

<footer>

✓

1 found

<figure>

✗

not found

<figcaption>

✗

not found

<time>

✗

not found

<address>

✗

not found

<mark>

✗

not found

<details>

✗

not found

Google uses these to understand content hierarchy. Screen readers use them for accessibility. You should use them to structure your pages.

This tool shows you exactly which ones you are using and which you are missing. Green borders highlight found elements. Red X marks the gaps. Semantic structure is one layer. The other eight Technical SEO Tools cover schema, links, speed, and crawl rules.