Hydrogen SEO
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Free SEO audit. Your score in seconds.

Paste any URL. Our free SEO checker runs 27 on-page checks, scores the page out of 100 and ranks every issue by impact, so you know what to fix first.

Free website analysisNo credit card requiredResults in under a minute

What we check

27 checks across six areas

The same checks Google and answer engines care about, grouped the way your score is calculated.

Technical

12 checks
  • Title tagPresent, and 30–60 characters so it is not cut off in results.
  • Meta descriptionPresent, and 120–160 characters for a full snippet.
  • HTTPSThe page is served securely over SSL.
  • Canonical tagTells search engines which URL is the original.
  • robots.txtA robots.txt file exists at the root of the site.
  • XML sitemapA sitemap.xml exists so every page can be discovered.
  • URL structureNo underscores and no long query strings.
  • Meta robotsThe page is not accidentally set to noindex.
  • DoctypeAn HTML5 doctype is declared.
  • Character encodingUTF-8 is declared.
  • FaviconA favicon or Apple touch icon is present.
  • HreflangLanguage alternates for multilingual sites.

Content

5 checks
  • H1 headingExactly one H1: not missing, not duplicated.
  • Heading hierarchyH2 and H3 follow the H1 in a logical order.
  • Content depthFlags thin pages with too little text to rank.
  • Keywords in URLThe path uses descriptive words, not IDs.
  • Internal linksAt least a few links to other pages on your site.

Performance

3 checks
  • Page sizeFlags heavy HTML pages that slow down loading.
  • Lazy loadingImage-heavy pages lazy-load images below the fold.
  • External linksThe page cites at least some outside sources.

Mobile

1 check
  • Viewport and mobile-friendlinessA responsive viewport meta tag, so the page renders properly on phones.

Accessibility

2 checks
  • Image alt textEvery image has alt text for screen readers and image search.
  • Language attributeThe <html> tag declares the page language.

Schema and social

4 checks
  • Structured dataJSON-LD is present, and each block has @context and @type.
  • Open Graph tagsTitle, description, image and URL for link previews.
  • X (Twitter) cardCard tags for previews on X.
  • Social share imageA complete, absolute image URL for shares.

Social tags are reported as issues but do not change the score.

How the score works

A weighted score you can actually move

Every check scores from 0 to 100. Checks roll up into six category scores, and your overall SEO score is their weighted average. Fix the critical issues in the heaviest categories first and the number moves fastest.

85–100StrongA few quick wins left.
60–84SolidTraffic left on the table.
0–59Needs workIssues holding it back.
Example

Category weights

How much each area counts toward the total.

Technical
25%
Content
20%
Performance
20%
Mobile
15%
Accessibility
10%
Schema
10%
CriticalWarningImprovementIssues are labelled and listed in that order.
Free account

Found the issues? Fix them for free.

The audit shows you what is wrong. A free account gives you every fix, and the AI to write it. 500 free credits, no credit card.

Every fix

A clear recommendation for every issue on the page, not just the top three.

AI rewrites

Titles, meta descriptions, alt text and schema written for your page.

Bulk audit

Queue many URLs at once and get one report, ranked by impact.

WordPress one-click apply

Connect the free plugin and apply fixes without copy and paste.

Create free account

No credit card required · Free forever plan

FAQ

Free SEO audit questions

Is this SEO audit really free?

Yes. You can run the audit on this page without an account or a credit card. You get your score, your category scores, every issue we found and the full fix for the top issues. A free account unlocks every fix, the AI rewrites and 500 AI credits, still with no card.

How is my website SEO score calculated?

Each check scores from 0 to 100. Checks roll up into six categories: technical (25%), content (20%), performance (20%), mobile (15%), accessibility (10%) and schema (10%). Your overall score is the weighted average of those six category scores.

What does the free SEO checker look at?

27 on-page checks: title and meta description length, headings, content depth, internal and external links, image alt text, canonical and meta robots tags, HTTPS, robots.txt, the XML sitemap, structured data, Open Graph and X cards, favicon, doctype, encoding and more.

Does it audit my whole site or one page?

The free audit checks the URL you enter, plus site-wide files such as robots.txt and the sitemap. With a free account you can queue many URLs at once with the bulk audit and get one ranked report.

Do I need WordPress?

No. The audit works on any public website. If you run WordPress, the free Hydrogen SEO plugin brings the same checks into the editor and applies fixes in one click.

Why did the audit fail on my site?

The page has to be public and reachable. Pages behind a login, a firewall that blocks automated visitors, or a very slow server can fail. The free audit is also limited to a few runs per hour, so if you hit the limit, create a free account to keep going.

Check another page

Your homepage, a product page, your best blog post. Every page has its own score.

No credit card required · 500 free credits when you sign up