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SEOFX SEO Tools Deutsch

Free SEO tool

On-Page SEO Checker

Enter a URL and instantly check title, description, headings, images, links and structured data. With Google SERP preview, social preview and an SEO score.

No sign-up, the result appears right here on this page. The request runs through our server (AWS Frankfurt); URLs and results are not stored. Privacy policy

What the on-page check covers

On-page SEO is the sum of all optimisations directly on the website: title tags, meta descriptions, headings, images, internal linking, structured data and technical tags. Before backlinks even come into play, Google evaluates each of these components. Title and description are the shop window in the search results, and pixel width decides: Google truncates titles above 580 px and descriptions above 1000 px.

Just as important: exactly one H1 per page with a descending hierarchy (H1, then H2, then H3). Images without alt text are both an SEO and an accessibility problem. And structured data (JSON-LD) earns rich snippets that can raise the click-through rate by 30 % or more. The six check areas at a glance:

  • TITLE Title & description: Character and pixel width. Google cuts titles at ~580 px and descriptions at ~1000 px.
  • OG Open Graph & social: og:title, og:description, og:image and Twitter Cards, including live previews for Facebook and X.
  • H1 Headings & images: H1-H6 hierarchy as a tree, plus images without alt text, important for SEO and accessibility.
  • JSON Links & schema: Analyse internal and external links, find empty links and check structured data (JSON-LD).
  • META Technical tags: Canonical, viewport, robots, charset and language, the mandatory tags for clean indexing.
  • SERP SERP preview: How the page looks in Google's search results: title, URL and description in a realistic layout.

Typical findings are overly long or missing title tags, missing descriptions, several or no H1s, images without alt text, missing canonical tags (a duplicate content risk), incomplete Open Graph tags, missing JSON-LD schema and empty internal links.

Frequently asked questions

Is the On-Page SEO Checker really free?

Yes, the tool is completely free and requires no sign-up. There are no hidden costs and no feature restrictions.

How often can I use the checker?

You can check as many pages as you like, repeatedly too, to verify improvements after an optimisation. To prevent abuse there is a limit of 10 requests per minute, which is more than enough for normal use.

May I link to or recommend the checker?

Of course. We are happy when you link to the On-Page SEO Checker from your website, your blog or on social media.

How is this different from Google PageSpeed?

Google PageSpeed measures loading performance. Our checker analyses the content-side SEO factors: title, description, heading hierarchy, image alt texts, internal links and structured data. The two tools complement each other.

Do you store my data?

The URL you enter is fetched through our server (AWS Frankfurt) so the analysis also works on sites with CORS restrictions. The SEO evaluation itself then runs entirely in your browser. We store neither URLs nor results.