On-Page SEO Checker

What is the On-Page SEO Checker?

The On-Page SEO Checker is a free tool that reads the HTML of one page and scores it out of 100. It marks each check as a pass, warning or fail across ten groups, from the URL, title and meta tags to headings, images, links and crawlability. A target keyword adds checks on where it appears.

How to use the On-Page SEO Checker

1. Paste the full URL of the page to check. The tool reads that exact URL, so include the path.
2. Add a target keyword if you want placement checks. It adds six: the keyword in the URL path, the title, the meta description, an H1 and image alt text, plus its density in the body copy.
3. Press Check on-page SEO.
4. Read the score and the count of fails, warnings and passes, then the page overview: word count, load time, page size, images and internal links.
5. Open the ten check groups, from URL Structure to Crawlability, and fix the fails first.

What does an on-page SEO checker check?

An on-page SEO checker reads what a crawler can see in one page's HTML without visiting any other page. This one runs checks in ten groups: URL structure, title tags, meta tags, headings, content, images, links and hreflang, code quality, technical SEO and crawlability.

It reads the HTML the server sends, which is the version a crawler receives first, and lists every check with its result so you can see what passed as well as what to fix. For the same page as a list of fixes ranked by impact, use the On-Page SEO Audit.

How is the on-page SEO score calculated?

The score is the share of checks the page passes. A pass counts one point, a warning half a point and a fail nothing, and the total is divided by the number of checks that ran and shown out of 100.

Every check carries the same weight, so start with the fails on the title, H1, meta description, HTTPS and mobile viewport, then work through the rest.

What title length, meta description length and H1 count does it want?

A title passes at 30 to 60 characters and a meta description at 120 to 160. Google cuts titles by pixel width, not by character count, so 60 characters is a safe proxy rather than a hard limit. The Meta Description Length Checker measures both the title and the description in pixels. The meta description is not a ranking factor, and Google often writes its own snippet from the page text.

One H1 passes, none fails and more than one warns. A skipped heading level, such as an H2 followed by an H4, is a warning. The Heading Checker shows the full H1 to H6 outline. Alt text passes when every image has a non-empty alt attribute.

What do the code quality and crawlability checks look for?

The code quality group checks for an HTML5 doctype, a lang attribute on the <html> element, and how many inline styles and inline scripts the page carries. Up to 5 elements with a style attribute pass and more than 15 fail; up to 3 inline scripts pass and more than 8 fail. None of these decides rankings on its own, but a missing doctype or language is a quick fix.

The crawlability group reads the robots meta tag. A noindex keeps the page out of search results and a nofollow tells search engines not to follow its links, so both are flagged for you to confirm they are deliberate. It also looks for a <link rel="sitemap"> in the head, which few sites use, so a warning there matters far less. The Noindex Checker also reads the X-Robots-Tag response header, which this checker does not.

Is this the same as a Google SEO checker?

No tool can show how Google scores a page, because Google does not publish a score. This checker tests the page against basics Google documents in its SEO guidance, such as descriptive titles, meta descriptions, headings, alt text, HTTPS and a mobile viewport, plus thresholds of its own for things like title length and word count.

For Google's own view, use the URL Inspection tool in Search Console, which shows whether a page is indexed and how Google rendered it. To check whether a URL is in Google's index without an account, try the Google Index Checker.

On-page, off-page or technical SEO checker: what is the difference?

An on-page checker reads one page's own HTML, an off-page checker looks at what other sites say about yours, mainly links, and a technical checker looks at how the whole site is crawled and served. This tool is on-page, with a few technical checks for that one page: HTTPS, the viewport, the robots meta tag and code quality.

Site-wide problems, such as robots.txt rules or broken links across many pages, need tools that go beyond a single URL.