Free diagnostic utility
Inspect page titles, canonicals, robots directives and headings
Paste a page's HTML and examine five signals with their actual extracted values and practical interpretation. No signup, payment or external URL fetch.
Free HTML source inspector
Paste HTML or try the included illustrative example.
The tool inspects pasted markup only. It does not fetch a URL, inspect live server headers, execute scripts, or transmit the source to SiteBoost.
What this tool checks—and what it cannot
The inspector reads the HTML you provide and extracts the document title, meta description, canonical link, page-level robots meta tag and visible H1 elements. It reports missing values and cases worth reviewing, such as two canonical links or a noindex directive. It does not turn every missing optional field into a critical problem.
Unlike a live crawler, this tool does not make requests to the address in your page. It cannot confirm whether your URL returns HTTP 200, whether a redirect works, what an HTTP X-Robots-Tag header says, what robots.txt allows, or whether Google actually indexed the document. Those questions require live URL and Search Console checks. Inspecting pasted HTML is deliberately narrower and easier to verify.
How to obtain the right source
- Open a public page in your browser. If you are testing search accessibility, use a private window so a signed-in session does not hide restrictions.
- Choose View Page Source and copy the document HTML. For pages rendered substantially with JavaScript, inspect the final HTML in browser developer tools as a second comparison.
- Paste that source into the inspector, then select Inspect HTML. The example button loads a fictional website's markup so you can see the output without sharing your own page.
- Read the extracted values before acting on an observation. For example, a canonical that points at a different URL may be intentional on duplicate pages, but suspicious when an original guide points at the homepage.
- Make an isolated change on the real site, redeploy, and inspect the result again. Then use Search Console URL Inspection to evaluate Google's latest crawl information.
Worked example: a canonical that hides the preferred guide
Imagine an illustrative guide at example.com/guides/mobile-seo. Its HTML has a distinctive title and H1, but the canonical points to example.com/. The inspector would mark the canonical as found, not automatically broken: it cannot tell which URL the publisher intended. The useful next step is to compare the guide's purpose with the canonical destination.
<title>Mobile SEO Checklist | Example</title>
<link rel="canonical" href="https://example.com/">
<h1>Mobile SEO checklist</h1>
If the guide is independently useful and should be indexed, the canonical normally ought to identify that guide's preferred address. Correct the actual page template rather than treating every guide as the homepage. If the guide is substantially a duplicate and the homepage truly represents the content, the intended configuration could be different. Canonicals express a preference; Google can still choose another canonical.
Worked example: noindex and robots.txt are not interchangeable
A page with noindex,follow in a meta robots tag is explicitly asking compliant crawlers not to index it. The inspector highlights that instruction for review, not as a universal error: private or temporary pages may intentionally carry noindex. By contrast, a robots.txt disallow rule lives outside the HTML document and is invisible to this pasted-source check.
Blocking a URL in robots.txt may prevent a crawler from seeing the page's noindex instruction at all. If you need to protect confidential material, neither approach replaces authentication. Keep account pages, receipts and private reports protected by server-side access controls; do not add them to a public sitemap.
Prioritize outcomes instead of chasing a score
| Finding | What to verify next | Why it matters |
|---|---|---|
| Unexpected noindex | Source, rendered HTML and HTTP headers | May exclude an intended public URL |
| Wrong canonical | Preferred URL, duplicates and templates | Conflicting URL preference signals |
| Vague title | Actual page intent and search snippet | Harder for readers to assess relevance |
| No description | Does the page benefit from a concise summary? | Missing opportunity for an informative snippet |
| No H1 | Main visible heading and document hierarchy | May reduce reading clarity and accessibility |
The inspector intentionally does not produce a synthetic SEO score. It is a narrow diagnostic to help identify evidence worth checking—not a prediction of rankings, eligibility for ads or total website quality.
Continue the investigation
If the canonical or robots findings need a live follow-up, use the crawl and indexing troubleshooting walkthrough. For a broader order of operations, read the technical SEO checklist. Both guides are available without creating an account.
Method: browser DOM parsing of user-pasted HTML only. Sample source is invented for illustration. No user source is uploaded to SiteBoost by this utility and no live website or ranking data is claimed.