Free SEO tools

Which one do you need?

Pick by symptom rather than by category — it is faster, and it avoids the common mistake of checking the thing that is easy to check instead of the thing that is broken.

“My page is not in Google at all.”

Start with the indexability checker. It tests the five blockers in order of how often they are the cause, including the X-Robots-Tag header that never appears in view-source. If it comes back clean, the page is allowed in and the problem is demand, not permission — why a site is not showing up on Google covers what to do next.

“Search Console says discovered or crawled, but not indexed.”

That is usually a value or duplication judgment rather than a technical block. Run the duplicate content checker across the affected pages, then read crawled — currently not indexed.

“The site feels slow.”

The Core Web Vitals checker gives you LCP, CLS and INP for one page. Diagnosing slow page speed explains which number to chase first, because improving the wrong one is the usual reason a speed project produces no result.

“My links look wrong when shared.”

The meta tag checker reads the title, description and Open Graph tags, and flags the relative og:image that works locally and breaks everywhere else.

“I want to know if AI assistants can read my site.”

The robots.txt checker lists which AI crawlers you currently allow. Blocking them is usually inherited from a plugin or CDN default rather than chosen — see the GEO check for the full picture.

“The browser says my site is ‘Not secure’.”

The SSL certificate checker reads the certificate the way a browser does and reports whether it is valid, who issued it, and how many days before it expires — an expired certificate is the single most common cause, and it fails on a fixed date whether or not anyone is watching.

“I moved some pages and want to check the redirects.”

The redirect checker follows the chain hop by hop, flags a temporary 302 used where a permanent 301 belongs, and catches the loop that makes a page unreachable — the failure modes a migration introduces and nobody notices until rankings slip.

“I am auditing a whole site, not one page.”

Use the sitemap checker and broken link checker to establish the inventory, then work through the technical SEO audit process in order.

Why these are free, and where the limits are

Each tool makes one request to the URL you give it and reads the response. That is cheap enough to give away, so there is no signup, no credit gate and no partial result withheld behind an email form. What you see is the whole answer.

The honest limits: each tool looks at a single URL, so nothing here finds a problem that only exists across pages — a duplicated title tag is invisible to a single-page check by definition. Pages that require a login cannot be fetched, and results reflect the page as a crawler receives it, which is not always what a browser renders if the content depends on JavaScript. When you need the cross-page view, the full site check crawls instead of sampling.