Free SEO Checker (+ Guide)

What is an SEO checker?

An SEO checker is a tool that reads a web page and tests the things search engines look at: its title, description, headings, content, links and technical setup.

Mine also runs Google Lighthouse, so you get speed, accessibility and best practices in the same report.

How to check your page's SEO

What the SEO checker looks at

The report reads the raw HTML, without running JavaScript, the way most crawlers do. It looks at 4 groups:

• On-page – the title, meta description, H1, heading outline, words, image alt text, keyword density and internal links.
• Site basics – HTTPS, mixed content, noindex, canonical, robots.txt, sitemap, language, doctype, character set, the phone viewport and the favicon.
• Social sharing – Open Graph tags, the X card and links to your profiles.
• Local – LocalBusiness markup, when the page has a phone number or a map.

Each check shows the evidence it read, like your title and its length, so you can see why it passed or failed.

The most common SEO issues, and how to fix them

I ran five well-known pages through the checker on October 1, 2026, to see what it finds on real sites:

A famous site can get away with a score like 49. Most pages can't, so the fixes below are worth the few minutes they take.

These are the issues I see most, with the fix for each:

• No meta description – write one of about 150 characters that says what the page gives.
• No H1, or several – give the page one main heading that says what it's about.
• Thin content – a page with a few dozen words gives Google little to rank, so add the answer people came for.
• Images without alt text – describe each image in one sentence for screen readers and Google Images.
• No phone viewport – add the viewport tag, or phones show a shrunken desktop page.
• Insecure images on a secure page – load every image over https, or browsers may block them.
• No Open Graph tags – add a title and an image, so a shared link shows a proper card.

Each check in the report has its own How to fix, with the code to paste where it helps, and the title and meta checker shows exactly how your title and description look in Google.

Google Lighthouse, in the same report

Lighthouse is Google's own test. It loads the page on a mid-range phone over a slow connection and scores performance, accessibility, best practices and SEO.

The report shows all 4 scores, the load as a film strip, and every audit that failed, with Google's explanation. When Google has enough real Chrome visits, you also see your Core Web Vitals from real people.

Local SEO checks

If people visit your business, Google needs to know where it is and how to reach it.

The checker reads three things for that: your local business schema, the contact details a visitor can see, and any map or coordinates. When the schema has a phone, it also checks that it matches the one on the page.

Here's what four store pages showed on October 1, 2026:

Apple's page hands Google its name, address, phone, hours and coordinates in one place. The other three leave Google to work out the details from the page.

A page that isn't a local business passes all three checks. You only need them if people come to you.

How the score works

The score is out of 100, from 5 parts: on-page counts 35, site basics 25, social 10, speed 15 and accessibility 15.

A warning is worth half a check's points. If Google can't load your page, speed and accessibility are left out, never counted against you.

80 and up is strong SEO, 50 to 79 needs work, and under 50 needs a lot of work. A page in the 90s still has a few small fixes worth making.

SEO now that people search with AI too

Google says there are no extra requirements to appear in its AI Overviews or AI Mode, and that the best practices for SEO still apply.

So the same basics this checker tests, a clear title, real content, headings, alt text and a page Google can index, are what its AI features read too.

Other AI tools send their own crawlers, and a robots.txt can keep them out without you knowing.

Check that with the AI crawler checker, and see how ready your whole site is for AI agents with the AI agent readiness checker.

Beyond the checks

The report also shows the page's heading outline, the words and phrases it uses most and where they appear, every link with its text, and the technology the page runs on.

Fix the top of the list first, then check again. The score moves as soon as your changes are live.

Who is the SEO checker for?

It's for anyone who wants a page to be found:

• Title and meta checker – writers checking how a page looks in Google before it goes live
• Schema markup generator – site owners adding the structured data the checker asks for
• Sitemap generator – anyone whose site has no sitemap yet
• AI crawler checker – site owners who want AI search to read them too
• How to start a blog – new bloggers checking their first posts

And if you're checking a competitor, run both pages and copy what theirs does better.