Free SEO Checker (2026): 10 Tools Compared

A free SEO checker can show you in a few minutes whether a page has a missing title, a broken link or a slow load. It won't fix anything for you, but it gives you a short list of jobs, and for a small site that's often all you need.

Here are ten checkers and auditors, in no particular order, sorted alphabetically. Three are familiar names and the rest are smaller. I've taken every description from each tool's own website and directory listings, so check current limits on each site before you rely on one. If you'd like to see what an audit involves from start to finish, my walkthrough of an SEO site audit is a good companion.

Free SEO checkers side by side

In the free plan column, Yes means the tool's own site shows a permanent free tool, free tier or free version. Trial only means a free trial with no ongoing free plan. No would mean neither. Free versions usually limit pages, checks per day or features, so read the small print.

Tool	Type	Good for	Free plan
Ahrefs Webmaster Tools	Site audit and analytics	Site health checks for sites you own	Yes
Rank Math SEO Analyzer	Online page analyzer	A quick report on one site	Yes
Screaming Frog SEO Spider	Desktop crawler	Finding broken links and missing titles	Yes
Semrush SEO Checker	Online page checker	A single-page check from a larger suite	Yes
SEO Review Tools	Collection of web tools	Many small checkers in one place	Yes
SEO Site Checkup	Online checkup	A summary of passed and failed checks	Yes
Seobility	Online checker and tools	On-page and technical checks without registration	Yes
Seomator	Online audit	A fast audit with no account	Yes
Sitebulb	Desktop crawler	Visual audits with guided hints	Trial only
Sitechecker	Online checker and extension	Instant on-page checks and a browser add-on	Yes

Ten free SEO checkers and site auditors

Ahrefs Webmaster Tools

Best for: Owners who can verify their own site and want regular technical audits plus simple search traffic reports.

Rank Math SEO Analyzer

Best for: WordPress owners who want a quick report on their site and may add the matching plugin later.

Screaming Frog SEO Spider

Best for: People who are happy to install software and want to crawl a small site on their own computer.

Semrush SEO Checker

Best for: Anyone who wants a quick look at one page and may later explore the wider platform.

SEO Review Tools

Best for: Freelancers who like a long menu of single-purpose checkers and run them one by one.

SEO Site Checkup

Best for: Small business owners who want one clear list of passed, failed and warning checks for a site.

Seobility

Best for: Beginners who want several small free checkers in one place, without making an account first.

Seomator

Best for: Owners who want a quick audit report and a view of how ready the site is for AI search.

Sitebulb

Best for: People who want a crawler that explains each issue visually and are fine starting with a trial.

Sitechecker

Best for: Owners who want an instant check of a home page, plus a browser extension for spot checks.

What to look for in a free SEO checker

Most checkers cover the same basics, so the differences come down to a handful of things.

• Page or whole site. Some check one address, while crawlers visit many pages and find problems you'd never spot by hand.
• Online or installed. Web checkers are quick to try, whereas desktop crawlers keep the work on your own computer.
• Limits. Free versions often cap the number of pages, checks per day or reports you can save.
• Clear explanations. A good report says what is wrong, why it matters and what to change.
• Sign-up needed. Some give you a report straight away and others ask for an account first.
• Ownership checks. A few tools only audit sites you can prove you own, which is sensible but takes a few extra minutes.

Questions to ask before you run a free SEO check

• Which pages do I most want checked: the home page, my top service pages, or the whole site?
• Does the report tell me what to do next, or only list problems?
• Will I need to make an account, and what happens to my details?
• Can I save or export the results before the free limit resets?
• Does the tool check how a page looks to AI search tools as well as to Google?
• Can I run it again after my changes to see what improved?

If you're still weighing up how much help a tool gives you, my piece on whether SEO tools earn their place for small sites might help.

Which type of SEO checker suits which site

• A brand-new small site usually only needs a quick online checker for titles, descriptions, headings and speed.
• A blog with plenty of posts gains most from a crawler that finds broken links and duplicate titles across every page.
• A site you build for clients often suits a tool that produces a clean report you can walk through together.
• A WordPress site can pair an online analyzer with a plugin that fixes issues in the same place.
• A site you don't own can still be checked with public-page checkers, which suits competitor research.

Mistakes people make with a free SEO audit

• Treating the overall grade as the goal, when a fix that helps real visitors matters more.
• Trying to clear every warning, including ones that don't apply to your site.
• Running the check once and never again, so new problems pile up unseen.
• Changing many things at once, which makes it hard to know what helped.
• Overusing a single keyword because a checker suggested it. My page on keyword density explains why that's a trap.

Why a smaller SEO checker can be a smart pick

Smaller checkers tend to do one job and explain it plainly, and some give you a report without making you set up an account. That makes them easy to try on a single page.

Before relying on one, check that it's still being updated, read what it says about stored data and try it on a page where you already know the issues. If it misses the obvious ones, move on.

Do you make an SEO checker or site audit tool? Tool makers can ask to be considered for a featured place on this list.

Last steps with your SEO checker shortlist

Pick two tools that suit the size of your site, run both on the same page and compare what they flag. Fix the issues they agree on first, note down anything that surprises you and run the check again a week later. Keep the one whose reports you act on.

Frequently asked questions

What is a free SEO checker?

It's an online tool or program that scans a page or site and flags issues such as missing titles, slow loading, broken links and thin headings, usually with a short fix list.

Are free SEO checkers accurate?

They're good at spotting mechanical problems like missing tags and broken links. They can't judge your content or your market, so treat them as a to-do list, not a final judgement.

Do I need an account to use one?

It depends on the tool. Some show a report straight away, while others ask you to sign up or verify that you own the site first.

How often should I run a check?

Many owners run one after any big site change and then every month or two. More often makes sense for large sites that change daily.

Can I check a competitor's site?

Many web checkers can analyze any public page, though tools that require site verification only cover sites you own.

Will fixing every issue improve my search results?

Not on its own. Technical fixes remove obstacles, but useful content and a clear match to what people search for still matter most.