SEO Check

What is an SEO check?

An SEO check (search engine optimization analysis) assesses how well your website is optimized for search engines like Google. Our free SEO checker analyzes more than 50 factors and gives you a score from 0 to 100. You also get a concrete improvement plan with the most important action items, sorted by impact.

Unlike many other SEO tools that only show individual checks, our tool combines on-page analysis with technical checks, security headers and DNS analysis. The result is a complete picture of your website's SEO health.

What gets checked?

The SEO analysis is divided into 6 categories that add up to 100 points:

The 6 categories explained

1. Meta & On-Page (25 points)

Meta tags are the first impression search engines get of your page. The title tag appears as the clickable link in search results and is one of the strongest ranking factors. A good title tag contains your primary keyword, is 50-60 characters long and accurately describes the content of the page.

The meta description appears as a short summary below the title in search results. Although Google does not use the meta description directly as a ranking factor, a good description does influence the click-through rate (CTR). Our checker also checks whether you have set Open Graph tags for social media sharing, defined a canonical URL to prevent duplicate content, and set a favicon.

2. Content & Headings (25 points)

Content is at the heart of SEO. Without relevant, high-quality content, technical optimization has little effect. Our SEO check analyzes whether your page has a unique H1 tag (there should be only one H1 per page), whether the heading hierarchy is built up logically (H1 → H2 → H3, without skipping levels), and how many words your page contains.

For most pages, the more in-depth the content, the better. Pages with fewer than 300 words are considered "thin content". For blog articles, 1500-2500 words is optimal. The checker also measures the text-to-HTML ratio (the share of the page that is actual text versus HTML code), the number of internal and external links, and the overall readability of your content.

3. Technical (20 points)

Technical SEO is the foundation of your website. If the technical basics are not right, search engines cannot crawl and index your pages efficiently. Our tool checks whether your website uses HTTPS (required for a secure connection and a Google ranking factor since 2014), whether HTTP/2 is enabled for faster load times, and whether compression (gzip or Brotli) is active.

We also measure your page's load time, the total page size, whether the viewport meta tag is set correctly for mobile devices, whether the page language is defined, whether the right charset (UTF-8) is set, and whether structured data (Schema.org) is present. Structured data helps search engines understand your content better and can lead to rich snippets in search results.

4. Images (10 points)

Images can make or break a website's SEO. Without alt text, search engines do not know what an image shows. Without lazy loading, all images load at once, which slows the page down. Our checker checks whether all images have a descriptive alt attribute, whether lazy loading is enabled for images outside the visible screen, whether image dimensions (width/height) are set to prevent layout shifts, and whether modern image formats such as WebP or AVIF are used.

5. Security Headers (10 points)

Security headers protect your website and visitors against common attacks. Google treats security as a ranking factor. Our SEO check checks for six important security headers:

• HSTS (Strict-Transport-Security): Forces HTTPS connections and prevents downgrade attacks.
• CSP (Content-Security-Policy): Limits which sources a browser may load and protects against XSS attacks.
• X-Frame-Options: Prevents your site from being loaded in an iframe on another site (clickjacking).
• X-Content-Type-Options: Prevents MIME type sniffing by browsers.
• Referrer-Policy: Controls which referrer information is sent along when navigating.
• Permissions-Policy: Manages which browser features (camera, microphone, geolocation) your site may use.

6. DNS & Domain (10 points)

DNS configuration is the invisible foundation of your website. If your DNS is not set up correctly, your site may be unreachable or you may run into email problems. The checker verifies whether your domain has a valid A record (the IP address where your site is hosted), whether IPv6 (AAAA record) is available for future-proof connectivity, whether SPF and DMARC records are present to prevent email spoofing, whether your nameservers are configured correctly, and whether MX records are present for email delivery.

How to use the SEO score

The SEO score gives an indication of your page's technical and on-page optimization. Use the score as a starting point, not as a final verdict. A high technical score means the basics are in place, but off-page factors such as backlinks, domain authority and brand awareness also play a big role in your final rankings.

• 80-100: Well optimized. The technical foundation is strong. Now focus on content quality, internal linking and earning quality backlinks for further growth.
• 50-79: A reasonable foundation, but there are concrete points to improve. The items in the improvement plan are relatively easy to fix and have a direct impact on your rankings. Start with the items marked as "high impact".
• 0-49: There are serious technical or on-page problems that are actively holding back your rankings. Tackle these as a priority. Often it comes down to missing HTTPS, no meta tags, or serious content shortcomings.

The improvement plan

What makes our SEO checker unique is the automatically generated improvement plan. After the analysis, all problems found are sorted by impact and presented as concrete action items. Each item in the improvement plan includes:

• Priority number: From 1 (highest impact) up to the total number of improvements.
• Action: A clear description of what you need to do.
• Impact estimate: High, medium or low. Always start with the high-impact items.
• Current value: What the checker found, so you know what needs to change.

SEO check tool comparison

There are many SEO tools available. Below is a comparison of our free SEO checker with other popular tools:

When should you run an SEO check?

Regular SEO checks are essential for a healthy website. We recommend running an SEO check in the following situations:

• After launching a new website: Check that all the technical SEO basics are set up correctly before you start creating and promoting content.
• After a website redesign or migration: Redesigns and migrations are the riskiest moments for SEO. Check that redirects work correctly, meta tags have been kept and structured data is still intact.
• Monthly, as a routine: Run a check at least once a month to catch regressions in time. Plugins, theme updates and content changes can unintentionally overwrite SEO settings.
• After publishing new content: Check that new pages and blog articles meet all SEO requirements before you start promoting them.
• When rankings drop: If you notice your positions in Google dropping, a technical SEO check is often the first thing to do to find the cause.

SEO tips based on common mistakes

After thousands of analyses, we see certain mistakes come up again and again. These are the most common SEO problems and how to fix them:

• Missing or overly long title tag: The title tag is the most important on-page ranking factor. Make sure every page has a unique title of 50-60 characters that contains your primary keyword.
• No meta description: Without a meta description, Google picks a snippet from your page itself. Write a compelling meta description of 120-160 characters for every page that invites people to click.
• Missing alt text on images: Alt text is needed for accessibility and helps search engines understand images. Briefly describe what the image shows.
• No HTTPS: HTTPS is a confirmed Google ranking factor. Install an SSL certificate (these are included for free at Theory7) and make sure all URLs redirect to HTTPS.
• Slow load time: Google measures Core Web Vitals as ranking factors. Optimize images, enable compression, use browser caching and minimize JavaScript and CSS.
• No structured data: Schema.org markup helps search engines understand your content and can lead to rich snippets. Add at least Article, FAQ or HowTo schema to relevant pages.