What is an SEO scan?
An SEO scan is an automated check of your website against the technical and on-page signals search engines use to rank pages. It works by crawling your page the same way Googlebot does — reading the HTML, following links, measuring load time — and comparing what it finds against best practices.
The output is a score (usually 0–100) and a list of issues sorted by severity. A good SEO scan tool tells you not just what is wrong but why it matters and what to do about it.
SEO Snap: free SEO scan tool
What does an SEO scan check?
A thorough SEO scan covers every signal Google evaluates when deciding where to rank your page. Here are the 10 most important categories:
Meta tags
Title tag length, uniqueness, keyword use; meta description length and presence; H1 existence and count.
Page speed
Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), Total Blocking Time — the Core Web Vitals Google uses as ranking signals.
Mobile usability
Viewport meta tag, touch target sizing, font sizes, horizontal scroll — everything Google Mobile-Friendly Test checks.
Broken links
All internal and external links are tested for 404s, 500s, and redirect chains that waste crawl budget.
SSL & HTTPS
Whether your site uses HTTPS, whether the certificate is valid and not expired, and whether HTTP redirects correctly to HTTPS.
Schema markup
Validates JSON-LD structured data for FAQPage, Product, Article, BreadcrumbList — and flags missing required fields.
Canonical tags
Checks for missing, self-referential, or conflicting canonical tags that can cause duplicate content issues.
Image alt text
Every image without an alt attribute — both an accessibility violation and a missed ranking opportunity in image search.
Robots.txt & sitemap
Verifies your robots.txt is accessible, your sitemap is submitted, and no important pages are accidentally blocked from crawlers.
Open Graph tags
OG title, description, and image tags that control how your page looks when shared on social media and in AI chat.
How to run a free SEO scan (step by step)
- 1
Go to SEO-Snap
Open seo-snap.com. No account needed for your first free scan.
- 2
Enter your URL
Paste your homepage URL or any specific page you want to check — a product page, blog post, or landing page all work.
- 3
Click "Run Audit"
The scan runs in 30–60 seconds. You'll see a live progress indicator as each check completes.
- 4
Read your score and issues
Your overall SEO score (0–100) appears at the top, followed by category scores and a list of issues sorted by impact — critical issues first.
- 5
Fix issues in priority order
Each issue comes with a plain-English explanation of why it matters and a specific fix. Start with Critical, then Warnings, then minor issues.
What SEO score should you aim for?
Most new websites score between 40 and 65 on their first scan. A score below 50 usually means there are several critical issues — missing meta descriptions, no HTTPS, images without alt text — that are easy to fix and have an immediate impact on rankings.
Aim to clear all Critical issues first. Then work through Warnings. You don't need a perfect 100 — an 80+ score puts you ahead of the majority of competing pages.
SEO scan vs full SEO audit: what's the difference?
| Feature | SEO Scan | Full SEO Audit |
|---|---|---|
| Time to complete | 30–60 seconds | 2–5 minutes |
| Pages checked | One page | Whole site crawl |
| Technical checks | ✓ | ✓ |
| Content analysis | Basic | Deep |
| Backlink analysis | ✗ | ✓ (paid tools) |
| Keyword ranking | ✗ | ✓ (paid tools) |
| AI search visibility | ✓ (SEO-Snap) | ✓ (SEO-Snap) |
| Cost | Free | Free – $130+/mo |
The most common issues found in SEO scans
After running thousands of scans, these are the issues that appear most frequently — and that have the biggest impact on rankings when fixed:
Missing or duplicate meta descriptions
HighWrite a unique 120–160 character description for every page. Include the primary keyword naturally.
Title tag too long or missing
HighKeep titles under 60 characters. Lead with the target keyword. Make each page title unique.
No schema markup
MediumAdd JSON-LD for your page type (Article, Product, FAQPage). Unlocks rich results in Google.
Images missing alt text
MediumAdd descriptive alt attributes to all meaningful images. Use keywords where natural.
Slow page speed (LCP > 2.5s)
HighCompress images to WebP, defer non-critical JS, use a CDN. LCP is a direct ranking factor.
No canonical tag
MediumAdd <link rel="canonical"> to every page to prevent duplicate content penalties.
HTTP instead of HTTPS
CriticalInstall an SSL certificate and redirect all HTTP traffic to HTTPS. Google marks HTTP sites as "Not secure".
How often should you scan your website?
At minimum, run an SEO scan once a month. In practice, any of these events should trigger an immediate scan:
- You publish new pages or blog posts
- You update your site design or CMS theme
- You migrate to a new domain or hosting provider
- Your Google traffic drops unexpectedly
- You add or remove a plugin that touches meta tags or redirects
Sites on SEO-Snap's paid plans get automated weekly scans — the tool runs automatically and emails you if new issues appear, so you catch problems before they affect rankings.