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Website SEO Analyzer

Analyze any webpage for SEO readiness. Get a letter grade, 25+ checks across 5 categories, and actionable recommendations - free, no sign-up.

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Complete the CAPTCHA once per analysis to help prevent abuse.
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Enter a URL to start your SEO audit
Checks 25+ SEO factors across 5 categories and gives you a letter grade with actionable tips.
✓ On-Page SEO✓ Content✓ Technical✓ Performance✓ Social

About Website SEO Analyzer — Website SEO Analyzer Online

This website SEO analyzer online checks any public webpage against 25+ SEO best practices and returns a letter grade (A–F) plus detailed, category-by-category results. It covers On-Page SEO, Content quality, Technical signals, Performance hints, and Social and Indexability factors. Every failed or warned check includes a specific, actionable recommendation so you know exactly what to fix and why it matters. Content creators, developers, SEO consultants, and small business owners use it to quickly audit pages without the cost of enterprise SEO platforms.

Getting indexed and ranked by Google requires more than good content — it requires proper meta tags, correct heading structure, fast-loading HTML, valid Open Graph tags for social sharing, and clear signals to crawlers about what to index and what to ignore. A website SEO analyzer online puts all of those checks in one place and grades them, giving you a prioritized fix list rather than a wall of raw metrics to interpret. Because analysis runs in your browser after fetching the page HTML, there's nothing to install and no account to create.

How to Use the Website SEO Analyzer

  1. Paste any public URL into the input bar — for example, https://example.com/blog/my-article. Both HTTP and HTTPS URLs are supported.
  2. Click Analyze. The tool fetches the page HTML via a CORS proxy and runs all 25+ checks in your browser.
  3. Review your overall letter grade and the five category grades shown in the summary section.
  4. Expand each category panel to see individual check results marked Pass, Warn, or Fail — each with a specific recommendation.
  5. Click Download Report to save a self-contained HTML report, or Copy Report for plain text you can paste into a document or email.

What the Analyzer Checks

The tool evaluates your page across five weighted categories, each targeting a different dimension of search engine optimization.

  • On-Page SEO: Title tag presence and length (50–60 characters is ideal), meta description presence and length (150–160 characters), H1 uniqueness and presence, H2 subheading structure, canonical tag, HTML lang attribute, robots meta tag, and URL length. These are the foundational signals search engines use to understand what a page is about.
  • Content: Estimated word count (thin content below 300 words is a ranking risk), image alt text coverage, internal link count, and keyword consistency between the title and H1. Strong content signals indicate a page is a genuine resource rather than a thin landing page.
  • Technical: Viewport meta tag for mobile compatibility, Open Graph tags (og:title, og:description, og:image), JSON-LD structured data presence, favicon, HTTPS protocol, and raw HTML page size. Technical checks catch issues that affect crawlability and correct rendering.
  • Performance Hints: Inline script count, inline style count, and render-blocking stylesheet placement. These are HTML-level indicators of frontend performance — not substitutes for Lighthouse, but fast to check without rendering the page.
  • Social and Indexability: Twitter Card meta tags, og:image for rich social previews, and sitemap reference in the page. These signals affect how the page appears when shared on social platforms and whether crawlers can discover related pages.

Tips for Getting the Best Results

Getting the most from the SEO analyzer requires understanding how to read the results and which issues to prioritize fixing first.

  • Focus on Fail items before Warn items: The scoring model gives zero points for Fail checks and half points for Warn checks. Fixing a Fail has twice the impact on your score as fixing a Warn. Start with red Fail items — missing title tags, absent meta descriptions, no H1 — before addressing yellow warnings like slightly long titles or missing structured data.
  • Analyze your most important pages first: Your homepage, top landing pages, and highest-traffic blog posts have the most to gain from SEO improvements. Run the analyzer on those pages first, fix issues, then work through lower-traffic pages.
  • Re-analyze after making changes: Use the Re-analyze button to fetch a fresh copy of the page after you've deployed fixes. Browser caching can sometimes show stale content, so a hard refresh or using Re-analyze ensures you're checking the latest live version.
  • Compare your score against competitors: Analyze a competitor's top-ranking page on the same topic and compare category grades. If their Technical score is B+ and yours is C, that's a clear signal about where to invest improvement effort.
  • Download reports for client or team sharing: The downloaded HTML report is self-contained and opens in any browser without internet access. Use it to document current SEO status, share a fix list with a developer, or present a before/after comparison to a client after implementing recommendations.

Why Use a Website SEO Analyzer Online

Professional SEO platforms like Ahrefs, SEMrush, and Moz provide comprehensive analysis but require subscriptions starting at $99–$199 per month. For a quick on-page audit of a single page, a website SEO analyzer online delivers the critical checks — title, meta, heading structure, canonical, Open Graph, structured data — in seconds at no cost. Because it runs in your browser, there's no API key to configure, no rate limits to worry about, and no account data to manage.

This tool is ideal for freelance web developers auditing client sites before launch, bloggers checking new posts before publishing, small business owners doing a first-pass SEO health check, and SEO consultants who need a fast gut-check before diving into a full crawl. It won't replace a full site crawl for large domains, but for page-level audits it's the fastest path from URL to actionable fix list.

Frequently Asked Questions about Website SEO Analyzer

Some websites block cross-origin requests, require authentication, or use JavaScript rendering that a static HTML fetch cannot see. The tool uses a public CORS proxy (allorigins.win) to fetch pages — sites that return a 403, 401, or block external requests will show an error. If analysis fails, check that the URL is publicly accessible without login, try removing query parameters, or test with a different page on the same site.
Each check carries a weight proportional to its SEO impact. A passing check earns full points, a warning earns half points, and a fail earns zero. The overall score is the weighted sum expressed as a 0–100 scale, then mapped to a letter grade: A (90+), B (75–89), C (55–74), D (35–54), F (below 35). Category grades follow the same formula applied to the checks within each category.
Not directly — measuring real performance metrics like LCP, FID, and CLS requires a browser to render the page with all its assets, which a server-side HTML fetch cannot do. The tool checks HTML-level performance hints like inline script count, inline style count, and raw HTML file size, which are useful indicators but are not substitutes for Google PageSpeed Insights or Lighthouse. For Core Web Vitals, run a Lighthouse audit after using this tool.
Yes. After analysis completes, click Download Report to save a self-contained HTML file with all check results, category grades, and recommendations. The file opens in any browser without internet access. To create a PDF version, open the downloaded file in your browser and use File → Print → Save as PDF. This is useful for sharing results with clients or keeping a before/after record of improvements.
No data is stored on any Oneyfy server. The URL is sent to a public CORS proxy (allorigins.win) solely to fetch the page HTML — Oneyfy does not log or store the URLs you analyze. The HTML parsing and all 25+ checks run entirely in your browser. Once the page closes, the analysis results are gone. For the proxy's own privacy policy, see allorigins.win.
Yes, completely free. There are no usage limits, no sign-up required, and no paid tiers. You can analyze as many URLs as you like. The tool is ad-supported on the Oneyfy site, but all SEO analysis functionality — including the downloadable report — is fully available at no cost.
Yes. The analyzer interface is fully responsive. You can paste a URL and run an analysis on a mobile browser. The results panels are scrollable and readable on narrow screens. However, for detailed review of per-check recommendations and comparing multiple pages side by side, a desktop browser provides a more comfortable experience.
Only partially. The tool fetches the raw HTML returned by the server and parses that. For server-side rendered pages (Next.js with SSR, WordPress, static HTML sites), this captures the full content. For client-side SPAs (React, Vue, Angular without SSR), the fetched HTML may be a minimal shell, and checks like word count and heading structure will reflect only the pre-render content. For SPA SEO analysis, use Google Search Console's URL Inspection tool or a headless browser crawler.