A website SEO checker helps you understand how well-optimized a website is for search engines. Whether you're auditing your own site or analyzing a competitor's, checking SEO performance is the foundation of any growth strategy.
In this guide, we'll show you how to perform a complete SEO audit using only free tools—covering traffic analysis, domain authority, on-page SEO, technical SEO, and organic performance.
The Complete Free SEO Audit Framework
A thorough website SEO check covers five areas:
| SEO Area | What to Check | Free Tool |
|---|---|---|
| Traffic & Authority | Monthly visitors, domain authority, global rank | SiteWorthIt |
| Organic Keywords | Which keywords drive traffic | Google Search Console |
| On-Page SEO | Title tags, meta descriptions, headings, content | Browser DevTools |
| Technical SEO | Page speed, mobile-friendly, crawlability | PageSpeed Insights |
| Backlinks | Number and quality of inbound links | Ahrefs Free / SiteWorthIt |
Step 1: Check Traffic & Domain Authority
Start with the big picture. Use SiteWorthIt's free analyzer to get:
- Estimated monthly traffic — how many visitors the site gets
- Domain authority score — the site's overall SEO strength
- Global ranking — how popular the site is worldwide
- Revenue estimate — estimated earnings from traffic
- Backlink estimate — number of sites linking to it
For competitor analysis, use the comparison tool to benchmark two sites side-by-side.
Step 2: Analyze Organic Traffic Sources
Understanding where organic traffic comes from tells you what's working:
- Your own site: Use Google Search Console to see exact keywords, clicks, and impressions
- Competitor sites: Use SiteWorthIt for estimated traffic + Semrush's 10 free daily queries for keyword data
Key metrics to look at for organic traffic:
- Which pages drive the most organic traffic?
- Which keywords have the highest impressions but low CTR? (Optimization opportunity!)
- Are there keywords ranking on page 2 that could be pushed to page 1?
Step 3: On-Page SEO Checklist
On-Page SEO Essentials
- Title tag — unique, includes target keyword, under 60 characters
- Meta description — compelling, includes keyword, under 160 characters
- H1 heading — one per page, includes primary keyword
- H2/H3 headings — logical structure, include related keywords
- Image alt text — descriptive, includes keywords where natural
- Internal links — link to related pages on your site
- URL structure — short, descriptive, includes keyword
- Content quality — comprehensive, original, answers user intent
- Schema markup — structured data for rich snippets
Step 4: Technical SEO Check
Technical issues can tank your rankings even with great content. Check these with free tools:
Page Speed (PageSpeed Insights)
Enter your URL at pagespeed.web.dev. Aim for 90+ on mobile. Focus on LCP, FID, and CLS metrics.
Mobile Friendliness
Google uses mobile-first indexing. Test with Chrome DevTools' device emulation mode.
Crawlability (robots.txt)
Check yoursite.com/robots.txt — make sure important pages aren't blocked.
Sitemap
Verify yoursite.com/sitemap.xml exists and is submitted to Google Search Console.
HTTPS Security
Your site must use HTTPS. Check for mixed content warnings in browser console.
Broken Links
Use free tools like Dead Link Checker or Screaming Frog (free up to 500 URLs) to find 404 errors.
Step 5: Backlink Analysis
See our complete free backlink checker guide for detailed strategies. Quick checks:
- Use SiteWorthIt to see estimated backlink counts and domain authority
- Use Ahrefs' free backlink checker for top 100 linking domains
- Use Google Search Console for your own site's complete link data
Free SEO Checker Tools Summary
| Tool | Best For | Free Limit |
|---|---|---|
| SiteWorthIt | Traffic, authority, revenue, rankings | Unlimited |
| Google Search Console | Your own site's keywords & performance | Unlimited (own site) |
| PageSpeed Insights | Page loading speed & Core Web Vitals | Unlimited |
| Ahrefs Free Tools | Top 100 backlinks, basic keyword ideas | Limited queries |
| Screaming Frog | Technical SEO crawl | 500 URLs |
| Schema Markup Validator | Structured data testing | Unlimited |
Your 15-Minute SEO Audit Workflow
- 2 min: Check traffic & authority on SiteWorthIt
- 2 min: Run the free SEO Checker for instant on-page audit
- 2 min: Compare against top competitor
- 3 min: Run Speed Checker for performance scores and Core Web Vitals
- 3 min: Check on-page SEO (title, meta, headings, images)
- 3 min: Review Google Search Console for keyword opportunities
Frequently Asked Questions
What is a website SEO checker?
A website SEO checker is a tool that analyzes a website's search engine optimization, including on-page factors (titles, meta descriptions, headings), technical SEO (page speed, mobile-friendliness), and authority signals (backlinks, domain authority). SiteWorthIt's free SEO Checker covers all these areas in one scan.
How do I check my website's SEO score for free?
Use SiteWorthIt's free SEO Checker. Enter any URL to get an instant SEO score covering on-page optimization, technical factors, and social signals—no sign-up required. For deeper analysis, combine it with Google Search Console for keyword data.
What is a good SEO score?
A good SEO score is 70 or above out of 100. Scores of 40–69 indicate room for improvement, while scores below 40 suggest significant SEO issues. Focus on fixing "fail" items first—they have the biggest impact on rankings.
How often should I check my website's SEO?
Run a major SEO audit at least monthly. Check key metrics (page speed, crawl errors) weekly. After significant content or technical changes, run an SEO check immediately to verify nothing broke.
Can I check a competitor's SEO?
Yes. SiteWorthIt's SEO Checker works on any URL—your own site or any competitor. You can audit their on-page SEO, check their page speed, and analyze their domain authority for free.
Free SEO Tools from SiteWorthIt
Use these free tools for a complete SEO audit:
- SEO Checker — instant on-page SEO audit with pass/warn/fail scoring
- Speed Checker — Core Web Vitals and performance scores powered by Google PageSpeed
- Domain Authority Checker — trust, content, technical, and social authority breakdown
- Backlink Checker — analyze backlink profiles and referring domains
- Keyword Checker — discover organic keywords driving traffic
- Rank Checker — global website popularity ranking