Free website health check · No signup
Free Website Health Check
Your uptime monitor says you're up — but is your site actually working? Run a free website health check to find broken assets and links, mixed content, missing security headers, expiring SSL, domain expiry, failing third-party dependencies, and an accidental robots.txt block — in 20 seconds.
How the scan works
- 1
Paste your URL
Enter any publicly accessible URL above. No signup or account needed.
- 2
We run the full check suite
Assets, links, SSL, domain expiry, security headers, third-party health, schema, SEO meta, robots.txt, mixed content, and silent-breakage checks — in about 20 seconds.
- 3
Get a prioritized report
Findings ranked by severity with plain-English explanations — what's broken, who sees it, and why it matters.
Sample output
Here's what a scan of a real e-commerce site found
Their uptime monitor was green the entire time.
2 broken images
Visitors see empty boxes where product photos should be
Mixed content: HTTP resource on HTTPS page
Browsers block it and show a broken-lock warning
SSL certificate expires in 23 days
Site will go offline if not renewed in time
What the health check covers
Broken assets
Images, scripts, and stylesheets that 404, 403, or fail to load.
Mixed content
HTTP resources loaded on HTTPS pages that browsers block and that break the lock icon.
SSL certificate
Validity, issuer, and days until expiry — catch a renewal before your site goes dark.
Security headers
CSP, HSTS, X-Frame-Options, Referrer-Policy — the headers enterprise audits look for.
Schema & SEO
Invalid JSON-LD, missing canonicals, Open Graph gaps that tank shares and rich results.
Discoverability
Robots.txt (including an accidental site-wide Disallow: /), sitemap.xml, and whether your site is actually indexable.
Domain expiry
How many days until the domain registration lapses — catch it before the site goes dark.
Broken links
Hyperlinks pointing at 404s and dead destinations that frustrate visitors and waste crawl budget.
Third-party dependencies
CDNs, font hosts, analytics, and widgets your page depends on — flagged when one is down.
Silent breakage
Redirect loops, MIME-type mismatches, and pages returning JSON or plain text when they should be HTML — silent breakage that makes a "working" site unusable.
How it compares
Sitewatch and Lighthouse solve different problems. Use both.
| Check | Sitewatch | Lighthouse | Uptime tools |
|---|---|---|---|
| Broken images & scripts | Yes | Partial | No |
| Mixed content | Yes | Yes | No |
| SSL certificate expiry | Yes | No | Some |
| Security headers (CSP, HSTS) | Yes | Partial | No |
| Schema / JSON-LD validation | Yes | No | No |
| Silent content failures | Yes | No | No |
| Performance scores (LCP, CLS) | Coming | Yes | No |
Frequently asked questions
- What does a free website health check include?
- We check SSL, domain expiry, security headers, broken assets, broken links, mixed content, third-party dependency health, schema markup, SEO meta tags, robots.txt (including an accidental site-wide Disallow: /), and sitemap.xml. We also catch silent failures most tools miss: redirect loops, MIME-type mismatches, and pages returning JSON or plain text instead of HTML.
- Is this website health check really free?
- Yes. No signup, no email gate, no credit card. You get the full results immediately. We offer it free because it demonstrates what Sitewatch monitors continuously on paid plans.
- How is this different from Google Lighthouse or PageSpeed Insights?
- Lighthouse focuses on performance scores and best practices. Sitewatch focuses on things that break silently after deploys: 404-ing assets, mixed content, expiring SSL, missing security headers, and invalid structured data. They complement each other — Lighthouse for performance, Sitewatch for integrity.
- How long does the scan take?
- Most scans complete in 10–25 seconds. We load your page, enumerate all subresources, check each one, validate schema and headers, and compile the findings into a prioritized report.
- Is my data safe?
- We only scan publicly accessible pages. We don't store your page content — just the findings. Results are available via a shareable link for 30 days, then automatically deleted.
- How is this different from an uptime monitor?
- Uptime monitors check if your server responds. Sitewatch checks if your site actually works — whether images load, scripts execute, schema is valid, and security headers are present. A site can be "up" but completely broken for visitors.