Free Mixed Content Checker
Free tool
Scans HTTPS pages for HTTP scripts, images, iframes, and protocol-relative URLs that browsers block or flag. Pinpoints each offender with step-by-step fixes.
- HTTP resource detection
- Browser compatibility check
No credit card requiredProduction-safe (100% passive)No setup or code required
Trusted by 4,500+ security & engineering teams
What you get for free
18 core security checks via this tool, passive scans, step-by-step remediation, security score on every result.
What Essential adds at $39/mo
+17 advanced checks, continuous monitoring, daily security score history, email alerts, GitHub SAST, board-ready PDFs, SOC 2 / ISO 27001 / PCI reports.
What this checker validates
- HTTP resource detection on HTTPS pages
- Browser compatibility and blocking behavior
- Protocol-relative URL analysis
- Third-party resource validation
What is mixed content?
Mixed content occurs when an HTTPS page loads resources (images, scripts, stylesheets, iframes) over HTTP. Modern browsers block or degrade these requests, breaking functionality and compromising security.
How to fix mixed content
- Replace all
http://URLs withhttps:// - Update CDN and library URLs to HTTPS versions
- Fix hardcoded links in templates, CSS, and JavaScript
- Use CSP
upgrade-insecure-requestsas temporary mitigation
Implementation examples
Once you've identified the gap, applying the fix is straightforward. Here are the three configurations developers reach for most often.
Nginx
add_header Content-Security-Policy "upgrade-insecure-requests; block-all-mixed-content" always;Apache
Header always set Content-Security-Policy "upgrade-insecure-requests; block-all-mixed-content"Node.js (Express + Helmet)
app.use(
helmet.contentSecurityPolicy({
directives: {
upgradeInsecureRequests: [],
blockAllMixedContent: [],
},
}),
)Tool-specific questions
Why do browsers block mixed content?
Browsers block mixed content to prevent man-in-the-middle attacks where HTTP resources could be modified in transit, compromising the security of the HTTPS page.
What's the difference between active and passive mixed content?
Active mixed content (scripts, stylesheets, iframes) is blocked completely, while passive mixed content (images, audio, video) is allowed but shows warnings. Both should be fixed.
Can I use protocol-relative URLs (//example.com)?
Avoid protocol-relative URLs as they can pull HTTP from legacy hosts. Instead, explicitly use https:// URLs for all resources.
How does CSP upgrade-insecure-requests help?
The upgrade-insecure-requests directive tells browsers to try HTTPS for HTTP resources, but it only works if the resource server supports HTTPS. Use it as a temporary bridge while fixing sources.
What if a third-party service doesn't support HTTPS?
Contact the service provider to request HTTPS support, or find an alternative service that supports HTTPS. Never rely on mixed content for production websites.
Why Barrion
Built for the engineers who already have enough to fix.
Speed
Real-time results
Instant analysis with a detailed report. You see findings as the scan runs, not after.
Coverage
Comprehensive checks
35+ checks per scan covering TLS, headers, CORS, cookies, DNS, email auth, and more, in a single pass.
Action
Step-by-step fixes
Every finding ships with the exact remediation step for your framework. Hand it to the engineer who owns the surface.
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FAQ
Frequently asked.
What is Barrion and how does it enhance website security?
Barrion is a security testing and monitoring platform for engineering teams, and it works in three ways. Passive scanning keeps a continuous, read-only watch over your live web apps and APIs. Codebase scanning connects to GitHub and checks your code for hard-coded secrets, insecure patterns and vulnerable dependencies. AI pentesting goes on the offensive, running agent-driven attacks that prove which vulnerabilities are genuinely exploitable. Every finding comes with a step-by-step fix you can ship right away.
How safe is Barrion to use for security testing?
Passive scanning and codebase scanning are completely safe to run, including against production. Passive scans only read your live app, so we never submit forms, brute-force endpoints or touch anything that changes state, and codebase scanning just reads your repository. AI pentesting is more aggressive by design, since its job is to confirm real exploits, so it runs rate-limited and non-destructive, and you agree the scope with us before it starts.
What types of security issues does Barrion identify?
It depends on the surface. On your live apps, Barrion catches misconfigurations across TLS and HTTPS, security headers, cookie flags, CORS policy, DNS records, email authentication (SPF, DKIM, DMARC), network exposure and the usual web hygiene gaps. In your codebase it finds secrets committed to the repo, insecure code patterns and vulnerable dependencies. AI pentesting surfaces the exploitable stuff, like SQL injection, cross-site scripting and broken access control, each one backed by proof it can actually be exploited.
What specific security checks does Barrion perform?
For live apps it checks TLS and HTTPS configuration, HTTP security headers, cookie flags, CORS policy, DNS and email authentication records, network exposure and common web hygiene issues. In your codebase it looks for hard-coded secrets, insecure patterns and vulnerable dependencies. AI pentesting takes it further by actively chaining requests to confirm exploitable flaws. Whatever the source, findings are ranked by severity and come with clear, step-by-step remediation.
What is Barrion's smart crawling?
Smart crawling automatically discovers the pages and endpoints of your app so scans cover the surface that matters, without you manually listing every URL.
How often does Barrion perform security scans?
You can run a scan manually whenever you want. Continuous monitoring of your live apps runs on its own (weekly and up on Essential, daily on Business), codebase scans can fire on every commit or pull request, and we alert you the moment something new shows up.
Is Barrion suitable for security testing of all business sizes?
Yes. Live-app monitoring, codebase scanning through GitHub and AI pentesting all work just as well for a solo developer as for a startup, a scale-up or an enterprise security team, without adding headcount.
How does Barrion handle data security and privacy during security testing?
Live-app and codebase scans are read-only by default, and we never store or expose sensitive data from your application. AI pentests are rate-limited and non-destructive, built to confirm whether something is exploitable without altering your data or affecting availability.
What if I'm not satisfied with Barrion's security testing service?
Paid plans start with a free trial, and you can cancel anytime. If something isn't right, contact us and we'll make it work for your team.
How does Barrion help with SOC 2, ISO 27001, NIS2, and other compliance frameworks?
Barrion produces audit-ready PDF and CSV reports suitable for SOC 2, ISO 27001, PCI DSS and NIS2, ready to share with auditors, customers and your board.
Anything else? Email contact@barrion.io.
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