HTTPS Mixed Content Checker
Paste your HTML code to find insecure HTTP resources on HTTPS pages.
📖 Understanding Mixed Content and HTTPS Security
Mixed content is one of the most common security issues affecting HTTPS websites, and it can silently undermine the security you've worked to implement. When a webpage is served over a secure HTTPS connection but loads resources (images, scripts, stylesheets, fonts, or iframes) over insecure HTTP, you have a mixed content problem. This vulnerability can expose your users to man-in-the-middle attacks, compromise data integrity, and trigger security warnings that damage user trust.
Our HTTPS Mixed Content Checker scans your HTML source code to identify all external resources and classify them by protocol. Simply paste your page's HTML, and the tool instantly reveals which resources are secure, which are insecure, and which use relative URLs. This makes fixing mixed content issues fast and straightforward, helping you maintain a fully secure website that browsers trust and users feel safe visiting.
What Exactly Is Mixed Content?
When you visit a website using HTTPS (indicated by the padlock icon in your browser's address bar), you expect all communication between your browser and that website to be encrypted. However, if the HTTPS page includes resources loaded via plain HTTP, those specific requests are unencrypted and vulnerable to interception. This creates a "mixed" security situation where some content is protected and some isn't.
Types of Mixed Content
| Type | Resources Affected | Browser Behavior | Risk Level |
|---|---|---|---|
| Active Mixed Content | Scripts, stylesheets, iframes, XHR/Fetch requests, Web Workers | Blocked by default in all modern browsers | Critical - can execute code |
| Passive Mixed Content | Images, audio, video, fonts | Loaded with warnings (being phased out) | Moderate - content interception |
Why Mixed Content Matters
- Security Vulnerabilities: Attackers can intercept and modify insecure resources, potentially injecting malicious code or misleading content
- Browser Warnings: Modern browsers display "Not Secure" warnings or broken padlock icons when mixed content is detected
- Blocked Resources: Active mixed content (scripts, stylesheets) is blocked entirely, potentially breaking your website's functionality
- SEO Impact: Search engines consider HTTPS a ranking factor, and mixed content issues can negatively affect your site's perceived security
- User Trust: Security warnings erode user confidence, increasing bounce rates and reducing conversions
- Compliance Issues: Industries with data protection requirements (healthcare, finance) may have strict HTTPS enforcement policies
⚠️ Important: As of 2024, major browsers are increasingly strict about mixed content. Chrome and other browsers are moving toward blocking all mixed content, not just active content. Fixing mixed content issues is no longer optional—it's essential for a functioning, trustworthy website.