HTTPS Checker - Verify Real Security

What Is an HTTPS Checker?

An HTTPS Checker explains what your browser can actually establish about this page's connection. It reads the page's protocol and isSecureContext status, then looks for HTTP resource references in page markup, available Resource Timing entries, and relevant Content Security Policy events. Unlike a remote SSL scanning service, it does not request another website or pretend to know certificate metadata that webpage JavaScript cannot access.

How to Use the HTTPS Checker

1. Open this page directly. The first scan runs automatically. The results apply only to the page containing this checker, not an arbitrary URL.
2. Read Page Protocol and Secure Context. HTTPS is the expected protocol for a public website. Secure Context shows how the browser classifies the current page; on local development hosts, HTTP may still be considered trustworthy for some APIs.
3. Review HTTP Resource References. Open any listed entries and inspect the associated evidence: page markup, Resource Timing URL, or a Content Security Policy event. A reference is a warning to investigate, not proof that the resource crossed the network without encryption.
4. Use Re-check after a page loads additional resources. To retain the visible snapshot, choose Copy Report or Download JSON. Reports are created in the browser; the download includes observable URL paths but omits query strings and fragments.
5. Confirm details in browser DevTools. Open the Console for mixed-content warnings and the Network/Security panels for actual requests and certificate details. For another website, open that site directly and check its own connection information.

How It Works

The protocol value comes from location.protocol. The secure-context result comes from window.isSecureContext. They are related but not interchangeable: a local http://localhost page can count as a trustworthy origin for browser API purposes without encrypting its HTTP connection.

For HTTP resource references, the tool examines selected resource-loading attributes (such as image or script sources), the URLs available in performance.getEntriesByType('resource'), and HTTP URLs reported by CSP violation events that occur after initialization. It deduplicates identical full URLs locally and displays their host and path without query strings. Normal links to other pages are not counted as mixed content, because navigating to another page is not the same as embedding an insecure subresource.

Browsers may automatically upgrade certain HTTP image/audio/video requests to HTTPS and block other insecure subresource requests, especially scripts or stylesheets. Some blocked requests never appear in Resource Timing. Therefore a visible HTTP URL is not definitive evidence of an insecure network transfer, and zero findings do not certify that every request was secure.

Understanding Your Results

• HTTPS + Secure Context: Yes. The page URL uses HTTPS and the browser treats this page as a secure context. This alone does not prove the operator is trustworthy or the site is free from vulnerabilities.
• HTTP + Secure Context: No. The main page is not protected by HTTPS; avoid entering passwords, payment details or other sensitive information.
• HTTP + Secure Context: Yes. Often a development environment such as localhost. A trustworthy browser origin classification does not mean HTTP is encrypted.
• One or more HTTP references. Inspect each reported URL in DevTools; the browser may have upgraded or blocked it. Treat this result as a review warning, not an automatic FAIL.
• Zero HTTP references. None were found in the available inspection surfaces. Dynamic requests, frame internals, incomplete timing buffers and earlier CSP warnings can still be missed.
• TLS Certificate Details: Unavailable. Ordinary page scripts cannot safely inspect the certificate's issuer, expiry date, chain or cipher details.

Browser Limitations

This checker makes no extra network request to test another URL. The inspection and report generation run locally; copying or saving a report is initiated only by you. A report contains the page hostname and observed resource URL paths, so review it before sharing. Embedded cross-origin frames, certain service worker behavior, the browser's resource timing buffer, and security features can all limit what JavaScript sees. Certificate information and authoritative request-level mixed-content warnings belong in the browser's built-in connection viewer or developer tools.

Common Mistakes to Avoid

• HTTPS means a trustworthy company: false. HTTPS protects transport; it cannot determine whether the page is fraudulent or malicious.
• An HTTP reference means unencrypted data was downloaded: not necessarily. Modern browsers may upgrade or block such requests.
• Zero findings means no mixed content anywhere: not guaranteed; this is a limited on-page inspection, not an exhaustive site crawl.
• A local HTTP site marked secure means encryption: false. Browser secure-context classification and encryption are different concepts.

Frequently Asked Questions

Conclusion

Use this checker as a transparent first look at your current page's HTTPS and secure-context status plus observable insecure-URL references. For a deeper security diagnosis, confirm the findings using browser DevTools and the certificate viewer. You can also try the Secure Context Checker for a focused view of browser API security requirements.