How to Check if a Website Is Secure: 7 Quick Tests Anyone Can Do

• Data theft — stolen credit cards, passwords, personal information
• Phishing — fake sites that look legitimate
• Malware — drive-by downloads and cryptojacking
• Identity fraud — stolen credentials used to impersonate you

Here are 7 tests anyone can perform, right now, without installing anything.

Test 1: Check the Padlock (HTTPS)

What to look for: A padlock icon in your browser's address bar, and a URL that starts with https://.

What it means: The connection between your browser and the website is encrypted. Data you send (passwords, credit card numbers) cannot be intercepted.

Red flags: - "Not Secure" warning in the address bar - URL starts with http:// (no "s") - Browser shows a certificate error or warning page

Important: HTTPS alone does not mean a site is trustworthy — phishing sites can have HTTPS too. But the absence of HTTPS is a definite red flag.

Test 2: Inspect the SSL Certificate

Click the padlock icon, then "Connection is secure" or "Certificate" to view details.

Check for: - Issuer — Should be a recognized Certificate Authority (Let's Encrypt, DigiCert, Comodo) - Expiry date — Certificate should not be expired - Domain match — Certificate should match the domain you are visiting - Certificate type — EV (Extended Validation) certificates show the organization name

Test 3: Look for Security Headers

Open your browser's developer tools (F12), go to the Network tab, click on the main page request, and check the Response Headers.

Good signs: - Strict-Transport-Security present — forces HTTPS - Content-Security-Policy present — prevents XSS - X-Content-Type-Options: nosniff — prevents MIME-type attacks - X-Frame-Options: DENY — prevents clickjacking

No headers at all? The site has not implemented basic security protections.

Test 4: Run a Security Scanner

The fastest and most comprehensive approach. A security scanner automatically checks dozens of security configurations in seconds.

How to do it: 1. Visit ZeriFlow 2. Enter the website URL you want to check 3. Get a detailed security report in about 60 seconds

The report shows a score out of 100 and breaks down findings across SSL/TLS, headers, cookies, DNS, email security, and more, with specific recommendations for each issue.

Test 5: Check for Mixed Content

Mixed content occurs when an HTTPS page loads resources (images, scripts, stylesheets) over insecure HTTP.

How to check: 1. Open Developer Tools (F12) 2. Go to the Console tab 3. Look for warnings like "Mixed Content: The page was loaded over HTTPS, but requested an insecure resource"

Mixed content weakens HTTPS because an attacker can modify the insecure resources.

Test 6: Test the Login Page

If the site has a login form, check these security basics: - Is the login page on HTTPS? (it must be) - Does it lock you out after too many failed attempts? - Does it support two-factor authentication? - Does the "forgot password" flow seem secure? (no password sent in plain text)

Test 7: Check the Privacy Policy and Cookie Notice

A legitimate, security-conscious website will have: - A privacy policy explaining what data is collected and how it is used - A cookie consent banner (required by GDPR in Europe) - An option to opt out of non-essential tracking - Contact information for the data protection officer or responsible party

Red flags: - No privacy policy at all - Privacy policy is copy-pasted gibberish - No way to refuse non-essential cookies - Site collects excessive personal data for its purpose

Quick Reference Card

What to Do if a Website Fails These Tests

• Do not enter personal information on sites without HTTPS
• Avoid making purchases on sites with certificate errors
• Report suspicious sites to Google Safe Browsing
• Contact the website owner if it is a service you need to use
• If it is your own website, run a full security scan and follow the recommendations

Conclusion

Checking if a website is secure does not require technical expertise. The 7 tests above can be performed by anyone with a web browser. For a comprehensive, automated check, use a security scanner like ZeriFlow to get a detailed breakdown in seconds.

Stay safe online.

Further Reading

• Mozilla SSL Configuration Generator
• RFC 8996 — Deprecating TLS 1.0 and TLS 1.1

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