Free Website Security Checker: Scan Your Site in 60 Seconds

You don't need to be a target to have a security problem — most website security issues are quiet misconfigurations, not dramatic breaches. A missing header here, an expired certificate there, an email domain anyone can spoof. Individually small; together, they're the difference between a site browsers and customers trust and one they quietly warn people away from.

A website security checker finds those gaps in seconds by inspecting what's already public: your HTTPS setup, your response headers, your DNS records. This guide covers exactly what to check, why each one matters, and how to check your whole site for free.

What a website security checker actually checks

You can't test another site's internal code from the outside — but a huge share of real-world security posture is externally observable. Here's what a good checker inspects and why.

1. SSL / TLS certificate

The foundation. A checker confirms your certificate is valid, not expired, issued for the right domain, and using a modern protocol. An expired or mismatched certificate throws a full-page browser warning that sends visitors running — and it's entirely preventable.

Check it free with the SSL Checker.

2. HTTP security headers

Headers are cheap to add and disproportionately protective. The ones that matter most:

• Strict-Transport-Security (HSTS) — forces HTTPS, preventing downgrade attacks.
• Content-Security-Policy (CSP) — your strongest defense against cross-site scripting (XSS).
• X-Content-Type-Options: nosniff — stops MIME-type confusion attacks.
• X-Frame-Options — blocks clickjacking by controlling who can iframe your site.
• Referrer-Policy and Permissions-Policy — limit what leaks and what features run.

Most sites are missing at least two of these. They cost nothing but a config line each.

Deep dive: Security Headers Implementation Guide.

3. Email authentication (SPF, DKIM, DMARC)

Your website's domain is also your email domain, and without the right DNS records, anyone can send email that looks like it's from you — phishing your customers, wrecking your deliverability. A checker verifies:

• SPF — which servers may send mail for your domain.
• DKIM — a cryptographic signature proving the mail is really yours.
• DMARC — the policy that ties them together and tells receivers what to do with fakes.

Check it free with the Email Security Checker, and read the SPF/DKIM/DMARC guide.

4. DNSSEC

DNSSEC signs your DNS records so attackers can't quietly redirect your domain via DNS spoofing. It's still under-adopted — a checker will tell you whether yours is enabled.

5. Mixed content, cookies & reputation

The finishing checks: is a HTTPS page loading any HTTP assets (which browsers block or flag)? Are your cookies set with Secure and HttpOnly? Is the URL clean according to Google Safe Browsing (no malware or phishing flags)? Each is a small signal that adds up to whether a browser — and a visitor — trusts you.

How to check your whole site's security for free

You can test each item individually with the free tools linked above. To check them all at once, run a free WebScore scan: the Security module inspects SSL, headers, SPF/DKIM/DMARC, DNSSEC, mixed content, cookies and Safe Browsing together, gives you a security grade, and — importantly — hands you a prioritized, step-by-step fix for every issue it finds, not just a red X.

Because most website security problems are configuration gaps, the report usually reads less like a threat assessment and more like a short to-do list you can clear in an afternoon.

The takeaway

A website security checker turns invisible misconfigurations into a concrete checklist: valid SSL, the key security headers, SPF + DKIM + DMARC, DNSSEC, no mixed content, safe cookies, clean reputation. None of it requires a security team — most are one-line fixes — but skipping them is exactly how ordinary sites end up with browser warnings, spoofed email, and lost trust.

Run a free security scan and see your grade — plus every fix — in about 60 seconds.