Free Security Tools
Five focused tools that let you check one thing at a time. Headers. SSL. Cookies. DNS. CSP. Each one runs instantly, returns actionable results, and costs nothing.
No signup. No email gate. No "free trial." Just paste a URL and get answers. Built for developers who ship fast and want to verify security without switching to a different workflow. Need the full picture? Run a 150+ check scan instead.
HTTP Security Header Checker
Instantly check which security headers your site uses. CSP, HSTS, X-Frame-Options, and more.
SSL/TLS Certificate Checker
Verify SSL certificate validity, expiry, protocol version, and issuer in seconds.
Cookie Security Analyzer
Inspect cookie flags: Secure, HttpOnly, SameSite. Find cookies that leak to attackers.
Content-Security-Policy Generator
Build a strong CSP header from a visual editor. Copy-paste ready for Nginx, Apache, and Next.js.
DNS Security Auditor
Audit SPF, DMARC, DKIM, CAA, MTA-STS, and TLS-RPT records to prevent email spoofing.
Why Use Security Tools?
Most security breaches exploit known misconfigurations, not zero-day exploits. A missing header or an expired certificate is low-hanging fruit for attackers. These tools help you find those gaps before someone else does.
Catch Misconfigurations Early
A single missing Content-Security-Policy header can open your site to cross-site scripting. An SSL certificate that expired yesterday breaks trust for every visitor. These are not edge cases. They are the most common attack vectors on the web. Run a quick check after each deploy and catch problems before your users do.
Verify Production Deployments
Your staging environment had perfect headers. But the CDN stripped them. The load balancer overwrote HSTS. The new deployment forgot the cookie flags. Production is a different beast. Verify what your real users actually receive, not what your config file says they should.
Meet Compliance Requirements
GDPR requires appropriate technical measures to protect personal data. The NIS2 directive mandates security hygiene for digital services across the EU. Proper security headers, encrypted connections, and secure cookie handling are baseline requirements. Not optional extras. These tools give you evidence that you meet them.
Improve SEO Rankings
Google has used HTTPS as a ranking signalsince 2014. Chrome flags sites without valid SSL as "Not Secure" in the address bar. Security headers like HSTS tell search engines your site takes protection seriously. Better security configuration directly translates to better visibility in search results and more trust from visitors.
How Our Tools Work
Different security checks require different approaches. Some need to talk to your server. Others run entirely in your browser. Here is how each category works.
Server-Side Scanning
The Header Checker, SSL Checker, and Cookie Analyzer send a request to your site from our servers. They inspect the actual response. Headers, certificates, and Set-Cookie directives. Exactly as a browser or attacker would see them.
Client-Side Analysis
The CSP Generator runs entirely in your browser. Nothing is sent to our servers. You configure directives visually, and it outputs a ready-to-use Content-Security-Policy header string. Safe for internal projects and air-gapped environments.
DNS Record Auditing
The DNS Auditor queries public DNS records to evaluate your email authentication setup. It checks SPF, DMARC, DKIM, CAA, and MTA-STS records, flagging misconfigurations that could let attackers spoof emails from your domain.
Security Tools vs. Full Scan
Both approaches have their place. The right choice depends on what you need right now.
Individual Tools
- Quick spot-checks. You just deployed a CSP change and want to verify it took effect. Run the header checker. Takes two seconds.
- Focused debugging. Chrome DevTools shows a cookie warning but you cannot figure out which flag is wrong. The cookie analyzer breaks it down.
- Building new configs. You need a CSP header for a new project. The generator lets you build one visually instead of guessing syntax.
- No email required. Results appear instantly on screen. Nothing is sent to your inbox.
Full 150+ Check Scan
- Full audit. Covers headers, SSL, cookies, DNS, open ports, OWASP Top 10, JavaScript CVEs, exposed files, and threat intelligence. All in one report.
- CVSS scoring. Each finding gets a severity score so you know what to prioritize. Critical issues float to the top.
- AI-generated report. Get a detailed breakdown with remediation steps, not just raw data. Delivered to your email.
- Pre-launch audits. About to go live? The full scan catches things individual tools miss. Exposed .env files, open database ports, leaked admin panels.
Frequently Asked Questions
Are these tools really free?
Yes. Every tool on this page is completely free to use with no limits. There is no signup, no email gate, and no trial period. We built them because developers deserve quick access to security checks without friction.
Do you store the URLs I check?
We do not store the URLs you check with individual tools. The CSP Generator runs entirely in your browser. Nothing leaves your machine. Server-side tools like the header checker and SSL checker process your request and discard the URL immediately after returning results.
What is the difference between individual tools and a full scan?
Individual tools focus on one specific area. Headers, SSL, cookies, DNS, or CSP. A full scan on the homepage runs 150+ checks across all categories including OWASP Top 10 detection, open port scanning, JavaScript CVE lookup, and threat intelligence feeds. Use individual tools for quick spot-checks and the full scan for a full audit.
How often should I check my security headers?
At minimum, check after every deployment that changes your server configuration. Many teams add header checks to their CI/CD pipeline. If you deploy weekly, a weekly check is reasonable. After major infrastructure changes (switching CDNs, updating web servers, or migrating hosts) always run a fresh check.
Can I automate these checks?
The individual tools are designed for manual, on-demand use. For automated checks, run a full scan from the homepage. You will receive a detailed report by email that you can integrate into your workflow. We are working on a CI/CD integration and API access for teams that need programmatic scanning.
Do you support scanning localhost or internal networks?
No. Our server-side tools need to reach your site over the public internet. The CSP Generator is the exception. It runs entirely in your browser, so you can use it for any project regardless of where it is hosted. For internal sites, consider running open-source tools like Mozilla Observatory or testssl.sh locally.
Which security headers matter most?
Content-Security-Policy and Strict-Transport-Security are the two highest-impact headers. CSP prevents cross-site scripting by controlling which scripts can execute. HSTS forces HTTPS connections and stops downgrade attacks. After those, prioritize X-Content-Type-Options, X-Frame-Options (or frame-ancestors in CSP), and Referrer-Policy.
My site got an F rating. What should I fix first?
Start with SSL/TLS. If your certificate is expired or misconfigured, nothing else matters. Next, add Strict-Transport-Security to enforce HTTPS. Then implement a Content-Security-Policy. Even a basic one blocks the most common XSS vectors. Fix cookie flags (Secure, HttpOnly, SameSite) last. Each step meaningfully reduces your attack surface.
Want to Learn More?
Security tools tell you what is wrong. Understanding tells you why it matters. Explore our learning library for in-depth guides written for developers.
HTTP Security Headers Explained
Guide to every security header: what it does, why it matters, and how to configure it correctly.
SSL/TLS Certificates: The Complete Guide
Certificate types, chain of trust, common misconfigurations, and how to debug SSL errors.
GDPR for Developers
What GDPR means for your code: cookies, consent, data storage, and the technical requirements you actually need to implement.
Pre-Launch Security Checklist
Everything to verify before going live. Headers, SSL, cookies, exposed files, and more.
Ready for a Complete Security Audit?
Individual tools catch individual problems. A full scan catches everything. OWASP Top 10, open ports, JavaScript CVEs, exposed files, threat intelligence, and more. 150+ checks in under a minute. Free.
Run Free Full Scan