Web Project Testing & Security Audit Tools
Free online tools to check the security posture, SSL certificates, HTTP headers, open ports, and DNS propagation of any domain or server.
TypeOnline · No install
CostFree
Tools7 resources
SSL / TLS / Certificates
SSL Shopper — SSL Checker
Verifies the SSL certificate chain, expiration date, and installation errors
SSL Labs — SSL Server Test (Qualys)
Deep TLS analysis — assigns grade A+/A/B/F with protocol details and vulnerability breakdown
Full web security
Hardenize
Unified audit: SSL, DNS, email (SPF/DKIM/DMARC), and HTTP headers in a single report
Mozilla Observatory
Web security audit: CSP, secure cookies, HTTPS, subresource integrity — scored with actionable fixes
Security Headers
Analyzes and grades HTTP security headers: HSTS, X-Frame-Options, CSP, Permissions-Policy
Network / DNS
YouGetSignal — Open Port Checker
Checks whether a specific port is open and reachable from the internet on a given host
DNS Checker
Checks DNS record propagation (A, CNAME, MX, TXT) across global servers in real time
Free access — no sign-up required
7 tools