Free
Passwords & IDs · Security
Generate strong, random passwords free from 1Password.
passwordsgeneratorrandom
Browse the complete directory — use filters to narrow down.
Passwords & IDs · Security
Generate strong, random passwords free from 1Password.
SSL & TLS · Security
Search certificate transparency logs for any domain.
Headers & CSP · Security
Google's tool to evaluate and debug Content Security Policies.
Passwords & IDs · Security
Online GUID/UUID generator with many formatting options.
Passwords & IDs · Security
Check if your email or password has appeared in known data breaches.
Headers & CSP · Security
Mozilla's scanner that grades a site's security headers and config.
SSL & TLS · Security
Diagnose why Let's Encrypt certificate issuance fails for a domain.
SSL & TLS · Security
Generate recommended TLS configurations for many servers.
Reference & Standards · Security
Open Worldwide Application Security Project: standards like the Top 10.
Penetration Testing · Security
Free, in-depth web security training with interactive labs, maintained by the Burp Suite team.
Headers & CSP · Security
Scan any site's HTTP security response headers and get a grade.
SSL & TLS · Security
Deep SSL/TLS server certificate and configuration analysis.
Passwords & IDs · Security
Generate UUIDs/GUIDs in bulk, including v4 and v7 versions.
Reference & Standards · Security
Official W3C validator for HTML markup quality.