Enforce least-privilege browser hardware controls: disable camera, microphone, GPS, and WebUSB.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Toggle permissions for camera, microphone, geolocation, and payment APIs.
Choose Block (), Self (self), or All (*).
Copy the HTTP header string or Next.js/Nginx snippets.
Permissions-Policy is the modern W3C standard replacing Feature-Policy to control browser API access in documents and iframes.
Set microphone=(self) or microphone=() in your response header.
Zero-egress companion tools in the Security & Network suite
Measure cryptographic randomness, Shannon entropy (0-8 bits/byte), Chi-square test, and byte distributions.
Brute-force all 256 single-byte XOR keys with automated English frequency & chi-squared scoring.
Audit CSP, HSTS, X-Frame-Options, and security headers with OWASP grading (A+ to F).
Compare memory hardness, GPU ASIC resistance, and security parameters across KDF standards.
