WebRTC-based P2P file transfer between browsers, with no relay server and all file data kept local to your devices.
Check a site’s HTTP and HTTPS reachability, status codes and redirects via a public proxy to quickly spot HTTPS configuration issues and redirect problems.
Generate MAC addresses locally with batch output, formatting options, optional prefix, and LAA/multicast bit controls. One-click copy.
Calculate DTLS certificate fingerprints from PEM and generate an SDP a=fingerprint line. Supports multiple hash algorithms. Local-only.
Parse and visualize WebRTC ICE candidates from SDP with filters and one-click copy. Useful for connectivity troubleshooting.
Send HTTP requests with custom methods, headers and body, with all requests running locally in your browser.
Parse raw HTTP headers into JSON or generate raw headers from JSON, with simple Cookie splitting, all locally in your browser.
Generate and parse Content-Security-Policy headers with common directives, security warnings and normalized output. All processing runs locally in your browser.
Parse and generate cron expressions with common templates, visual field editing and upcoming run previews. All calculations are performed locally in your browser.
Visually build cron expressions with presets, validation and next-run preview. All calculations are performed locally in your browser.
Validate Apple App Site Association (AASA): check reachability, Content-Type, JSON structure and applinks rules; includes a Universal Links matcher and a troubleshooting guide.
Visual helper to analyze CORS preflight and response header configuration.