Loading tool...
Visual Content Security Policy builder. Create CSP headers to protect against XSS and code injection attacks
Generate Subresource Integrity (SRI) hashes for scripts and stylesheets. Protect against CDN compromise and tampering
Calculate IPv4 and IPv6 subnet details including network address, broadcast, host range, netmask, and wildcard mask
A quick reference for every HTTP status code. Look up any code from 100 to 599, see what it means, when servers return it, and how to handle it in your application.
401 means the request lacks valid authentication credentials. 403 means the server understood who you are but you're not allowed to access the resource.
Use 404 when a resource is not found but might exist later. 410 signals the resource existed once but has been permanently removed.
All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.