Web Development Utilities
Encode/decode URLs, generate compliant QR codes with customizable logo templates, test API headers, and format HTML payloads.
Available Utilities
QR Code Generator
Generate custom QR Codes with custom colors, margins, error levels, and logo overlays.
CIDR / Subnet Calculator
Calculate network address, broadcast address, subnet mask, and host counts from an IPv4 CIDR block.
IP Address Converter
Convert an IPv4 address between dotted-decimal, binary, hexadecimal, octal, and 32-bit integer.
MAC Address Formatter
Normalize a MAC address into colon, hyphen, or Cisco dot notation, and generate random test MACs.
HTTP Status Code Reference
Searchable reference for standard HTTP response status codes and what they mean.
Port Number Lookup
Look up well-known and commonly used TCP/UDP port numbers and the services that use them.
Category In-Depth Guide & Best Practices
Expedite front-end iteration and integration testing with ToolSphere Web Utilities. Easily decode URL query parameters, escape HTML syntax characters, generate high-quality QR codes with logo overlays, and inspect request headers.
Every action runs synchronously in the browser UI, ensuring optimal responsiveness and private editing without telemetry track files.