Developer Calculators

Developer Calculators group networking, encoding and password tools that share one audience: people who work with addresses, bit patterns and secrets that must not leave the browser. Each page shows the working, not only the answer.

• Password Generator The Password Generator produces random passwords from the character sets you choose and reports strength in bits of entropy. Every password is generated in your browser; nothing is transmitted, logged or stored.
• IP Subnet Calculator The IP Subnet Calculator takes an IPv4 or IPv6 address with a prefix length and returns the network address, broadcast address, usable host range, subnet mask, wildcard mask and host count.
• Binary Calculator The Binary Calculator adds, subtracts, multiplies and divides base-2 numbers, converts to decimal, and applies bitwise operations with an optional fixed bit width.
• Hex Calculator The Hex Calculator performs hexadecimal arithmetic and bitwise operations, and converts between hex, decimal, binary and octal for debugging memory and colour values.
• Base64 Encode and Decode The Base64 Encode and Decode tool converts text or file bytes to Base64 and back, entirely in the browser, with padding, URL-safe alphabet and size reporting.
• URL Encode and Decode The URL Encode and Decode tool percent-encodes strings with encodeURI, encodeURIComponent and form encoding modes, and decodes percent sequences back to text.
• Big Number Calculator The Big Number Calculator performs exact integer arithmetic, factorials, GCD, LCM and prime factorisation beyond the limits of ordinary floating-point calculators.