Conversion Calculator
Convert between units of length, weight, volume, or temperature.
Open Calculator →Bandwidth Calculator
Solve for file transfer time, speed, or size — and see why bits and bytes give very different numbers.
Open Calculator →Base64 Encode / Decode
Encode or decode text as Base64, with correct handling of accented characters and emoji.
Open Calculator →IP Subnet Calculator
Calculate network address, broadcast address, subnet mask, and usable host range from an IP and CIDR.
Open Calculator →Password Generator
Generate a strong random password using the Web Crypto API's cryptographically secure random source.
Open Calculator →Roman Numeral Converter
Convert numbers to Roman numerals and back, 1 to 3999, using standard subtractive notation.
Open Calculator →URL Encode / Decode
Percent-encode or decode a URL query parameter, with a clear explanation of which function to use.
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