Converters

Convert between units, temperature, speed, number bases and colour formats, and transform data between CSV, XML and TXT — all in your browser.

Convert a decimal number into a simplified fraction.

Convert a colour between HEX, RGB and HSL with a live swatch.

Check text/background contrast against WCAG AA and AAA.

Convert between B, KB, MB, GB, TB in binary or decimal.

Convert CSV rows into structured XML.

Flatten repeated XML records into CSV rows.

Turn space/tab/pipe-separated text into proper CSV.

Convert between Celsius, Fahrenheit and Kelvin.

Convert km/h, mph, m/s, knots and ft/s.

Convert numbers to Roman numerals and back.

Convert between binary, octal, decimal and hex.

Work out the aspect ratio from width and height.