All tools

Convert numbers between binary, octal, decimal and hexadecimal.

Convert between currencies using daily exchange rates.

Count the days, weeks, hours and the years, months and days between two dates, or add and subtract days, weeks, months or years from any date.

Calculate X percent of a number, find what percent one value is of another, and measure the percent change between any two numbers instantly.

Convert times between time zones and see a world clock.

Convert length, mass, temperature, area, volume and speed units.

Turn a code snippet into a polished, syntax-highlighted PNG card in your browser, with a theme, gradient or transparent background, and padding — no upload.

Check the WCAG contrast ratio between a foreground and background HEX color and see whether it passes AA and AAA for both normal and large text.

Turn one base HEX color into a Tailwind-style 50-950 shade scale, mixing toward white and black, each step with a swatch and copyable HEX.

Build a multi-layer CSS box-shadow with offset, blur, spread, color and inset controls, see a live preview, and copy the ready-to-use property.

Build a linear, radial or conic CSS gradient with custom color stops and an angle, preview the result live, and copy the ready-to-paste background rule.

Encode text to Base32 (RFC 4648) or Base58 (the Bitcoin alphabet) and decode either one back to text, fully UTF-8 safe and entirely in your browser.