Convert numbers between bases with a live bit view.
Convert colours three ways with a live preview.
Strong random passwords from crypto.getRandomValues.
Live Markdown preview rendered in the browser.
Pick a shape or drag the points, then copy the exact clip-path polygon CSS.
Draw random whole numbers in any range, with unique and sorted modes and a cryptographic source.
Convert 1-3999 both ways, see how each numeral adds up and catch non-standard forms like IIII.
Test any number for primality with Miller-Rabin, then get its prime factorisation and every divisor.
