Browser-based web tools
Karu Tools
Karu Tools is a free collection of browser-based utilities for everyday tasks — counting characters, calculating ages, splitting bills, and more. No sign-up required.
Recommended tools
All tools Character Counter Edit text while counting characters, characters without whitespace, lines, paragraphs, and manuscript-page estimates directly in your browser, then copy the result. Japanese Era Converter Convert Gregorian dates from the Meiji era onward into Japanese era notation with era boundary dates handled correctly. Age Calculator Calculate age from a birth date and reference date, including the next birthday and days remaining. Split Bill Calculator Split a total amount by the number of people and round each share by 1, 10, or 100 yen.