Free Tools
Handle images, text, numbers and data formats without digging through random sites.
Images and social assets
Compress images, check social sizes and convert colors.
Quotes, tax and business numbers
Invoice tax, loans, Chinese amount and business calculators.
Data format and debugging
JSON, Base64, URL encoding, timestamps and hashes.
Everyday calculations
BMI, percentages, units, age, countdowns and overtime.
BMI Calculator
Enter your height and weight to get your BMI and weight category instantly.
Overtime Pay Calculator (Taiwan)
Enter salary and overtime hours to break down weekday and rest-day OT pay under Taiwan labor law.
Unit Converter
Convert length, weight and temperature instantly — common units in one place.
Age Calculator
Enter your birth date to get your exact age, total days lived and days to your next birthday.
Percentage Calculator
Three modes: percent of a value, what-percent ratio, and percent change.
Random Number / Picker
Generate a random number in a range, or randomly pick one name from a list.
Countdown Timer
Set a target date and count down the days, hours, minutes and seconds live.
NHI Supplementary Premium Calculator (Taiwan)
Pick bonus, dividend, rent, part-time wage and more to estimate the 2.11% premium.