OneTapKit OneTapKit

Free tools that work the moment you open them - no sign-up, no install

Online TimerCountdown timer with alarm: 1, 3, 5, 10 minutes Pomodoro Timer25 minutes focus + 5 minutes break Online StopwatchStopwatch with lap times Korean Age CalculatorInternational age, Korean age, zodiac, days lived D-Day Countdown CalculatorDays until a date; 100-day and yearly anniversaries Character CounterCharacters with/without spaces, words, bytes Pyeong to m² ConverterPyeong, m² and sq ft, with apartment size chart VAT and Sales Tax CalculatorAdd or remove VAT, GST or sales tax for your country Loan Interest CalculatorMonthly payment and total interest, three repayment types Lotto Number GeneratorRandom 6/45 lotto numbers Korea Severance Pay CalculatorEstimate Korean severance pay from dates and wages Image CompressorShrink photo file size, nothing uploaded Unit ConverterLength, weight, area, temperature, data units BMI CalculatorBMI, category and healthy weight range Date CalculatorAdd days to a date; days between two dates Savings and Deposit Interest CalculatorMaturity amount and after-tax interest Password GeneratorStrong random passwords, with strength meter Percentage CalculatorPercent of, percent change, discount price Random Name PickerPick winners, shuffle order, make teams Korean Keyboard ConverterEnglish keys to Hangul and back (dkssud = 안녕) Ladder Game (Ghost Leg)Ghost Leg / Amidakuji: names and outcomes Korea Hourly Wage CalculatorHourly to monthly pay, weekly holiday allowance Text ToolsCase, spaces, duplicate lines, sorting Number Base ConverterBinary, octal, decimal, hex and bases 2-36

What is OneTapKit?

OneTapKit is a collection of small, free tools you can use right away: no account, no download. Everything you type stays in your browser and is never sent to a server. New tools are added regularly. Several tools are made for life in Korea (Korean age, pyeong, Korean VAT, severance pay and more), with explanations in English.