57 tools
Generate QR codes from any text or URL
Calculate percentages, ratios & percentage change
Calculate exact age in years, months & days
Generate strong, random passwords instantly
Calculate sale prices, savings & discount percentages
Calculate tips and split bills between friends
Count down to any date or event
Precise stopwatch with lap timing
Generate random numbers within any range
Randomly pick items from your list
Calculate days between dates or add/subtract days
Generate barcodes from text or numbers
Boost focus with the Pomodoro technique timer
Write and save notes in your browser with auto-save
Test your typing speed and accuracy in WPM
Generate QR codes for WiFi network sharing
Convert between Roman numerals and decimal numbers
Calculate your Grade Point Average easily
Estimate your electricity bill from usage and rates
Calculate fuel costs for your trips
Compare unit prices to find the best deal
Convert times between different time zones
Draw and download your signature as an image
Record your screen directly in the browser
Advanced calculator with scientific functions
Validate Taiwan business IDs and national ID numbers
Convert between solar and lunar (Chinese) calendar dates
Find your zodiac sign, element & personality traits
Find your Chinese zodiac animal, element & traits
Blood type personality traits & compatibility guide
Look up Taiwan postal codes by city and district
Calculate Chinese name stroke count & fortune
Interactive multiplication table, click to copy
Translate Taiwan Chinese addresses to English
Check password strength and security level
Validate credit card numbers using Luhn algorithm
Count days until or since any date
Check current time in major cities worldwide
Find international dialing codes by country
Calculate Taiwan family relationship titles
Calculate sunrise, sunset, and twilight times using astronomical formulas
Create and render mathematical formulas with KaTeX
Lunar calendar with auspicious and inauspicious days
Random coin flip to help make quick decisions
Online dice roller tool, roll 1-6 dice
Multi-functional counter with multiple counters and targets
Clean digital clock with fullscreen support
Generate lucky numbers for lottery and passwords
Generate Taiwan mobile phone numbers with carrier prefixes
Fullscreen solid color test to detect dead pixels
Multi-player score tracker with auto ranking
Screen measurement tool with cm and inch support
Multiple alarms, repeat reminders, snooze function
Mathematical magic game that reads your mind
Ishihara color blind test for vision screening
Canvas animated wheel for random draws
Canvas drawing tool with pen/eraser/undo/redo