🛠️ Free Online Tools
Calculators, converters & guides — no signup required
67 tools • 6 languages • 100% free
🧳 Travel
Tax Free Calculator
Calculate your tax refund for Japan, Europe, Thailand and more.
IC Card Guide
Compare Suica, ICOCA, Pasmo and other Asian transit cards.
Voltage & Plug Guide
Check voltage, frequency and plug types by country.
Tip Calculator
Calculate tips and split bills for dining and travel.
Japan Address Guide
Understand Japanese address structure, prefectures, and postal codes.
Korea Train Guide
Compare KTX, SRT fares, travel times and station info.
🧮 Finance & Life
Annual Leave Calculator
Calculate Korean annual leave days by service years.
Weekly Holiday Pay Calculator
Calculate Korean weekly holiday pay for part-time and full-time workers.
Salary Converter
Convert between annual, monthly, weekly, daily, and hourly pay.
Loan Calculator
Calculate loan payments with amortization schedule.
Compound Interest Calculator
Calculate compound interest with monthly contributions.
Currency Converter
Convert between 20+ currencies with approximate rates.
Rent vs Buy Calculator
Compare renting vs buying a home over time.
Invoice Generator
Create and print professional invoices for free.
💻 Developer
Password Generator
Generate strong random passwords with strength meter.
Color Blindness Simulator
Simulate color blindness types with WCAG contrast check.
Crontab Generator
Generate and validate cron expressions with ease.
SVG to ICO Converter
Convert SVG files to multi-size ICO favicons.
OG Tag Preview
Preview Open Graph tags for social media sharing.
JSON Formatter & Validator
Format, minify, and validate JSON with tree view.
Base64 Encoder/Decoder
Encode and decode Base64 text and images.
URL Encoder/Decoder
Encode, decode URLs and parse query strings.
JWT Decoder
Decode JWT tokens, check expiration, and view claims.
Regex Tester
Test regular expressions with real-time highlighting.
Diff Checker
Compare two texts side-by-side with character-level diff.
UUID Generator
Generate UUID v4, v7, ULID with bulk and validation.
Hash Generator
Generate MD5, SHA-256, SHA-512 hashes with HMAC support.
Color Converter
Convert colors between HEX, RGB, HSL, CMYK with WCAG contrast check.
Timestamp Converter
Convert Unix timestamps to dates with timezone support.
🇰🇷 Korea
Korea Map Code
Get map coordinates for Korean addresses.
Korean Holidays
Korean public holidays and bridge day planner.
Korean Name Romanizer
Convert Korean names to English with passport-style romanization.
Korean Age Calculator
Calculate Korean age, international age, and zodiac animal.
Korean Address Converter
Convert Korean addresses to English for international shipping.
Korea Visa Checker
Check visa requirements for South Korea by nationality.
🌍 Global
Shoe Size Converter
Convert shoe sizes between US, EU, UK, JP, KR systems.
Ring Size Converter
Convert ring sizes between US, EU, UK, JP, KR systems.
Percentage Calculator
Calculate percentages, increases, decreases, and ratios.
BMI Calculator
Calculate BMI with WHO and Asia-Pacific standards.
TDEE Calculator
Calculate daily calorie needs with BMR and activity level.
Age Calculator
Calculate exact age, zodiac, generation, and birthday countdown.
Timezone Converter
Convert times between world timezones.
Wi-Fi QR Generator
Generate QR codes for Wi-Fi network sharing.
Paper Size Comparison
Compare paper sizes: A4, Letter, Legal and more.
Clothing Size Converter
Convert clothing sizes between international systems.