All web tools
Practical tools that run right in your browser — no install needed. Each tool page includes how-to guides, calculation basis, and FAQs so it's genuinely useful, not just a button.
Character Counter
Instantly check the character and word count of essays, blog posts, and assignments.
UTF-8/SMSByte Calculator
See how many bytes your text takes and stay within submission limits.
ContentReading Time Calculator
Estimate how long a blog post, speech script, or announcement takes to read.
MarketingUTM Link Builder
Build UTM links to separate traffic sources for blog, social, and email campaigns.
Print/PDFReceipt A4 Organizer
Turn scattered receipt images into a single sheet ready to submit.
Job/ResumeResume Character Counter
Match each resume field's character limit with a real-time count of characters (with/without spaces) and how many remain.
UTF-8/EUC-KRKorean Byte Calculator
Compare how many bytes Korean text takes in UTF-8 versus EUC-KR at a glance.
Tax/BillingVAT Calculator
Split 10% value-added tax out of a supply amount or a gross total automatically.
Property/TaxCapital Gains Tax Calculator
Subtract expenses, the long-term holding deduction, and the basic deduction from a property gain, then apply progressive rates.
Payroll/InsuranceTake-home Salary Calculator
See your real monthly take-home pay after the four insurances and income tax are deducted from your salary.
Finance/RepayLoan Repayment Calculator
Calculate monthly payment and total interest by loan amount, rate, and term in two repayment modes.
HR/PayrollSeverance Pay Calculator
Estimate severance pay from your start/end dates and last 3 months of wages, based on average wage.
Text/EnglishCase Converter
Convert text to uppercase, lowercase, title, camelCase, snake_case, and more, instantly.
Security/ToolPassword Generator
Create strong random passwords right in your browser with adjustable length and character sets.
PDF/ConvertImage to PDF
Combine several JPG or PNG images into one PDF in your browser. No upload, no install.
Developer/TextJSON Formatter
Format, validate, and minify JSON instantly in your browser.
Everyday/DateAge Calculator
Enter a date of birth to get exact age and the days until the next birthday.
Welfare/PensionBasic Pension Eligibility Checker
Enter income and assets to estimate eligibility for Korea's Basic Pension against the 2026 threshold.
Tax/AssetsInheritance & Gift Tax Calculator
Estimate inheritance or gift tax by subtracting deductions and applying progressive rates.
Payroll/InsuranceHealth Insurance Calculator
Enter your monthly salary to calculate the 2026 employee health and long-term care premiums.
Health/EverydayBMI Calculator
Calculate your BMI (body mass index), its category, and the healthy weight range for your height. A simple starting point for weight awareness.
Shopping/EverydayDiscount Calculator
Work out the final price and your savings from an original price and discount. Stack a second discount to see the real effective rate.
Everyday/DiningTip Calculator
Split a bill fairly: enter the amount, tip percent, and party size to see the tip, total, and per-person share.
Math/EverydayPercentage Calculator
Find a percent of a number, a ratio, and a percentage change in one place — the three percentage calculations you use most, from discounts to tax to scores.
Finance/MathInterest Calculator
Calculate simple and compound interest, plus the total maturity value, from a principal, rate, and time. Useful for gauging savings or loan interest.
Date/EverydayDate Difference Calculator
See how many days, weeks, months, and years lie between two dates. Useful for countdowns, job tenure, and anniversaries.
Regional/HealthRegional Health Insurance Calculator
Estimate the 2026 regional (self-employed/retiree) health insurance premium from annual income and property.