JSON Parser
Validate, format, and copy JSON in one editor.
Paste JSON and work with validation, formatting, minify, and copy on one screen.
Practical Tool Portal
A fast portal for calculators, converters, and everyday web tools
This portal brings together frequently used calculators and web tools in one place, focusing on screens you can use right away and concise guidance where it matters.
Korea-specific tools are hidden for the selected language.
Tool Portal
15 tools
Web Tools
Web Tools
Utilities for strings, encoding, and formatting tasks used on the web.
9 tools
URL Encode / Decode
Encode text for URLs or decode it back.
Useful for query strings, spaces, and non-ASCII characters.
Base64 Encode / Decode
Encode text as Base64 or decode it back.
Quickly convert text to and from Base64 in one screen.
JWT Decoder
Decode a JWT and inspect its header, payload, and time claims.
Paste a JWT string to read its header and payload as pretty JSON and inspect exp, iat, and nbf values.
Timestamp Converter
Convert Unix timestamps and date/time strings into readable values.
Switch between timestamp-to-date and date-to-timestamp conversion on one screen.
Regex Tester
Test a regular expression and inspect matches immediately.
Enter a pattern, flags, and sample text to see matches and captured groups.
Text Diff / Compare
Compare two texts line by line and inspect additions and removals.
Paste two texts side by side to quickly review line-level differences.
UUID Generator / Validator
Generate a UUID and validate its format, version, and variant.
Create a new UUID or validate an existing one instantly.
Hash Generator
Generate hashes from text using common algorithms.
Enter text and immediately get hash output for the selected algorithm.
Calculators
Calculators
Tools for quick calculations such as finance, percentages, dates, and health.
6 tools
Percentage Calculator
Quickly calculate percentage values from a base amount.
A simple calculator for discounts, markups, and percentage change.
Loan Payment Calculator
Estimate monthly payments with an amortized loan formula.
Enter principal, rate, and term to check monthly payment and total interest.
Savings Interest Calculator
Estimate maturity amount for monthly savings.
Enter monthly deposit, rate, and term to estimate maturity amount and interest.
BMI / BMR Calculator
Calculate BMI and basal metabolic rate together.
Enter height, weight, age, and sex to check BMI and BMR.
Date Difference Calculator
Calculate the number of days between two dates.
Useful for D-day tracking, contract periods, and schedule gaps.
Exchange Rate Calculator
Convert currencies using an applied exchange rate.
Use a live rate or enter one manually to convert between currencies.