Handy Tools
Free online tools โ Percent Calculator, Unit Converter, Roulette, and 64 more useful tools
Life & Daily Tools
Four Pillars Calculator
Analyze your Four Pillars of Destiny (Saju) based on birth date and time.
Postal Code & Address Search
Search Korean postal codes and convert to English addresses.
BMI Calculator
Calculate your Body Mass Index and check your health category.
Salary Calculator
Calculate Korean take-home pay with tax and insurance deductions.
Age Calculator
Calculate international age, Korean age, zodiac, and D-day.
Random Picker
Random number generator, list picker, coin flip, and dice roll.
Korean โ English Typing Converter
Fix text typed with the wrong keyboard layout.
Roulette Wheel
Spin the wheel to pick a random winner from your list.
Retirement Pay Calculator
Calculate retirement pay based on Korean Labor Standards Act.
GPA Calculator
Calculate your GPA by entering subjects, credits, and grades.
Electricity Bill Calculator
Calculate monthly electricity bill based on KEPCO rates.
Timer / Stopwatch
Online timer and stopwatch with alarm and lap recording.
Chinese Zodiac Calculator
Find your Chinese zodiac animal and 60-year cycle from birth year.
Calorie Calculator
Calculate your daily calorie needs (TDEE) and BMR.
Color Palette Generator
Generate beautiful random color palettes and copy color codes.
Excel & Office Tools
Excel Formula Helper
Upload an Excel file and get smart formula recommendations based on your data.
Excel Function Dictionary
Search and browse 50 essential Excel functions with syntax and examples.
MS Office Activation Helper
Activate Windows and Office with a single PowerShell command โ no crack or third-party tools needed.
Box Shadow Generator
Create CSS box-shadow effects with a visual editor and multiple layers.
CSS Gradient Generator
Create beautiful CSS gradients with a visual editor and presets.
TOTP Generator
Generate time-based one-time passwords (2FA codes) with live countdown.
Percent Calculator
Calculate percentages, discounts, and percent changes instantly.
Date Calculator
Calculate D-day, date differences, and add/subtract days.
Unit Converter
Convert between units of length, weight, temperature, area, volume, speed, and data.
Korean Amount Converter
Convert numbers to Korean text for invoices and contracts.
Loan Calculator
Calculate loan repayments with amortization schedule.
Time Calculator
Calculate time differences, add/subtract time, and work hours.
Excel Shortcuts
Searchable reference of essential Excel keyboard shortcuts.
Text & Office Tools
Word Counter
Count characters, words, lines, and bytes in real-time.
CSV Viewer
Paste CSV data and view it as a formatted table.
JSON โ CSV Converter
Convert between JSON arrays and CSV data.
Text Case Converter
Convert text to UPPER, lower, camelCase, snake_case, and more.
Table Generator
Visually create tables and export as Markdown, HTML, or CSV.
Find & Replace
Find and replace text patterns with regex support.
Text Line Sorter
Sort, deduplicate, reverse, number, and process text lines.
Password Generator
Generate secure random passwords.
Byte Converter
Convert between B, KB, MB, GB, TB, and PB in real-time.
Excel Column Converter
Convert between Excel column names (A, AA...) and numbers (1, 27...).
QR Code Generator
Generate QR codes from text, URLs, or any string instantly.
Image to Base64
Convert images to Base64 data URI strings for embedding in HTML/CSS.
Emoji Picker
Browse, search, and copy emojis organized by category.
Placeholder Image Generator
Generate placeholder images with custom size, color, and text.
Aspect Ratio Calculator
Calculate and convert aspect ratios for images and videos.
Developer Tools
JSON Formatter
Format and validate JSON data with syntax highlighting.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text.
URL Encoder/Decoder
Encode or decode URL strings with percent-encoding.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Regex Tester
Test regular expressions and see matches in real-time.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes from text.
Color Converter
Convert between HEX, RGB, and HSL color codes in real-time.
Lorem Ipsum Generator
Generate dummy text for design and layout testing.
Diff Checker
Compare two texts and highlight differences line by line.
Markdown Preview
Preview Markdown text rendered as HTML in real-time.
JWT Decoder
Decode JWT token headers and payloads to inspect their contents.
CSS Minifier/Beautifier
Minify or beautify CSS code for optimization or readability.
HTML Escape/Unescape
Convert HTML special characters to entities or restore them.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal in real-time.
UUID Generator
Generate cryptographically secure UUID v4 identifiers.
JSON to TypeScript
Convert JSON objects to TypeScript interfaces automatically.
SQL Formatter
Format and beautify SQL queries with keyword uppercasing and indentation.
YAML โ JSON Converter
Convert between YAML and JSON formats bidirectionally.
Cron Expression Parser
Parse cron expressions, see field breakdowns, and preview next run times.
JS Minifier/Beautifier
Minify or beautify JavaScript code for optimization or readability.
XML Formatter
Format, minify, and validate XML documents with proper indentation.
HTTP Status Codes
Browse and search all HTTP status codes with descriptions.
HTML to JSX
Convert HTML markup to JSX with attribute and style transformations.
User Agent Parser
Parse and analyze browser User-Agent strings to detect browser, OS, and device.
Chmod Calculator
Calculate Unix file permissions with an interactive checkbox grid.
Flexbox Playground
Visual CSS Flexbox layout tester with live preview.
Border Radius Generator
Generate CSS border-radius values with a visual preview.
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph, and Twitter Cards.
URL Slug Generator
Convert text into URL-friendly slugs.
JSONPath Finder
Query JSON data using JSONPath expressions.
Code to Image
Convert code snippets into beautiful images.
CSV to SQL Converter
Convert CSV data into SQL INSERT statements.
SQL Cheatsheet + Query Generator
SQL syntax reference by DBMS and CRUD query generator.