Online Toolbox

Encode text to Base64 or decode Base64 to text.

Count characters, bytes, words, and lines in real-time.

Convert colors between HEX, RGB, and HSL formats.

Visually generate cron expressions with human-readable descriptions and next execution times.

Convert CSV data to JSON and JSON data to CSV.

Generate SHA-1, SHA-256, SHA-512 hash values from text.

Compress images directly in your browser. No server upload required — your files stay private.

Format and validate your JSON data with syntax highlighting.

Convert between binary, octal, decimal, and hexadecimal in real-time. Includes bit visualization and programming notation.

Generate secure random passwords instantly. Customize length, uppercase, lowercase, numbers, and special characters.

Convert text or URLs into QR codes.

Fair random picking, shuffling, and team dividing in one place. Uses cryptographic randomness (crypto API) to guarantee unbiased results.

Convert text between uppercase, lowercase, camelCase, snake_case, kebab-case and more in real-time.

Convert Unix timestamps to dates and dates to timestamps.

Encode text to URL format or decode URL-encoded strings.

Generate UUID v4 instantly. Supports bulk generation and dash removal.

Calculate your international age and Korean age from your birthdate.

Calculate your Body Mass Index (BMI) from height and weight.

Calculate your body fat percentage using height, neck, and waist measurements. Based on the US Navy formula.

Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Based on Mifflin-St Jeor equation.

Calculate compound interest with principal, monthly deposits, and interest rate. View yearly asset growth.

Calculate the number of days until a specific date, or find the date N days from a given date.

Enter monthly electricity usage (kWh) to calculate your bill with progressive tier pricing. See detailed breakdown of base charge, usage charge, taxes, and surcharges.

Calculate exchange rates between Korean Won and major currencies.

Enter your annual salary to calculate income tax, insurance, and estimated take-home pay.

Calculate monthly payments and total cost for installment purchases. Compare interest-free and interest-bearing plans.

Calculate monthly payments and total interest from loan amount, rate, and term.

Calculate monthly mortgage payments and LTV ratio from property value, down payment, and interest rate.

Calculate percentages easily. X% of Y, what % is X of Y, percentage change.

Calculate your savings maturity amount with monthly deposit, interest rate, and period. Compare simple vs compound interest and tax options.

Calculate severance pay based on employment dates and salary. Based on Korean Labor Standards Act.

Convert between length, weight, and temperature units.

Browse emojis by category — smileys, animals, food, travel, and more — or type a keyword in the search box to find what you need instantly. Click any emoji to copy it to your clipboard, then paste it directly into social media posts, chat messages, or documents.

Find HTML entities for reserved characters like &, <, and >, as well as copyright symbols, arrows, and mathematical operators — each shown with both its named and numeric code. Search by character or description to locate the entity you need, then click to copy the code to your clipboard for immediate use in HTML or CSS.

View the full list of HTTP status codes colour-coded by class: 2xx success, 3xx redirects, 4xx client errors, and 5xx server errors. Search by code number or keyword to quickly look up the meaning, common causes, and typical fixes — essential when developing or debugging APIs and web services.

Switch between Windows and Mac tabs to view platform-specific shortcuts, all organised by category — file management, browser navigation, text editing, screenshot tools, and more. Use it as a quick reference to discover shortcuts you haven't tried yet and speed up your everyday workflow.

A comprehensive reference of common Korean spelling mistakes organized by category. Compare incorrect and correct forms with easy tips and example sentences.

See the core regex syntax — character classes, quantifiers, anchors, groups, and more — presented as a pattern, description, and example trio for quick reading. Use the search box to filter by keyword while coding, so you can look up the exact syntax you need without leaving your workflow.

Browse frequently used special symbols organized by category — arrows, math, currency, shapes, stars, music notes, and more. Click any symbol to copy it to your clipboard.