All Tools

Estimate monthly payment and total interest from amount, rate, and term.

Calculate VAT included or excluded amounts.

Estimate Korean income tax and local income tax for salary, business, and freelance income.

Check a target site's server time and show a millisecond clock for ticketing and launches.

Count days until tickets, exams, trips, or any target date.

Calculate days, weeks, calendar difference, and weekdays between two dates.

Use a simple timer and stopwatch with lap records in your browser.

Compare Korea time with major cities and check the time difference.

Count characters, bytes, words, and lines instantly.

Estimate Korean take-home salary from monthly or annual pay.

Estimate Korean payroll deductions for pension, health, long-term care, and employment insurance.

Estimate seller profit, break-even price, and target-margin price from costs, shipping, fees, and ads.

Estimate Korean real estate brokerage fees.

Convert Korean monthly rent into a jeonse-style value.

Calculate discounts, percentage change, and part-to-whole ratios.

Mask phone numbers, emails, IDs, cards, accounts, IP addresses, and URL tokens in your browser.

Convert everyday area, length, weight, volume, and temperature units in seconds.

Paste items, remove duplicates, pick multiple winners, shuffle candidates, and copy results.

Format, minify, validate, sort keys, stringify, and convert JSON Lines.

Encode, decode, and inspect URL strings and query parameters.

Generate and copy UUID v4 values in your browser.

Encode plain text to Base64 or decode Base64 back to text.

Compare two texts line by line and spot additions, deletions, and changes.

Convert text into upper, lower, camel, snake, kebab, and title case.

Generate random passwords locally with length and character options.

Convert HEX colors to RGB and HSL and copy the values.

Check the format and checksum of a Korean business registration number.

Compress images in your browser without uploading them.

Resize photos by width, height, exact size, or percentage without uploading them.

Convert images to WebP, JPEG, or PNG locally and resize width when needed.

Preview HWPX documents in the browser and send them to a PDF save flow.

Estimate Korean severance pay from work period and average wage.

Estimate payout for unused annual leave days.

Load latest reference rates and convert KRW or foreign currency with fees.

Calculate international age from a birthday for forms and profiles.

Convert Korean millimeter shoe sizes with US, EU, and Japan sizes.

Calculate BMI from height and weight and check the range.

Run a simple Korean ladder game with names and outcomes.

Spin a wheel to pick lunch, penalties, winners, or quick decisions.

Calculate matching width or height while preserving image and video aspect ratio.