UtilityBox Tool Directory

Count characters with and without spaces, words, lines, and byte length. Useful for job applications, blog drafts, ad copy, and assignment length checks.

Convert English text to uppercase or lowercase, and change strings into developer-friendly formats like camelCase, snake_case, PascalCase, and kebab-case.

Calculate percentages, increase or decrease rates, and the value that corresponds to a specific percentage.

Enter the original price and discount rate to calculate the saved amount and final payment price.

Enter starting principal, monthly contribution, expected return, and period to calculate compound growth and final balance.

Calculate total invested amount, total holdings, average cost, and profit or loss for stocks or crypto bought across multiple prices.

Enter buy price, sell price, quantity, and fees to calculate net profit, ROI, and breakeven sell price.

Calculate total selling fees, effective rate, and estimated payout.

Split group expenses fairly by reflecting total amount, participants, alcohol sharing, late joiners, and excluded guests.

Input a list of numbers to instantly compute arithmetic mean, total sum, data count, median, mode, min/max values, variance, and standard deviation. Easily calculate weighted averages and analyze your dataset with precision.

Calculate score rank, class rank, top percentage, percentile, and tie counts from a score list or total people.

Calculate monthly, yearly, and long-term opportunity costs from small recurring expenses such as subscriptions, coffee, snacks, and delivery food.

Enter your target and current value to calculate progress rate, remaining amount, and whether the goal has been exceeded.

Compare three win-rate formulas from wins, losses, and draws, calculate the minimum winning streak needed for a target, and preview additional results.

Convert length, weight, and temperature units such as cm, inch, kg, lb, Celsius, Fahrenheit, and Kelvin.

Upload JPG, PNG, WebP, GIF, SVG, BMP, AVIF, HEIC/HEIF, or TIFF images, then adjust quality, width, height, and output format in your browser without server uploads.

Convert HEX, RGB/RGBA, HSL/HSLA, HSV, and CMYK color codes, adjust alpha transparency, copy CSS snippets, generate palettes, and check text contrast.

Measure elapsed time and save lap records in your browser. Useful for study sessions, workout intervals, work tracking, experiments, and cooking timers.

Run 25-minute focus sessions, 5-minute breaks, long breaks, auto-start sessions, and sound alerts for study, deep work, and productivity routines.

Calculate D-Day, D-100, days remaining, days elapsed, and date differences for exams, trips, birthdays, anniversaries, and project deadlines.

Count business days with weekends and South Korean holidays excluded.

Enter the date of death to calculate the 1st through 7th weekly memorial dates, the final 49-day memorial, weekdays, and remaining days.

Add and subtract hours, minutes, and seconds with accurate 60-minute time arithmetic. Calculate work hours, study time, video duration, travel time, and end time.

Calculate full age, year age, Korean counting age, elapsed days, elapsed months, and days until the next birthday from a date of birth.

Generate highly secure random passwords with custom lengths and options (uppercase, lowercase, numbers, symbols, excluding similar characters) to prevent hacking. Runs 100% locally.

Check password strength, character variety, repeated characters, predictable patterns, common words, and estimated cracking time.

Compare original and modified text to find added, removed, and changed parts by line or word.

Generate custom lottery combinations. Fully compatible with South Korea 6/45, USA Powerball, Mega Millions, and custom formats. Set forced/excluded filters and review combinations statistics.

Enter your custom choices and spin the wheel to decide randomly. A free web utility perfect for choosing dinner menus, picking game penalties, or dividing chores.

Randomly shuffle participant names and create fair groups by team count or number of people per team.

Set a minimum, maximum, draw count, duplicate option, exclusions, and odd or even filter to generate random integers or decimals in your browser.

Draw a circle with your mouse or finger and score circularity, closure, smoothness, and rotation coverage. Includes fullscreen mode and an in-canvas result overlay.

Compare two MBTI types by relationship context and get a compatibility score, chemistry summary, axis breakdown, strengths, friction points, and practical tips.

Inspect photo and image EXIF metadata, GPS location, capture time, camera details, and XMP/IPTC data in your browser, then remove sensitive metadata before sharing.

Calculate BMI from height and weight to quickly check whether your result falls into underweight, normal, overweight, or obese ranges.

Enter total cholesterol, HDL, LDL, and triglycerides to calculate non-HDL cholesterol, estimated LDL, lipid ratios, and general reference ranges.

Calculate your Zone 2 heart rate range using age, resting heart rate, and maximum heart rate for running, cycling, walking, and aerobic base training.

Calculate running pace, finish time, distance, speed, and split times from any two values. Plan 5K, 10K, half marathon, marathon, and negative split race pacing.

Calculate basal metabolic rate for men and women, then learn about the BMR formula, average BMR, resting calories, and metric or imperial inputs.

Estimate total daily energy expenditure, maintenance calories, and fixed calorie deficit or surplus scenarios with metric or imperial inputs.

Calculate caffeine from drinks using adult references or a weight-based guide for children and teenagers.

Estimate your personalized daily water intake goal based on weight, activity, and climate, and track your hydration logs interactively.

Estimate BAC and pure alcohol from weight, drinks, and elapsed time.

Calculate your daily protein intake range from body weight, activity level, and fitness goal. Useful for weight loss, muscle gain, running, and general health.

Calculate maintenance calories, daily calorie deficit, target calorie intake, and estimated weight-loss timeline from weight, height, age, activity, and goal.

Enter sex, age, height, weight, neck, waist, and hip measurements to estimate body fat percentage, fat mass, lean mass, BMI, and target weight.

Calculate what time to sleep or wake up using 90-minute sleep cycles, sleep-now timing, and adjustable time to fall asleep.

Calculate apparent temperature from air temperature, humidity, and wind speed using heat index or wind chill formulas.

Calculate the discomfort index, comfort category, and dew point from air temperature and relative humidity in Celsius or Fahrenheit.

Format JSON data for easier reading and validate syntax errors in API responses or configuration files.

Encode text and image files to Base64 or decode Base64 strings. All processing runs directly in your browser.

Convert text to Morse code or decode Morse code back to text, with audio playback and light signal support.

Check how the browser detects each key press. Useful for testing keyboard input issues, shortcut behavior, and modifier keys.

Create UTM tracking links for GA4 and ad campaigns by combining source, medium, campaign, term, and content values.

Create a QR code from a URL or text and download it as a PNG image for flyers, business cards, menus, or campaign links.

Enter weight and reps to estimate your one-rep max, then check training weights by intensity percentage.

Split daily calories into carbohydrate, protein, and fat by percentage, protein grams per kilogram, or direct macro grams with per-meal targets.

Calculate aspect ratios from width and height dimensions, lock aspect ratios when resizing resolutions, and estimate contain/cover padding or crop values.

Test your reaction time in milliseconds using clicks or the spacebar key. Supports single tests, 5-round averages, 10-round challenges, and stats tracking.

Extract dominant color palettes locally in your browser without uploading to a server. Pick specific pixel codes and convert between HEX, RGB, HSL, HSV, and CMYK formats.

Measure WPM, CPM, accuracy, and typing errors in real time with English, Korean, and mixed prompts. Includes timed, completion, free typing, and recent records.

Enter your dog or cat's birth date to find their age in human years, life stage, and days until the next birthday. Dog calculation supports small, medium, and large size.

Generate fasting schedules (16:8, 18:6, 20:4, 24h, or custom). Plan fasting end times and eating windows for your meal routine.

Enter a birth date to plot the traditional 23-day physical, 28-day emotional, and 33-day intellectual biorhythm sine waves with a 31-day chart. For recreation only.

Enter departure and arrival time zones to calculate the time difference, direction, and estimated recovery days, then get a personalized adaptation schedule from pre-travel sleep shifts to post-arrival light exposure tips.

Calculate monthly and annual car maintenance costs, including loan payments, insurance, taxes, fuel, parking, tolls, and routine upkeep. Analyze fixed versus variable vehicle expenses.

Estimate your dog or cat's obesity level, ideal weight range, and daily calorie needs using current weight and the 9-point Body Condition Score (BCS).

Calculate fuel costs for a specific trip, commute, or month by entering distance, fuel efficiency, and price. Supports splitting fuel costs per passenger.

Calculate actual fuel economy (km/L, MPG, L/100km) from driven distance and fuel added. Compare with reference or EPA ratings to track efficiency.

Estimate electric car monthly maintenance costs, EV charging costs, insurance, tax, parking, service budgets, and cost per mile.

Estimate monthly car loan payments, total interest, amount financed, cash due at signing, and balloon payment impact from purchase price, down payment, trade-in value, cash incentive, APR, and term.

Estimate current used car value, future resale value, retained value, total depreciation, and monthly depreciation cost from purchase price, age, mileage, condition, and ownership period.

Calculate pay raise percentage, new annual salary, annual difference, and monthly salary change from current salary, raise rate, target salary, or raise amount.

Estimate monthly take-home pay in KRW from gross annual salary using South Korea payroll assumptions, employee deductions, income tax, and local income tax.

Estimate Korean pre-tax severance from dates, wages, and eligibility.

Convert Korean hourly, monthly, and annual pay by weekly hours.

Estimate Korean pre-tax unused annual leave pay from ordinary wage and unused leave days.

Estimate South Korea annual leave days from hire date, calculation date, and grant basis.

Calculate work days with schedules, holidays, leave, absences, and extra work.

Estimate South Korea weekly holiday pay from hourly wage, scheduled weekly hours, and completion status.

Estimate South Korea gross additional pay by classifying overtime, night work, holiday tiers, and overlapping premium segments from hourly wage, clock-in/out time, and breaks.

Estimate South Korea weekday overtime pay from hourly wage, clock-in/out time, and breaks by classifying hours beyond the daily 8-hour standard.

Estimate South Korea night work pay by classifying paid hours between 10 p.m. and 6 a.m. from hourly wage, clock-in/out time, and breaks.

Estimate South Korea holiday work pay by classifying holiday work within 8 hours and over 8 hours from hourly wage, clock-in/out time, and breaks.

Convert a Gregorian date, identify regular or leap lunar months, and compare East Asian lunar month date ranges.

Convert Gregorian dates to lunar dates and lunar dates back to Gregorian dates with leap-month and regional reference support.

Estimate a Korean military discharge date, remaining days, elapsed days, and service progress from enlistment date and service type.

Calculate estimated military savings maturity amount from monthly contribution, term, bank rate, and matching support.

Check Korean Marine Corps cohort dates using confirmed historical entries and the last-Monday rule from cohort 1157 onward.

Calculate ROK Air Force technical enlisted application points from license, major, and bonus items based on the MMA scoring table.