All Tools

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.

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

Enter a list of numbers to calculate average, sum, median, minimum, maximum, and standard deviation at once.

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.

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.

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.

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.

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.

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.

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.