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Solar Lunar Converter
Date & Time ToolsConvert dates between solar (Gregorian) and lunar calendars with Can Chi, zodiac, solar terms, and holiday details.
Stopwatch
Date & Time ToolsPrecise stopwatch and countdown timer with lap recording. Track time for workouts, cooking, studying, or any activity.
Significant Figures Calculator
Math ToolsCount significant figures in any number, round to specified sig figs, and perform arithmetic with proper significant fig...
CSV to JSON Converter
Data Format ToolsConvert CSV data to JSON format instantly. Supports custom delimiters, auto-detection, and flexible output options.
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Test your laptop touchpad functionality - detect taps, gestures, multi-touch, and pointer tracking i...
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files. Compare hashes to veri...
Calculate subnet mask, network address, broadcast address, host range, and CIDR notation for IPv4 an...
Convert GPS coordinates between Decimal Degrees, DMS, DDM and UTM formats. Interactive map preview w...
Generate strong random passwords and memorable passphrases with customizable length, characters, and...
Simulate hacking on screen with realistic code output. Type any key to display code from multiple pr...
Generate creative usernames for social media, gaming, and online accounts with multiple styles and m...
Decode and inspect JSON Web Tokens instantly. View header, payload, signature with claims explanatio...
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Calculate running pace, finish time, or distance. Enter any two values and get the third automatical...
Generate realistic fake Blue Screen of Death screens to prank your friends. Supports Windows 11/10,...
Simulate a cracked screen to prank your friends. Tap anywhere to create realistic glass crack effect...
Simulate a fake file download that never finishes. Choose preset filenames, adjust speed, and watch...
Estimate your one rep max (1RM) from the weight and reps you can lift, using 7 proven strength formu...
Estimate your VO2 max aerobic fitness level using Cooper test, beep test, race results, or heart rat...
Estimate calories burned for 100+ exercises and activities using scientifically-backed MET values fr...
Plan your race pacing strategy with even, negative, or positive splits for any distance from 5K to u...
Interval timer for HIIT, Tabata, EMOM and custom workouts. Set work/rest periods, rounds, sets, and...
Calculate your Wilks-2 and DOTS scores to compare powerlifting performance across different body wei...
Create custom word search puzzles with your own words. Choose grid size, difficulty level, and play...
Track scores for board games, card games, and sports. Add players, manage rounds, view history, and...