Free Online Tools
You Actually Need
Simple, fast, and free — no signup, no installs. Just open and use.
Loan Calculator
Monthly payment and total interest
Age Calculator
Exact age in years, months, days from birth date
Compound Interest
Investment growth with monthly contributions
Discount Calculator
Sale price and discount percentage
Tip Calculator
Calculate tip and split the bill
Percentage Calculator
Percentages, change, increase/decrease
D-Day Calculator
Countdown to date, days between dates
Annual Leave Calculator
Leave days by years of service
Business Days Calculator
Add business days, count working days
Wage Calculator
Hourly to daily, weekly, monthly, annual
Watermark
Add text or logo watermark to photos
Favicon Generator
Create favicon.ico and PNG icons
All-in-One Image Tool
Resize + compress + convert in one
Image Resizer
Resize with aspect ratio lock
Image Compressor
Reduce file size with quality slider
Image Format Converter
JPG ↔ PNG ↔ WebP
HEIC to JPG
Convert iPhone/Galaxy HEIC photos
Metadata Viewer & Remover
View EXIF data, remove GPS & camera info
Metadata Editor (JPG)
Edit artist, copyright, date, camera info
Loudness Challenge
Who can make the loudest sound?
Reaction Time Test
Measure your reflexes in ms
Click Speed Test
Clicks per second (CPS)
Aim Test
Click accuracy trainer
Memory Test
Sequence memory game
Schulte Table
Number order focus game
Color Discrimination Test
Spot the different color
Number Memory
How many digits can you recall?
Sound Level Meter
Measure noise in decibels (dB)
Antipode Calculator
Find the opposite side of Earth
Dead Pixel Test
Find faulty screen pixels
Stopwatch
Lap timer to hundredths of a second
Random Number
Generate random numbers in a range
QR Code Generator
Logo, colors, PNG/SVG download
Online Alarm & Timer
6 sounds, countdown timer
Time Calculator
What time X min/hours from now? 36 presets
My IP Address & Device Info
IP, browser, OS, screen info
JSON Formatter
Beautify, minify, validate JSON
UUID Generator
Random v4 unique identifiers
Timestamp Converter
Unix epoch to date and back
Color Converter
HEX, RGB, HSL conversion
Crontab Generator
Build cron expressions with presets and live preview
Regex Tester
Test regex with real-time match highlighting
AI Token Counter
GPT, Claude, Gemini tokens & cost
Contrast Checker
WCAG AA/AAA color contrast
Site Photo Watermark
Stamp project info & GPS
Rebar Calculator
Weight & size chart
Wallpaper Calculator
Rolls needed
Flooring Calculator
Boxes & length
Board Feet Calculator
BF, m³, sai
Slope Calculator
Grade % & level
Concrete Calculator
Volume & ready-mix trucks
Paint Calculator
Liters & cans needed
Tile Calculator
Tiles & boxes needed
Brick Calculator
Masonry brick count
Pipe Sizing Calculator
Flow rate to pipe diameter with standard sizes
Area Calculator
Multi-zone area with material estimates
Volume Calculator
Volume with concrete & dump truck count
Material Calculator
Concrete mix, brick count, rebar weight
US Tide Times
NOAA high & low tide for US coasts
Tide Times
High & low tide for Korean coasts
Altitude
Your current elevation (GPS)
Sunlight Calculator
When sunlight enters your window
Sunrise & Sunset
Times, direction, golden hour, live sun position
Moonrise & Moonset
Times, direction, moon phase, live position
Bubble Level
Check level with phone sensor (mobile)
Compass
Find direction with phone sensor (mobile)