Simple tools,
instant results.

+65 utilities: converters, calculators, generators, hardware tests and more.

Length
Meters, feet, miles, inches…
Weight
Kg, pounds, ounces, tons
Temperature
Celsius, Fahrenheit, Kelvin
Volume
Liters, gallons, milliliters
Area
m², ft², acres, hectares
Speed
km/h, mph, m/s, knots
Time
Seconds, hours, days, years
Digital data
KB, MB, GB, TB, bits
Energy
Joules, calories, kWh
Pressure
Pa, bar, psi, atm
Angles
Degrees, radians, gradians
Currency
EUR, USD, GBP and more (live)
Number bases
Binary, octal, decimal, hex
Roman numerals
Decimal ⇄ Roman
Mortgage
Monthly payment and total interest
Loan
Calculate any personal loan payment
Compound interest
How much your investment will grow
BMI
Body Mass Index
Calories (BMR)
Daily calories you need
Tip
Split tips and bills
Percentages
%, discounts, increases
Exact age
Years, months, days lived
Days between dates
Difference between two dates
Discount
Final price after discount
Spanish income tax
Spain IRPF tax estimation
Passwords
Strong and random
UUID v4
Unique identifiers
QR codes
Generate QR from any text/URL
Lorem Ipsum
Placeholder text
Random number
Between two values
SHA hash
SHA-1, SHA-256, SHA-512
Color palette
Harmonious combinations
Word counter
Words, characters, lines
Change case
UPPER, lower, Title Case
URL slug
Convert text to slug
Reverse text
Flip any text around
Base64
Encode and decode Base64
URL encode
Encode and decode URLs
JSON formatter
Beautify and validate JSON
Color HEX/RGB/HSL
Convert between formats
Color picker
Visual picker and codes
What is my IP?
Public IP and location
Browser info
User agent, OS, screen
Speed test
Internet speed with rating
Monitor Hz
Measure real refresh rate
Mouse Hz
Mouse polling rate
Clicks per second
CPS test
Reaction time
Test your reflexes
DPI calculator
Convert sensitivity between DPIs
Stopwatch
With laps
Timer
Countdown with alarm
World clock
Time in multiple cities
Pomodoro
25 min work / 5 break
Resize image
Change size without quality loss
Convert image
PNG ⇄ JPG ⇄ WEBP
Image to Base64
Encode image for CSS/HTML
Compress image
Reduce the size of your JPG/PNG
Regex tester
Test regex with highlighting
Markdown to HTML
Live Markdown preview
Emoji finder
Find and copy emojis
CSS gradient generator
Design gradients and copy CSS
Box-shadow generator
Visual CSS shadow
WCAG contrast
Color accessibility check
Typing test
Measure your WPM
Screen test
Detect dead pixels
Microphone test
Check if your mic works
Virtual dice
Roll N-sided dice
Flip a coin
Toss a coin

Regex tester

Test regex with highlighting

Online regex tester

Test regex with highlighted matches in real time. Supports flags and groups. Use this regex tester directly in your browser, with instant results and no signup.

How to use it

Enter your values, choose the options you need and copy or download the result when it is ready. The tool is designed for quick everyday use from desktop or mobile.

Privacy and accuracy

Most calculations run locally in your browser. When a tool needs external data, such as exchange rates or IP information, the page explains it in context.

  • Free online tool
  • Works in your browser
  • Fast and easy to use
  • Text