Step-by-step tutorials for every tool. Learn how to use calculators, converters and generators — with practical tips and real examples.
Converters
How to Convert Length Units Online
Conversion formulas for km to miles, meters to feet, cm to inches and more. Reference tables and instant online converter.
Dev Tools
How to Generate UUIDs Online
Learn what a UUID is, how UUID v4 works, and how to generate unique identifiers for databases, APIs and software projects.
Generators
How to Generate Secure Passwords
Learn what makes a password truly secure and how to create strong, unique credentials for every account.
Generators
How to Create a QR Code
Step-by-step guide to generating custom QR codes for URLs, WiFi networks, plain text and email.
Calculators
How to Calculate Your BMI
Understand Body Mass Index, how to interpret your result and what the WHO categories mean.
Calculators
How to Calculate Percentages
Master percentage calculations — increases, decreases, ratios and reverse percentages explained simply.
Calculators
How to Calculate Age from Date of Birth
Calculate exact age in years, months and days and understand how date arithmetic works.
Converters
How to Convert Currency Online
Convert between world currencies using live exchange rates and understand how currency conversion works.
Converters
How to Convert Temperature Units
Convert between Celsius, Fahrenheit and Kelvin with formulas and instant results explained.
Calculators
How to Calculate Your Mortgage Payment
Understand amortization, monthly installments and the true cost of a mortgage loan.
Dev Tools
How to Format Code Online
Format and beautify JSON, HTML, CSS, SQL and more — instantly in your browser.
Text Tools
How to Count Words and Characters Online
Count words, characters, sentences and reading time in any text — useful for writers, SEO and social media.
Color
How to Convert Color Codes (HEX, RGB, HSL)
Convert colors between HEX, RGB and HSL formats and understand when to use each in design.
Generators
What Is Lorem Ipsum and How to Use It
The history of Lorem Ipsum placeholder text and how to generate it for your design projects.
Color
How to Create a Color Palette
Generate harmonious color palettes from any base color using color theory principles.
Sports
How to Calculate Your Running Pace
Understand pace, speed and finish time calculations for runners of all levels.
Sports
How to Calculate Heart Rate Zones
Find your 5 training zones based on max heart rate and train more effectively.
Geo
How to Convert GPS Coordinates
Convert between decimal degrees, DMS and other GPS coordinate formats with ease.
Dev Tools
How to Use Regular Expressions (Regex)
A practical regex guide with real-world patterns for validation, search and text processing.
Converters
How to Convert Images Online
Convert JPG, PNG, WebP and other formats in your browser — no upload required.
Calculators
How to Calculate Compound Interest
Understand how compound interest grows your money and use it to plan your savings.
Dev Tools
How to Encode and Decode URLs
Learn what URL encoding is, when you need it and how to handle special characters in links.
Text Tools
How to Compare Two Texts Online
Find differences between two documents instantly with inline diff highlighting.