Free Online Tools for Everyone

Convert between meters, feet, inches, kilometers, miles, and other length units instantly. Fast and accurate length conversion calculator.

Convert between kilograms, pounds, grams, ounces, and other weight units instantly. Accurate weight conversion calculator.

Convert between Celsius, Fahrenheit, and Kelvin temperature scales instantly. Accurate temperature conversion calculator.

Convert between square meters, square feet, acres, hectares, and other area units instantly. Accurate area conversion calculator.

Convert between liters, gallons, cubic meters, cups, and other volume units instantly. Accurate volume conversion calculator.

Convert between miles per hour, kilometers per hour, knots, meters per second, and other speed units instantly.

Convert Unix timestamps (seconds or milliseconds) to readable dates and convert dates back to timestamps. Includes local time, UTC, and ISO 8601 outpu...

Calculate the number of days, weeks, months, or years between two dates. Find out how much time has passed or how long until a future date with our ea...

Add or subtract days, months, or years from any date. Calculate future deadlines, expiration dates, or past dates quickly and accurately with our date...

Calculate your Body Mass Index and get insights into your weight status. Check whether your weight falls within a healthy range based on your height a...

Format, beautify, and validate JSON data to make it more readable and error-free. Perfect for developers working with APIs, configuration files, and d...

Encode text to Base64 or decode Base64 strings back to readable text. Great for data encoding, image handling, and API authentication.

Generate QR codes from text, URLs, or contact info with custom size, margin, and colors. Download your QR code instantly.