# freeunitconvert.app

## Overview
freeunitconvert.app is a free online unit converter that runs entirely in the browser. It converts units across eight categories instantly with no server calls, no ads, and no sign-up.

## Categories and Units

### Length
Kilometer, Meter, Centimeter, Millimeter, Micrometer, Nanometer, Mile, Yard, Foot, Inch, Nautical Mile

### Weight
Kilogram, Gram, Milligram, Metric Ton, Pound, Ounce, Stone, US Ton, Imperial Ton

### Temperature
Celsius, Fahrenheit, Kelvin (uses exact formulas, not simple multiplication)

### Volume
Liter, Milliliter, Cubic Meter, Gallon (US), Gallon (UK), Quart, Pint, Cup, Fluid Ounce, Tablespoon, Teaspoon

### Area
Square Meter, Square Kilometer, Square Mile, Square Yard, Square Foot, Square Inch, Hectare, Acre

### Speed
m/s, km/h, mph, Knot, ft/s, Mach

### Data
Bit, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Kibibyte, Mebibyte, Gibibyte, Tebibyte

### Time
Nanosecond, Microsecond, Millisecond, Second, Minute, Hour, Day, Week, Month (30 days), Year (365 days)

## Features
- Instant conversion as you type (no button needed)
- Copy result to clipboard with one click
- Swap units button to reverse conversion direction
- Conversion formula and reference table displayed for every unit pair
- Dark mode with preference saved to localStorage
- Last-used category and units restored on reload
- Works offline (progressive web app with service worker)
- Fully responsive — works on desktop, tablet, and mobile
- No tracking, no cookies, no server-side processing

## Accuracy
All conversion factors use internationally recognized definitions. Results display up to 10 significant digits with automatic scientific notation for extreme values. Temperature uses exact formulas (C×9/5+32, etc.).

## Popular Conversion Pages
- Kilograms to Pounds: https://freeunitconvert.app/kg-to-lbs.html
- Celsius to Fahrenheit: https://freeunitconvert.app/celsius-to-fahrenheit.html
- Miles to Kilometers: https://freeunitconvert.app/miles-to-km.html
- Inches to Centimeters: https://freeunitconvert.app/inches-to-cm.html
- Pounds to Kilograms: https://freeunitconvert.app/lbs-to-kg.html

## URL
https://freeunitconvert.app/

## Extended Documentation
https://freeunitconvert.app/llms-full.txt