Free Metric Conversion Calculator — File & Unit Converter Online
Use 93 browser-based file conversion tools and 1132 selected unit conversion pairs. Convert kg to lb, cm to inches, km to miles, and more without uploading your file to Metric Converter.
Your All-in-One Conversion Toolkit
Metric Converter is a free, open-source conversion toolkit that runs entirely in your browser — your files never leave your device.
How It Works
1. Choose Your Conversion
93 File Converters · 1132 Unit Converters
2. Convert Instantly
Conversions run in your browser with JavaScript, browser APIs, and WebAssembly where required. Processing time and download requirements depend on the file type and device.
3. Download or Copy
Download your converted file or copy the unit result. All data stays on your device and is deleted when you close the tab.
File Converters
JPEG Image to Portable Network Graphics
JPEG Image to WebP Image
JPEG Image to Portable Document Format
Portable Network Graphics to JPEG Image
Portable Network Graphics to WebP Image
Portable Network Graphics to Portable Document Format
WebP Image to JPEG Image
WebP Image to Portable Network Graphics
Unit Converters
Meter → Foot
Foot → Meter
Centimeter → Inch
Inch → Centimeter
Kilometer → Mile
Mile → Kilometer
Millimeter → Inch
Inch → Millimeter
All Unit Categories
Frequently Asked Questions
What is Metric Converter?
Metric Converter is a free online toolkit for file format conversions (JPG, PNG, WebP, GIF, etc.) and unit conversions (length, mass, temperature, and more). It runs entirely in your browser with no server uploads required.
Is my file data safe?
Yes. All file processing happens locally in your browser using client-side JavaScript and WebAssembly. Your files are never uploaded to any server. Once you close the tab, all data is gone.
What conversions are supported?
The current registry contains 179 units across 13 categories.
Do I need to pay?
No payment or account is required. The site is supported by advertising.
Can I use it offline?
An internet connection is recommended. Some previously loaded resources may be cached, but full offline support is not guaranteed for every converter.