Is this converter private?

Yes. All conversions run locally in your browser — no values are sent to our servers.

What unit categories are supported?

We support length, mass, volume, temperature, speed, time, data storage, pressure, area and more.

Do I need an internet connection to use it?

After the initial page load the tool works offline since all processing happens on your device.

Convert Units — Free Online Converter

Convert units instantly and accurately in your browser — no sign-up or server calls required. Choose a category, select units, enter a value and get precise results formatted for readability. Works offline after the page loads.

Fast

Instant, accurate results

High-performance conversions with up to 9 significant digits — ideal for quick calculations and precision needs.

Private

Local on-device processing

All calculations occur in your browser. No numeric values are transmitted to any server, ensuring user privacy.

Comprehensive

Wide unit coverage

Supports length, mass, volume, area, temperature, speed, time, data storage, pressure and many more unit types.

Category Donate

Root font size (px)

From

13+ categories and hundreds of units available: length, mass, volume, area, temperature, data, time, pressure and more

How to use the converter

Select the category to filter available units (for example: Length, Temperature, Data).
Choose your source and destination units from the dropdown menus; use the search within a dropdown for faster selection.
Enter a numeric value — the result updates instantly and is shown with appropriate formatting.
Use the Copy Result button to copy the converted value or clear inputs to start a new conversion.

Supported units & categories

Quickly jump to the converter and pick a category to see available units. You can also explore all tools on the Products page. Use the category selector to filter units and the dropdown search to find a unit fast.