Converters

Unit Converter

Convert between units across eight categories. Values update as you type, and you can swap the two sides with one click.

Runs entirely in your browser — nothing is uploaded

Category

From

To

Common conversions

Reference conversions for the selected category
From	Equals

Good to know

Conversions use exact SI definitions where they exist, so an inch is precisely 25.4 mm.
Temperature is handled separately from the other categories because it uses offsets, not simple ratios.

Roman Numeral Converter

Numbers to Roman numerals and back again.

Image Format Converter

Convert between PNG, JPG and WebP with a quality dial.

Image to Base64

Encode an image as a data URI for CSS or HTML.