Then use `Icon` component with icon name or data as "icon" parameter:
```jsx
<Iconicon="mdi-light:home"/>
```
Component will automatically retrieve data for "mdi-light:home" from Iconify API and render it. There are over 100,000 icons available on Iconify API from various free and open source icon sets, including all the most popular icon sets.
## Offline Usage
Retrieving icon data from Iconify API requires visitor to be online. What if you want to use component offline or on local network?
If you want to use icon component without relying on public Iconify API, there are several options:
1. You can import icon data from Iconify Icons packages.
2. You can create custom icon bundles (more efficient, but requires more coding).
3. You can host your own Iconify API instead of relying on third party service.
See [offline use documentation](https://docs.iconify.design/iconify-icon/without-api.html) or [Iconify API documentation](https://docs.iconify.design/sources/api/).
Example above might fail with Next.js. This is because Next.js uses outdated packaging software that does not support ES modules. But do not worry, there is a simple solution: switch to CommonJS icon packages.
To switch to CommonJS package, replace this line in example above:
```js
import home from '@iconify-icons/mdi-light/home';
```
with
```js
import home from '@iconify/icons-mdi-light/home';
```
All icons are available as ES modules for modern bundler and as CommonJS modules for outdated bundlers. ES modules use format `@iconify-icons/{prefix}`, CommonJS modules use `@iconify/icons-{prefix}`.
For more details, see [icon packages documentation](https://docs.iconify.design/sources/npm/).
## Icon component properties
`icon` property is mandatory. It tells component what icon to render. The value can be a string containing the icon name or an object containing the icon data.
The icon component has the following optional properties:
-`inline`. Changes icon behaviour to match icon fonts. If set to `true`, it adds vertical alignment to icon to render it below text baseline, so it fits nicely in text.
By default, icon height is "1em". With is dynamic, calculated using the icon's width to height ratio. This makes it easy to change icon size by changing `font-size` in the stylesheet, just like icon fonts.
There are several ways to change icon dimensions:
- Setting `font-size` in style (or `fontSize` if you are using inline style).
- Setting `width` and/or `height` property.
Values for `width` and `height` can be numbers or strings.
If you set only one dimension, another dimension will be calculated using the icon's width to height ratio. For example, if the icon size is 16 x 24, you set the height to 48, the width will be set to 32. Calculations work not only with numbers, but also with string values.
#### Dimensions as numbers
You can use numbers for `width` and `height`.
```jsx
<Iconicon={homeIcon}height={24}/>
```
```jsx
<Iconicon="mdi-light:home"width={16}height={16}/>
```
Number values are treated as pixels. That means in examples above, values are identical to "24px" and "16px".
#### Dimensions as strings without units
If you use strings without units, they are treated the same as numbers in an example above.
Be careful when using `calc`, view port based units or percentages. In SVG element they might not behave the way you expect them to behave and when using such units, you should consider settings both width and height.
#### Dimensions as 'auto'
Keyword "auto" sets dimensions to the icon's `viewBox` dimensions. For example, for 24 x 24 icon using `height="auto"` sets height to 24 pixels.
```jsx
<Iconicon="mdi-light:home"height="auto"/>
```
### Icon colour
There are two types of icons: icons that do not have a palette and icons that do have a palette.
Icons that do have a palette, such as emojis, cannot be customised. Setting colour to such icons will not change anything.
Icons that do not have a palette can be customised. By default, colour is set to "currentColor", which means the icon's colour matches text colour. To change the colour you need to change text color.
This might seem redundant because icon can also be rotated and flipped using CSS transformations. So why do transformation properties exist? Because it is a different type of transformation.
- CSS transformations transform the entire icon.
- Icon transformations transform the contents of the icon.
If you have a square icon, this makes no difference. However, if you have an icon that has different width and height values, it makes a huge difference.
Rotating 16x24 icon by 90 degrees results in:
- CSS transformation keeps 16x24 bounding box, which might cause the icon to overlap text around it.
- Icon transformation changes bounding box to 24x16, rotating content inside an icon.
