> For the complete documentation index, see [llms.txt](https://docs.mapbox.com/mapbox-gl-js/llms.txt)
# Add a stretchable image to the map
This example uses a stretchable image as a background for text. Stretchable images allow some parts of the image to stretch while keeping other parts, such as corners, at a constant size. Set the `layout` property [`'icon-text-fit': 'both'`](https://docs.mapbox.com/style-spec/reference/layers/#layout-symbol-icon-text-fit) to use the image as background for the text.
> **Note (warning): Supported File Types**
>
> Only `.png`, `.jpg` and `.webp` formats are supported when loading images into a style at runtime using [`map.loadImage()`](https://docs.mapbox.com/mapbox-gl-js/api/map/#map#loadimage). Other file types like `.svg` are not supported.
> Example code:
**JavaScript**
```html
Add a stretchable image to the map
```
**React**
```jsx
import React, { useEffect, useRef } from 'react';
import * as mapboxgl from 'mapbox-gl/esm';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
mapRef.current = new mapboxgl.Map({
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
accessToken: 'YOUR_MAPBOX_ACCESS_TOKEN',
container: 'map',
style: 'mapbox://styles/mapbox/standard',
zoom: 0.5,
projection: 'winkelTripel'
});
const images = {
popup: 'https://docs.mapbox.com/mapbox-gl-js/assets/popup.png',
'popup-debug':
'https://docs.mapbox.com/mapbox-gl-js/assets/popup_debug.png'
};
loadImages(images, (loadedImages) => {
mapRef.current.on('load', () => {
mapRef.current.addImage('popup-debug', loadedImages['popup-debug'], {
// The two (blue) columns of pixels that can be stretched horizontally:
// - the pixels between x: 25 and x: 55 can be stretched
// - the pixels between x: 85 and x: 115 can be stretched.
stretchX: [
[25, 55],
[85, 115]
],
// The one (red) row of pixels that can be stretched vertically:
// - the pixels between y: 25 and y: 100 can be stretched
stretchY: [[25, 100]],
// This part of the image that can contain text ([x1, y1, x2, y2]):
content: [25, 25, 115, 100],
// This is a high-dpi image:
pixelRatio: 2
});
mapRef.current.addImage('popup', loadedImages['popup'], {
stretchX: [
[25, 55],
[85, 115]
],
stretchY: [[25, 100]],
content: [25, 25, 115, 100],
pixelRatio: 2
});
mapRef.current.addSource('points', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [40, -10]
},
properties: {
'image-name': 'popup-debug',
name: 'Line 1\nLine 2\nLine 3'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [40, 50]
},
properties: {
'image-name': 'popup',
name: 'Line 1\nLine 2\nLine 3'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-40, -10]
},
properties: {
'image-name': 'popup-debug',
name: 'One longer line'
}
},
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [-40, 50]
},
properties: {
'image-name': 'popup',
name: 'One longer line'
}
}
]
}
});
mapRef.current.addLayer({
id: 'points',
type: 'symbol',
source: 'points',
layout: {
'text-field': ['get', 'name'],
'icon-text-fit': 'both',
'icon-image': ['get', 'image-name'],
'icon-allow-overlap': true,
'text-allow-overlap': true
}
});
// the original, unstretched image for comparison
mapRef.current.addSource('original', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [
{
type: 'Feature',
geometry: {
type: 'Point',
coordinates: [0, -50]
}
}
]
}
});
mapRef.current.addLayer({
id: 'original',
type: 'symbol',
source: 'original',
layout: {
'text-field': 'unstretched image',
'icon-image': 'popup-debug',
'icon-allow-overlap': true,
'text-allow-overlap': true
}
});
});
});
function loadImages(urls, callback) {
const results = {};
for (const name in urls) {
mapRef.current.loadImage(urls[name], makeCallback(name));
}
function makeCallback(name) {
return (err, image) => {
results[name] = err ? null : image;
if (Object.keys(results).length === Object.keys(urls).length) {
callback(results);
}
};
}
}
}, []);
return ;
};
export default MapboxExample;
```