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+# is-png [![Build Status](https://travis-ci.org/sindresorhus/is-png.svg?branch=master)](https://travis-ci.org/sindresorhus/is-png)
+
+> Check if a Buffer/Uint8Array is a [PNG](http://en.wikipedia.org/wiki/Portable_Network_Graphics) image
+
+Used by [image-type](https://github.com/sindresorhus/image-type).
+
+
+## Install
+
+```sh
+$ npm install --save is-png
+```
+
+
+## Usage
+
+##### Node.js
+
+```js
+var readChunk = require('read-chunk'); // npm install read-chunk
+var isPng = require('is-png');
+var buffer = readChunk.sync('unicorn.png', 0, 8);
+
+isPng(buffer);
+//=> true
+```
+
+##### Browser
+
+```js
+var xhr = new XMLHttpRequest();
+xhr.open('GET', 'unicorn.png');
+xhr.responseType = 'arraybuffer';
+
+xhr.onload = function () {
+	isPng(new Uint8Array(this.response));
+	//=> true
+};
+
+xhr.send();
+```
+
+
+## API
+
+### isPng(buffer)
+
+Accepts a Buffer (Node.js) or Uint8Array.
+
+It only needs the first 8 bytes.
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)