The FileReader interface's readAsArrayBuffer() method is used to start reading the contents of a specified Blob or File. When the read operation is finished, the readyState becomes DONE, and the loadend is triggered. At that time, the result attribute contains an ArrayBuffer representing the file's data.

Newer API available
The Blob.arrayBuffer() method is a newer promise-based API to read a file as an array buffer.




The Blob or File from which to read.


Specification Status Comment
File API
The definition of 'FileReader.readAsArrayBuffer' in that specification.
Working Draft Initial definition

Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
readAsArrayBufferChrome Full support 7Edge Full support 12Firefox Full support 3.6IE Full support 10Opera Full support 12Safari Full support 6WebView Android Full support ≤37Chrome Android Full support 18Firefox Android Full support 32Opera Android Full support 12Safari iOS Full support 6.1Samsung Internet Android Full support 1.0


Full support  
Full support

See also