Web/API/FileReader/readAsArrayBuffer

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.

Syntax

instanceOfFileReader.readAsArrayBuffer(blob);

Parameters

blob

The Blob or File from which to read.

Specifications

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

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
readAsArrayBuffer	Chrome Full support 7	Edge Full support 12	Firefox Full support 3.6	IE Full support 10	Opera Full support 12	Safari Full support 6	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 32	Opera Android Full support 12	Safari iOS Full support 6.1	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

See also

• FileReader

FileReader.readAsArrayBuffer() by Mozilla Contributors is licensed under CC-BY-SA 2.5.