Window atob() Method

Window Object Reference Window Object

Example

Decode a base-64 encoded string:

var str = "Hello World!";
var enc = window.btoa(str);
var dec = window.atob(enc);

var res = "Encoded String: " + enc + "<br>" + "Decoded String: " + dec;

The result of res will be:

Encoded String: SGVsbG8gV29ybGQh
Decoded String: Hello World!

Try it yourself »

Definition and Usage

The atob() method decodes a base-64 encoded string.

This method decodes a string of data which has been encoded by the btoa() method.


Browser Support

The numbers in the table specify the first browser version that fully supports the method.

Method
atob() Yes 10.0 1.0 Yes Yes

Syntax

window.atob(encodedStr)

Parameter Values

Parameter Description
encodedStr Required. The string which has been encoded by the btoa() method

Technical Details

Return Value: A String, representing the decoded string

Window Object Reference Window Object

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