The atob() and btoa() global functions encode and decode strings to and from base 64, respectively.

Learning resources on MDN

• Window: atob() method
• Window: btoa() method

Browser support (view on caniuse.com)

• Chrome 30 Released on 2013-10-01
• Chrome Android 30 Released on 2013-10-02
• Edge 12 Released on 2015-07-29
• Firefox 4 Released on 2011-03-22
• Firefox for Android 4 Released on 2011-03-29
• Safari 10 Released on 2016-09-20
• Safari on iOS 10 Released on 2016-09-13

View web-platform-tests results for this feature - View the feature source file (dist) - Edit the feature - Report an issue about this feature