Can I use
?

Base64 encoding and decoding

- LS

Utility functions for of encoding and decoding strings to and from base 64: window.atob() and window.btoa().

Chrome

  1. 4 - 108: Supported
  2. 109: Supported
  3. 110 - 112: Supported

Edge

  1. 12 - 108: Supported
  2. 109: Supported

Safari

  1. 3.1 - 16.2: Supported
  2. 16.3: Supported
  3. TP: Supported

Firefox

  1. 2 - 108: Supported
  2. 109: Supported
  3. 110 - 111: Supported

Opera

  1. 9 - 10.1: Not supported
  2. 10.5: Support unknown
  3. 10.6 - 93: Supported
  4. 94: Supported

IE

  1. 5.5 - 9: Not supported
  2. 10: Supported
  3. 11: Supported

Chrome for Android

  1. 109: Supported

Safari on iOS

  1. 3.2 - 16.2: Supported
  2. 16.3: Supported

Samsung Internet

  1. 4 - 18.0: Supported
  2. 19.0: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10: Support unknown
  2. 11 - 12.1: Supported
  3. 73: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 4.4.4: Supported
  2. 109: Supported

Firefox for Android

  1. 109: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
Resources:
MDN Web Docs - atob()
MDN Web Docs - btoa()
Polyfill