Can I use
?

PNG favicons

- LS

Icon used by browsers to identify a webpage or site. While all browsers support the .ico format, the PNG format can be preferable.

Chrome

  1. ✅ 4 - 141: Supported
  2. ✅ 142: Supported
  3. ✅ 143 - 145: Supported

Edge

  1. ✅ 12 - 141: Supported
  2. ✅ 142: Supported

Safari

  1. ✅ 3.1 - 26.0: Supported
  2. ✅ 26.1: Supported
  3. ✅ 26.2 - TP: Supported

Firefox

  1. ✅ 2 - 143: Supported
  2. ✅ 144: Supported
  3. ✅ 145 - 147: Supported

Opera

  1. ✅ 9 - 121: Supported
  2. ✅ 122: Supported

IE

  1. ❌ 5.5 - 10: Not supported
  2. ✅ 11: Supported

Chrome for Android

  1. ✅ 142: Supported

Safari on iOS

  1. ❌ 3.2 - 11.4: Not supported
  2. ✅ 12 - 18.6: Supported
  3. ✅ 26.0: Supported
  4. ✅ 26.1: Supported

Samsung Internet

  1. ✅ 4 - 28: Supported
  2. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ✅ 2.1 - 4.4.4: Supported
  2. ✅ 142: Supported

Firefox for Android

  1. ✅ 144: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported

Favicon support is a complicated topic. See this guide for more information.

See also SVG favicons.

Resources:
How to favicon in 2021