Web Cryptography

- REC

JavaScript API for performing basic cryptographic operations in web applications

IE

  1. 5.5: Not supported
  2. 6 - 10: Not supported (but has polyfill available)
  3. 11: Partial support

Edge

  1. 12 - 18: Supported
  2. 79 - 96: Supported
  3. 97: Supported

Firefox

  1. 2 - 31: Not supported (but has polyfill available)
  2. 32 - 33: Disabled by default
  3. 34 - 95: Supported
  4. 96: Supported
  5. 97 - 98: Supported

Chrome

  1. 4 - 36: Not supported (but has polyfill available)
  2. 37 - 96: Supported
  3. 97: Supported
  4. 98 - 100: Supported

Safari

  1. 3.1 - 7: Not supported (but has polyfill available)
  2. 7.1 - 10.1: Supported
  3. 11 - 15.1: Supported
  4. 15.2: Supported
  5. TP: Supported

Opera

  1. 9 - 23: Not supported (but has polyfill available)
  2. 24 - 81: Supported
  3. 82: Supported

Safari on iOS

  1. 3.2 - 7.1: Not supported (but has polyfill available)
  2. 8 - 10.3: Supported
  3. 11 - 15.1: Supported
  4. 15.2: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported (but has polyfill available)
  2. 97: Supported

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 64: Supported

Chrome for Android

  1. 97: Supported

Firefox for Android

  1. 95: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 14.0: Supported
  2. 15.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

Many browsers support the [crypto.getRandomValues()](#feat=getrandomvalues) method, but not actual cryptography functionality under crypto.subtle.

Resources:
Cross-browser cryptography library
MDN Web Docs - Web Crypto API
Test suite for various algorithms/methods
Support for recommended algorithms in Firefox
PKI.js - another crypto library for Public Key Infrastructure applications
Microsoft Research JavaScript Cryptography Library
Polyfill by Netflix with partial support
Web Cryptography API shim for IE11 and Safari - set of bugfixes and workarounds of prefixed api implementations
The History and Status of Web Crypto API