Web Cryptography

- REC

JavaScript API for performing basic cryptographic operations in web applications

Chrome

  1. 4 - 36: Not supported (but has polyfill available)
  2. 37 - 125: Supported
  3. 126: Supported
  4. 127 - 129: Supported

Edge

  1. 12 - 18: Supported
  2. 79 - 124: Supported
  3. 125: Supported

Safari

  1. 3.1 - 7: Not supported (but has polyfill available)
  2. 7.1 - 10.1: Supported
  3. 11 - 17.4: Supported
  4. 17.5: Supported
  5. 17.6 - TP: Supported

Firefox

  1. 2 - 31: Not supported (but has polyfill available)
  2. 32 - 33: Disabled by default
  3. 34 - 126: Supported
  4. 127: Supported
  5. 128 - 130: Supported

Opera

  1. 9 - 23: Not supported (but has polyfill available)
  2. 24 - 109: Supported
  3. 110: Supported

IE

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

Chrome for Android

  1. 125: Supported

Safari on iOS

  1. 3.2 - 7.1: Not supported (but has polyfill available)
  2. 8 - 10.3: Supported
  3. 11 - 17.4: Supported
  4. 17.5: Supported
  5. 17.6 - 18.0: Supported

Samsung Internet

  1. 4 - 24: Supported
  2. 25: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported (but has polyfill available)
  2. 125: Supported

Firefox for Android

  1. 126: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: 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
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