Web Cryptography

- REC

JavaScript API for performing basic cryptographic operations in web applications

IE

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

Edge

12 - 18: Supported
79 - 102: Supported
103: Supported

Firefox

2 - 31: Not supported (but has polyfill available)
32 - 33: Disabled by default
34 - 100: Supported
101: Supported
102 - 103: Supported

Chrome

4 - 36: Not supported (but has polyfill available)
37 - 102: Supported
103: Supported
104 - 106: Supported

Safari

3.1 - 7: Not supported (but has polyfill available)
7.1 - 10.1: Supported
11 - 15.4: Supported
15.5: Supported
16.0 - TP: Supported

Opera

9 - 23: Not supported (but has polyfill available)
24 - 85: Supported
86: Supported
87: Supported

Safari on iOS

3.2 - 7.1: Not supported (but has polyfill available)
8 - 10.3: Supported
11 - 15.4: Supported
15.5: Supported
16.0: Supported

Opera Mini

all: Not supported

Android Browser

2.1 - 4.4.4: Not supported (but has polyfill available)
101: Supported

Opera Mobile

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

Chrome for Android

102: Supported

Firefox for Android

101: Supported

UC Browser for Android

12.12: Supported

Samsung Internet

4 - 16.0: Supported
17.0: Supported

QQ Browser

10.4: Supported

Baidu Browser

7.12: Supported

KaiOS Browser

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