Web CryptographyBaseline · Widely available

The Web Cryptography API performs low-level cryptographic operations, such as encryption, decryption, and signature verification. Also known as the Web Crypto API.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Sep 19, 2017. Widely available since Mar 19, 2020.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–36Not supported

37+Supportedsince Aug 26, 2014

Current: 155

Edge

12+Supportedsince Jul 29, 2015

Current: 154

Firefox

1–33Not supported

34+Supportedsince Dec 1, 2014

Current: 157

Safari

1–10.1Not supported

11+Supportedsince Sep 19, 2017

Current: 27

MobileChrome Android

18–36Not supported

37+Supportedsince Sep 3, 2014

Current: 155

Firefox Android

4–33Not supported

34+Supportedsince Dec 1, 2014

Current: 157

Safari iOS

1–10.3Not supported

11+Supportedsince Sep 19, 2017

Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: Crypto.

Feature detection

JS · check before using

if ("Crypto" in globalThis) {
  // Crypto is available
} else {
  // load a polyfill or use a fallback
}

Documentation (MDN)

Specification

Usage share

caniuse.com/cryptography ↗

Sub-features

Support for each part of the feature (41). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
Crypto	11	12	21	5	18	21	5
Crypto.getRandomValues	11	12	21	5	18	21	5
Crypto.randomUUID	92	92	95	15.4	92	95	15.4
Crypto.subtle	37	12	34	11	37	34	11
Crypto.subtle.secure_context_required	60	79	75	15	60	79	15
CryptoKey	37	12	34	10	37	34	9
CryptoKey.algorithm	37	12	34	10	37	34	9
CryptoKey.extractable	37	12	34	10	37	34	9
CryptoKey.type	37	12	34	10	37	34	9
CryptoKey.usages	37	12	34	10	37	34	9
SubtleCrypto	37	12	34	11	37	34	11
SubtleCrypto.decrypt	37	79	34	11	37	34	11
SubtleCrypto.deriveBits	41	79	34	11	41	34	11
SubtleCrypto.deriveBits.x25519	133	133	130	17	133	130	17
SubtleCrypto.deriveKey	41	79	34	11	41	34	11
SubtleCrypto.deriveKey.derivedKeyAlgorithm_option_aes	41	79	34	11	41	34	11
SubtleCrypto.deriveKey.derivedKeyAlgorithm_option_hkdf	41	79	119	11	41	119	11
SubtleCrypto.deriveKey.derivedKeyAlgorithm_option_hmac	41	79	34	11	41	34	11
SubtleCrypto.deriveKey.derivedKeyAlgorithm_option_pbkdf2	41	79	119	11	41	119	11
SubtleCrypto.deriveKey.x25519	133	133	130	17	133	130	17

Show 21 more

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
SubtleCrypto.digest	41	79	34	11	41	34	11
SubtleCrypto.encrypt	37	79	34	11	37	34	11
SubtleCrypto.exportKey	37	79	34	11	37	34	11
SubtleCrypto.exportKey.ed25519	137	137	129	17	137	129	17
SubtleCrypto.exportKey.x25519	133	133	130	17	133	130	17
SubtleCrypto.generateKey	37	79	34	11	37	34	11
SubtleCrypto.generateKey.ed25519	137	137	129	17	137	129	17
SubtleCrypto.generateKey.x25519	133	133	130	17	133	130	17
SubtleCrypto.importKey	37	79	34	11	37	34	11
SubtleCrypto.importKey.ed25519	137	137	129	17	137	129	17
SubtleCrypto.importKey.x25519	133	133	130	17	133	130	17
SubtleCrypto.secure_context_required	60	79	75	15	60	79	15
SubtleCrypto.sign	37	79	34	11	37	34	11
SubtleCrypto.sign.ed25519	137	137	129	17	137	129	17
SubtleCrypto.unwrapKey	37	79	34	11	37	34	11
SubtleCrypto.verify	37	79	34	11	37	34	11
SubtleCrypto.verify.ed25519	137	137	129	17	137	129	17
SubtleCrypto.worker_support	37	79	48	11	37	48	11
SubtleCrypto.wrapKey	37	79	34	11	37	34	11
crypto	37	12	1	5	37	4	5
crypto.worker_support	37	79	48	10.1	37	48	10.3