diff --git a/src/index.ts b/src/index.ts
index cc72bcfbba..aa008ab6d3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -96,3 +96,5 @@ export type {
   JWTHeaderParameters,
   JSONWebKeySet,
 } from './types.d'
+
+export { default as cryptoRuntime } from './runtime/runtime.js'
diff --git a/src/runtime/browser/runtime.ts b/src/runtime/browser/runtime.ts
new file mode 100644
index 0000000000..b1c305748f
--- /dev/null
+++ b/src/runtime/browser/runtime.ts
@@ -0,0 +1,3 @@
+import { CryptoRuntime } from '../../types.d'
+
+export default 'WebCryptoAPI' as CryptoRuntime
diff --git a/src/runtime/node/runtime.ts b/src/runtime/node/runtime.ts
new file mode 100644
index 0000000000..1379e59835
--- /dev/null
+++ b/src/runtime/node/runtime.ts
@@ -0,0 +1,3 @@
+import { CryptoRuntime } from '../../types.d'
+
+export default 'node:crypto' as CryptoRuntime
diff --git a/src/types.d.ts b/src/types.d.ts
index 1bf12258c8..1ee6d56ff5 100644
--- a/src/types.d.ts
+++ b/src/types.d.ts
@@ -668,3 +668,5 @@ export interface CompactJWEHeaderParameters extends JWEHeaderParameters {
 export interface JSONWebKeySet {
   keys: JWK[]
 }
+
+export type CryptoRuntime = 'WebCryptoAPI' | 'node:crypto'