diff --git a/README.md b/README.md
index 1de571d5..7b919cfd 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@
       - [With Yarn/NPM](#with-yarnnpm)
       - [Vanilla JS](#vanilla-js)
     - [RemoteResource](#remoteresource)
+    - [PenumbraFile](#penumbrafile)
     - [.get](#get)
     - [.encrypt](#encrypt)
       - [.encrypt() examples:](#encrypt-examples)
@@ -134,6 +135,35 @@ type RemoteResource = {
 };
 ```
 
+### PenumbraFile
+
+Encryption & decryption APIs work on PenumbraFile descriptors to that store file data and metadata.
+
+```ts
+/** Penumbra file composition */
+export interface PenumbraFile extends Omit<RemoteResource, 'url'> {
+  /** Backing stream */
+  stream: ReadableStream;
+  /** File size (if backed by a ReadableStream) */
+  size?: number;
+  /** Optional ID for tracking encryption completion */
+  id?: number | string;
+  /** Last modified date */
+  lastModified?: Date;
+}
+```
+
+Native File objects can be converted for use with penumbra APIs through `penumbra.importFile(file: File, path?: string)` and can be used to encrypt and decrypt files.
+
+```ts
+// Automatically encrypt & save files selected in a file selector
+const fileSelector = document.getElementById('file-selector');
+fileSelector.addEventListener('change', (event) => {
+  const file = await penumbra.importFile(event.target.files[0]);
+  penumbra.encrypt(file).then(penumbra.save);
+});
+```
+
 ### .get
 
 Fetch and decrypt remote files.
@@ -346,7 +376,7 @@ await writer.close();
 
 ### .setWorkerLocation
 
-Configure the location of Penumbra's worker threads.
+Configure the location of Penumbra's worker threads. This should be called before any other Penumbra methods and is not currently reconfigurable post-initialization.
 
 ```ts
 penumbra.setWorkerLocation(location: WorkerLocationOptions | string): Promise<void>
diff --git a/package.json b/package.json
index a6627eff..5763b8b9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@transcend-io/penumbra",
-  "version": "5.3.2",
+  "version": "5.4.1",
   "description": "Crypto streams for the browser.",
   "main": "dist/main.penumbra.js",
   "types": "ts-build/src/index.d.ts",
diff --git a/src/API.ts b/src/API.ts
index 6b20e98e..889e3747 100644
--- a/src/API.ts
+++ b/src/API.ts
@@ -581,9 +581,26 @@ function getTextOrURI(files: PenumbraFile[]): Promise<PenumbraTextOrURI>[] {
   });
 }
 
+/**
+ * Convert HTML File object to a PenumbraFile
+ *
+ * @param file - File to import
+ * @param path - File path
+ * @returns PenumbraFile
+ */
+async function importFile(file: File, path?: string): Promise<PenumbraFile> {
+  return {
+    stream: new Response(await file.arrayBuffer()).body as ReadableStream,
+    size: file.size,
+    mimetype: file.type,
+    path,
+  };
+}
+
 const penumbra = {
   preconnect,
   preload,
+  importFile,
   get,
   encrypt,
   decrypt,
diff --git a/src/mock.ts b/src/mock.ts
index fc406bfe..90f51d97 100644
--- a/src/mock.ts
+++ b/src/mock.ts
@@ -9,6 +9,12 @@ const supported = (): PenumbraSupportLevel => -0;
 supported.levels = PenumbraSupportLevel;
 
 const MOCK_API: PenumbraAPI = {
+  importFile: async (file, path) => ({
+    stream: new Response(await file.arrayBuffer()).body as ReadableStream,
+    size: file.size,
+    mimetype: file.type,
+    path,
+  }),
   get: async () => [],
   save: () => new AbortController(),
   supported,