diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -84,7 +84,7 @@
 
     if (shouldDisplayQRCodeInTerminal) {
       try {
-        const aes256Key = crypto.randomBytes(32);
+        const aes256Key = crypto.randomBytes(32).toString('hex');
         const ed25519Key = 'ed25519Key';
 
         const url = qrCodeLinkURL(aes256Key, ed25519Key);
diff --git a/lib/facts/links.js b/lib/facts/links.js
--- a/lib/facts/links.js
+++ b/lib/facts/links.js
@@ -6,7 +6,7 @@
 }
 
 /* QR Code */
-function qrCodeLinkURL(aes256Param: Uint8Array, ed25519Param: string): string {
+function qrCodeLinkURL(aes256Param: string, ed25519Param: string): string {
   const keys = {
     aes256: aes256Param,
     ed25519: ed25519Param,
diff --git a/native/qr-code/qr-code-screen.react.js b/native/qr-code/qr-code-screen.react.js
--- a/native/qr-code/qr-code-screen.react.js
+++ b/native/qr-code/qr-code-screen.react.js
@@ -5,6 +5,7 @@
 import QRCode from 'react-native-qrcode-svg';
 
 import { qrCodeLinkURL } from 'lib/facts/links.js';
+import { uintArrayToHexString } from 'lib/media/data-utils.js';
 
 import type { QRCodeSignInNavigationProp } from './qr-code-sign-in-navigator.react.js';
 import type { NavigationRoute } from '../navigation/route-names.js';
@@ -23,7 +24,9 @@
 
   const generateQRCode = React.useCallback(async () => {
     try {
-      const aes256Key: Uint8Array = await AES.generateKey();
+      const aes256: Uint8Array = await AES.generateKey();
+      const aes256Key: string = uintArrayToHexString(aes256);
+
       const ed25519Key: string = await getContentSigningKey();
 
       const url = qrCodeLinkURL(aes256Key, ed25519Key);
diff --git a/web/account/qr-code-login.react.js b/web/account/qr-code-login.react.js
--- a/web/account/qr-code-login.react.js
+++ b/web/account/qr-code-login.react.js
@@ -4,6 +4,7 @@
 import * as React from 'react';
 
 import { qrCodeLinkURL } from 'lib/facts/links.js';
+import { uintArrayToHexString } from 'lib/media/data-utils.js';
 
 import css from './qr-code-login.css';
 import { generateKey } from '../media/aes-crypto-utils.js';
@@ -21,7 +22,9 @@
         return;
       }
 
-      const aes256Key: Uint8Array = await generateKey();
+      const aes256: Uint8Array = await generateKey();
+      const aes256Key: string = uintArrayToHexString(aes256);
+
       const url = qrCodeLinkURL(aes256Key, ed25519Key);
       setQrCodeValue(url);
     } catch (err) {