Capacitor Camera Plugin: Fixing Permission Crashes and Base64 Memory Bloat

The Crash That Only Happens on a Real Device

You wire up Camera.getPhoto() in your Capacitor app. It works in the browser. You build for iOS and Android. On iOS, tapping “Photo Library” kills the app instantly. On Android, a high-resolution photo returns a base64 string that seems fine until the app freezes or the activity restarts. The issue is not the plugin itself—it is that Capacitor’s Camera plugin delegates to native UI toolkits, and those toolkits enforce permission contracts and memory ceilings your web code never sees.

The takeaway: treat the Camera plugin as a native integration point, not a web API. That means declaring platform permissions explicitly, choosing between base64 and file-path workflows before you call getPhoto(), and pinning your plugin version.

Permissions Are Declared Twice, Requested Once

Capacitor plugins run inside a native shell. iOS requires usage description strings in Info.plist—the property list file that stores app configuration. Android requires entries in AndroidManifest.xml—the file that declares app components and permissions—plus runtime prompts.

On iOS, omitting NSPhotoLibraryAddUsageDescription causes immediate app termination when the picker accesses the photo library. This is a hard crash, not a catchable JavaScript error. You also need NSCameraUsageDescription if your users capture new photos.

On Android, dangerous permissions such as CAMERA and storage access require runtime prompts since Android 6.0. The plugin triggers the prompt, but you must still declare the permission in the manifest. For Android 10 and above, scoped storage changes how READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE behave, so verify the exact entries your target SDK level requires.

Where to declare them

Add the iOS usage descriptions to ios/App/App/Info.plist:

<key>NSPhotoLibraryAddUsageDescription</key>
<string>Save captured photos to your library</string>
<key>NSCameraUsageDescription</key>
<string>Take photos for your profile</string>

Add the Android permissions to android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

After editing native files, run npx cap sync from your project root. This command copies web assets and updates native projects. It requires Capacitor CLI v5 or later and standard user permissions. The expected check is that the generated Info.plist and AndroidManifest.xml contain the entries above.

Base64 Looks Convenient Until It Isn’t

Base64 is an encoding scheme that converts binary data into ASCII text. It inflates payload size by roughly 33 percent. A 5 MB JPEG becomes about 6.7 MB of text. Android activities commonly face a memory ceiling around 16 MB per activity on many devices, though the exact limit varies by OEM and OS version. Passing a large base64 string through the Capacitor bridge can push a WebView—the native browser engine rendering your app—over that limit, causing an out-of-memory restart.

The plugin options that control output size are quality (1–100, lower means more compression), targetWidth and targetHeight (downscale before encoding), and allowEditing (adds a crop step). The source option chooses between Camera for native capture and Photos for the library picker.

A Worked Example: Profile Photo Upload

Imagine a user takes a profile photo and your app uploads it to a REST API that accepts multipart form data—the standard HTTP encoding for file uploads. For anything larger than a thumbnail, use a file path instead of base64.

Request a downscaled file URI:

import { Camera, CameraResultType, CameraSource } from '@capacitor/camera';

const photo = await Camera.getPhoto({
  quality: 60,
  allowEditing: false,
  resultType: CameraResultType.Uri,
  source: CameraSource.Camera,
  width: 1024,
});

The returned photo.webPath or photo.path references a file on disk. Convert it to a blob and upload:

const response = await fetch(photo.webPath!);
const blob = await response.blob();
const formData = new FormData();
formData.append('photo', blob, 'profile.jpg');
await fetch('https://api.example.com/upload', {
  method: 'POST',
  body: formData,
});

Contrast that with a base64 request:

const photo = await Camera.getPhoto({
  quality: 90,
  resultType: CameraResultType.Base64,
});

Here photo.base64String can be several megabytes. To verify your configuration, add a temporary console.log(photo.base64String?.length) after the call. If the length is larger than expected, reduce quality or width. If you are using Uri, confirm the path resolves before uploading.

Version assumptions

Assume Capacitor CLI v5+ and @capacitor/camera v5.x. Plugin defaults can shift between major versions. Pin the version in package.json to avoid unexpected permission behavior changes during dependency updates.

Trade-offs and Limitations

Workflow	Memory profile	Best for	Risk
Base64	High; inflates payload ~33%	Tiny thumbnails, immediate display	Android OOM on large images
File URI (Uri)	Low; streams from disk	Uploads, gallery persistence	Requires fetch/blob conversion on web
DataUrl	Similar to Base64	Inline <img> src	Same memory ceiling as Base64

The plugin does not expose fine-grained control over the native picker’s memory buffer. If a user selects a 50 MP photo from their library, width and quality only downscale after the native decoder has loaded the original. On low-memory devices, the OS can kill the picker before your code runs. There is no Capacitor-side fix for that; it is an OS-level constraint.

Another limitation: allowEditing behaves differently across platforms. iOS presents a square crop UI, while Android’s crop intent varies by manufacturer. Do not assume identical UX.

How to Check Your Work

1. Run npx cap sync and confirm Info.plist contains the usage description keys and AndroidManifest.xml contains the camera permission.
2. Build to a physical device. The iOS Simulator lacks camera hardware and can mask permission prompts.
3. Trigger Camera.getPhoto() and watch the native permission dialog. Deny it once to confirm your app handles rejection gracefully.
4. If using base64, log the string length. If using Uri, log the path and verify the file resolves.

The Camera plugin is a thin bridge over two very different native camera stacks. The crashes you see are almost always permission declarations you skipped or a base64 payload you did not budget for. Declare the permissions, pick a result type that matches your memory budget, and test on real hardware.