diff --git a/app/AlbumSources/AlbumSourceBase.php b/app/AlbumSources/AlbumSourceBase.php
index 374e17f..a5ac38a 100644
--- a/app/AlbumSources/AlbumSourceBase.php
+++ b/app/AlbumSources/AlbumSourceBase.php
@@ -42,6 +42,11 @@ abstract class AlbumSourceBase
         return self::$albumSourceCache[$fullClassName];
     }
 
+    public function getConfiguration()
+    {
+        return $this->configuration;
+    }
+
     public function setAlbum(Album $album)
     {
         $this->album = $album;
diff --git a/app/AlbumSources/AmazonS3Source.php b/app/AlbumSources/AmazonS3Source.php
index 6694f5b..9ac3164 100644
--- a/app/AlbumSources/AmazonS3Source.php
+++ b/app/AlbumSources/AmazonS3Source.php
@@ -130,7 +130,19 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
      */
     public function getUrlToPhoto(Photo $photo, $thumbnail = null)
     {
-        return $this->getClient()->getObjectUrl($this->configuration->container_name, $this->getPathToPhoto($photo, $thumbnail));
+        $client = $this->getClient();
+
+        if ($this->configuration->s3_signed_urls)
+        {
+            $cmd = $client->getCommand('GetObject', [
+                'Bucket' => $this->configuration->container_name,
+                'Key' => $this->getPathToPhoto($photo, $thumbnail)
+            ]);
+
+            return $client->createPresignedRequest($cmd, '+5 minutes')->getUri();
+        }
+
+        return $client->getObjectUrl($this->configuration->container_name, $this->getPathToPhoto($photo, $thumbnail));
     }
 
     /**
@@ -144,7 +156,11 @@ class AmazonS3Source extends AlbumSourceBase implements IAlbumSource, IAnalysisQ
     {
         $photoPath = $this->getPathToPhoto($photo, $thumbnail);
 
-        $this->getClient()->upload($this->configuration->container_name, $photoPath, fopen($tempFilename, 'r+'), 'public-read');
+        $uploadAcl = $this->configuration->s3_signed_urls
+            ? 'private'
+            : 'public-read';
+
+        $this->getClient()->upload($this->configuration->container_name, $photoPath, fopen($tempFilename, 'r+'), $uploadAcl);
     }
 
     /**
diff --git a/app/AlbumSources/IAlbumSource.php b/app/AlbumSources/IAlbumSource.php
index 4e98635..aecce32 100644
--- a/app/AlbumSources/IAlbumSource.php
+++ b/app/AlbumSources/IAlbumSource.php
@@ -6,7 +6,6 @@ use App\Album;
 use App\Photo;
 use App\Storage;
 use Guzzle\Http\EntityBody;
-use Symfony\Component\HttpFoundation\File\File;
 
 interface IAlbumSource
 {
@@ -32,6 +31,12 @@ interface IAlbumSource
      */
     function fetchPhotoContent(Photo $photo, $thumbnail = null);
 
+    /**
+     * Gets the configuration of the source.
+     * @return mixed
+     */
+    function getConfiguration();
+
     /**
      * Gets the name of this album source.
      * @return string
diff --git a/app/Http/Controllers/Admin/StorageController.php b/app/Http/Controllers/Admin/StorageController.php
index 6a1c775..f4c53c0 100644
--- a/app/Http/Controllers/Admin/StorageController.php
+++ b/app/Http/Controllers/Admin/StorageController.php
@@ -55,12 +55,14 @@ class StorageController extends Controller
         $this->authorizeAccessToAdminPanel('admin:manage-storage');
 
         $filesystemDefaultLocation = sprintf('%s/storage/app/albums', dirname(dirname(dirname(dirname(__DIR__)))));
+        $storage = new Storage();
+        $storage->s3_signed_urls = true;
 
         return Theme::render('admin.create_storage', [
             'album_sources' => UserConfig::albumSources(),
             'filesystem_default_location' => $filesystemDefaultLocation,
             'info' => $request->session()->get('info'),
-            'storage' => new Storage()
+            'storage' => $storage
         ]);
     }
 
@@ -94,6 +96,7 @@ class StorageController extends Controller
         $storage->is_active = true;
         $storage->is_default = (strtolower($request->get('is_default')) == 'on');
         $storage->is_internal = false;
+        $storage->s3_signed_urls = (strtolower($request->get('s3_signed_urls')) == 'on');
 
         if ($storage->source != 'LocalFilesystemSource' && isset($storage->location))
         {
@@ -219,10 +222,12 @@ class StorageController extends Controller
             'cdn_url',
             'access_key',
             'secret_key',
-            'b2_bucket_type'
+            'b2_bucket_type',
+            's3_signed_urls'
         ]));
         $storage->is_active = (strtolower($request->get('is_active')) == 'on');
         $storage->is_default = (strtolower($request->get('is_default')) == 'on');
+        $storage->s3_signed_urls = (strtolower($request->get('s3_signed_urls')) == 'on');
 
         if ($storage->is_default && !$storage->is_active)
         {
diff --git a/app/Photo.php b/app/Photo.php
index a4fef8b..3a3e892 100644
--- a/app/Photo.php
+++ b/app/Photo.php
@@ -2,6 +2,7 @@
 
 namespace App;
 
+use App\AlbumSources\IAlbumSource;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Notifications\Notifiable;
 
@@ -110,9 +111,14 @@ class Photo extends Model
 
     public function thumbnailUrl($thumbnailName = null, $cacheBust = true)
     {
-        $url = $this->album->getAlbumSource()->getUrlToPhoto($this, $thumbnailName);
+        /** @var IAlbumSource $source */
+        $source = $this->album->getAlbumSource();
+        $sourceConfiguration = $source->getConfiguration();
 
-        if ($cacheBust)
+        $url = $source->getUrlToPhoto($this, $thumbnailName);
+
+        // Cache busting doesn't work with S3 signed URLs
+        if ($cacheBust && !$sourceConfiguration->s3_signed_urls)
         {
             // Append the timestamp of the last update to avoid browser caching
             $theDate = is_null($this->updated_at) ? $this->created_at : $this->updated_at;
diff --git a/database/migrations/2020_04_18_212642_add_s3_signed_urls_column_to_storages_table.php b/database/migrations/2020_04_18_212642_add_s3_signed_urls_column_to_storages_table.php
new file mode 100644
index 0000000..af6aff9
--- /dev/null
+++ b/database/migrations/2020_04_18_212642_add_s3_signed_urls_column_to_storages_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddS3SignedUrlsColumnToStoragesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('storages', function (Blueprint $table) {
+            $table->boolean('s3_signed_urls');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('storages', function (Blueprint $table) {
+            $table->dropColumn('s3_signed_urls');
+        });
+    }
+}
diff --git a/resources/lang/en/admin.php b/resources/lang/en/admin.php
index b844d06..1a8561a 100644
--- a/resources/lang/en/admin.php
+++ b/resources/lang/en/admin.php
@@ -323,7 +323,10 @@ return [
         'photos' => 'photo|photos',
         'users' => 'user|users',
     ],
+    'storage_auth_url_label_help' => 'Leave blank to authenticate with Amazon S3. For an S3-compatible provider, enter your provider\'s authentication URL here.',
     'storage_backblaze_access_key_id_help' => 'To use your account\'s master key, enter your account ID here.',
+    'storage_s3_signed_urls_help' => 'When enabled, Blue Twilight will upload your photos with a private ACL and will use signed URLs to display the photos to your visitors.',
+    'storage_s3_signed_urls_tooltip' => 'This location is set to use private images with signed URLs.',
     'storage_title' => 'Storage Locations',
     'sysinfo_panel' => 'System information',
     'sysinfo_widget' => [
diff --git a/resources/lang/en/forms.php b/resources/lang/en/forms.php
index 0e1cc96..14777d8 100644
--- a/resources/lang/en/forms.php
+++ b/resources/lang/en/forms.php
@@ -113,6 +113,7 @@ return [
     'storage_driver_label' => 'Storage driver:',
     'storage_endpoint_url_label' => 'Endpoint URL (leave blank if using Amazon):',
     'storage_location_label' => 'Physical location:',
+    'storage_s3_signed_urls' => 'Upload files privately and use signed URLs',
     'storage_secret_key_label' => 'Secret key:',
     'storage_service_name_label' => 'Service name:',
     'storage_service_region_label' => 'Region:',
diff --git a/resources/views/themes/base/admin/edit_storage.blade.php b/resources/views/themes/base/admin/edit_storage.blade.php
index c7d4705..56594cc 100644
--- a/resources/views/themes/base/admin/edit_storage.blade.php
+++ b/resources/views/themes/base/admin/edit_storage.blade.php
@@ -61,13 +61,13 @@
                         @include(Theme::viewName('partials.admin_storages_rackspace_options'))
                     @endif
 
-                    <div v-if="storage_driver == 'BackblazeB2Source'">
+                    @if ($storage->source == 'BackblazeB2Source')
                         <hr/>
                         @include(Theme::viewName('partials.admin_storages_backblaze_b2_options'))
-                    </div>
+                    @endif
 
                     <div class="text-right">
-                        <a href="{{ route('storage.index') }}" class="btn btn-default">@lang('forms.cancel_action')</a>
+                        <a href="{{ route('storage.index') }}" class="btn btn-link">@lang('forms.cancel_action')</a>
                         <button type="submit" class="btn btn-success"><i class="fa fa-fw fa-check"></i> @lang('forms.save_action')</button>
                     </div>
                 </form>
diff --git a/resources/views/themes/base/admin/list_storage.blade.php b/resources/views/themes/base/admin/list_storage.blade.php
index 036de62..fe68ddc 100644
--- a/resources/views/themes/base/admin/list_storage.blade.php
+++ b/resources/views/themes/base/admin/list_storage.blade.php
@@ -39,7 +39,12 @@
                                     <span style="color: #888; font-style: italic;">
                                         @if ($storage->source == 'LocalFilesystemSource'){{ $storage->location }}@endif
                                         @if ($storage->source == 'OpenStackSource'){{ $storage->container_name }} - {{ $storage->service_name }}, {{ $storage->service_region }}@endif
-                                        @if ($storage->source == 'AmazonS3Source'){{ $storage->container_name }} - {{ $storage->service_region }}@endif
+                                        @if ($storage->source == 'AmazonS3Source')
+                                            {{ $storage->container_name }} - {{ $storage->service_region }}
+                                            @if ($storage->s3_signed_urls)
+                                                <i class="fa fa-key ml-2" data-toggle="tooltip" title="@lang('admin.storage_s3_signed_urls_tooltip')"></i>
+                                            @endif
+                                        @endif
                                         @if ($storage->source == 'RackspaceSource'){{ $storage->container_name }} - {{ $storage->service_region }}@endif
                                     </span>
                                 </td>
@@ -80,4 +85,12 @@
             </div>
         </div>
     </div>
-@endsection
\ No newline at end of file
+@endsection
+
+@push('scripts')
+    <script type="text/javascript">
+        $(function () {
+            $('[data-toggle="tooltip"]').tooltip()
+        });
+    </script>
+@endpush
\ No newline at end of file
diff --git a/resources/views/themes/base/partials/admin_storages_amazon_s3_options.blade.php b/resources/views/themes/base/partials/admin_storages_amazon_s3_options.blade.php
index beadec0..5c92d85 100644
--- a/resources/views/themes/base/partials/admin_storages_amazon_s3_options.blade.php
+++ b/resources/views/themes/base/partials/admin_storages_amazon_s3_options.blade.php
@@ -55,10 +55,19 @@
 <div class="form-group">
     <label class="form-control-label" for="auth-url">@lang('forms.storage_auth_url_label')</label>
     <input type="text" class="form-control{{ $errors->has('auth_url') ? ' is-invalid' : '' }}" id="auth-url" name="auth_url" value="{{ old('auth_url', $storage->auth_url) }}">
+    <small class="form-text text-muted">@lang('admin.storage_auth_url_label_help')</small>
 
     @if ($errors->has('auth_url'))
         <div class="invalid-feedback">
             <strong>{{ $errors->first('auth_url') }}</strong>
         </div>
     @endif
+</div>
+
+<div class="form-check form-group">
+    <input type="checkbox" class="form-check-input" id="s3-signed-urls" name="s3_signed_urls"@if (old('s3_signed_urls', $storage->s3_signed_urls)) checked="checked"@endif>
+    <label for="s3-signed-urls" class="form-check-label">
+        <strong>@lang('forms.storage_s3_signed_urls')</strong><br>
+        @lang('admin.storage_s3_signed_urls_help')
+    </label>
 </div>
\ No newline at end of file