diff --git a/.gitignore b/.gitignore
index 8903637..c101bb0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,6 +13,8 @@ fotospiel-tenant-app
 /storage/*.key
 /storage/pail
 /vendor
+/clients/photobooth-uploader/**/bin
+/clients/photobooth-uploader/**/obj
 .env
 .env.backup
 .env.production
diff --git a/clients/photobooth-uploader/PhotoboothUploader.sln b/clients/photobooth-uploader/PhotoboothUploader.sln
deleted file mode 100644
index fa1a0eb..0000000
--- a/clients/photobooth-uploader/PhotoboothUploader.sln
+++ /dev/null
@@ -1,18 +0,0 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.10.35013.3
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PhotoboothUploader", "PhotoboothUploader\PhotoboothUploader.csproj", "{CDF88A75-8B20-4F54-96FC-A640B0D19A10}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{CDF88A75-8B20-4F54-96FC-A640B0D19A10}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{CDF88A75-8B20-4F54-96FC-A640B0D19A10}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{CDF88A75-8B20-4F54-96FC-A640B0D19A10}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{CDF88A75-8B20-4F54-96FC-A640B0D19A10}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-EndGlobal
diff --git a/clients/photobooth-uploader/PhotoboothUploader/App.axaml b/clients/photobooth-uploader/PhotoboothUploader/App.axaml
new file mode 100644
index 0000000..0947b43
--- /dev/null
+++ b/clients/photobooth-uploader/PhotoboothUploader/App.axaml
@@ -0,0 +1,10 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="PhotoboothUploader.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>
\ No newline at end of file
diff --git a/clients/photobooth-uploader/PhotoboothUploader/App.axaml.cs b/clients/photobooth-uploader/PhotoboothUploader/App.axaml.cs
new file mode 100644
index 0000000..d546bf9
--- /dev/null
+++ b/clients/photobooth-uploader/PhotoboothUploader/App.axaml.cs
@@ -0,0 +1,23 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+namespace PhotoboothUploader;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}
\ No newline at end of file
diff --git a/clients/photobooth-uploader/PhotoboothUploader/App.xaml b/clients/photobooth-uploader/PhotoboothUploader/App.xaml
deleted file mode 100644
index 8c2cbd7..0000000
--- a/clients/photobooth-uploader/PhotoboothUploader/App.xaml
+++ /dev/null
@@ -1,7 +0,0 @@
-<Application
-    x:Class="PhotoboothUploader.App"
-    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <Application.Resources>
-    </Application.Resources>
-</Application>
diff --git a/clients/photobooth-uploader/PhotoboothUploader/App.xaml.cs b/clients/photobooth-uploader/PhotoboothUploader/App.xaml.cs
deleted file mode 100644
index aa92a62..0000000
--- a/clients/photobooth-uploader/PhotoboothUploader/App.xaml.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-using Microsoft.UI.Xaml;
-
-namespace PhotoboothUploader;
-
-public partial class App : Application
-{
-    public App()
-    {
-        InitializeComponent();
-    }
-
-    protected override void OnLaunched(LaunchActivatedEventArgs args)
-    {
-        var window = new MainWindow();
-        window.Activate();
-    }
-}
diff --git a/clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml b/clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml
new file mode 100644
index 0000000..3464ddd
--- /dev/null
+++ b/clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml
@@ -0,0 +1,23 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="520" d:DesignHeight="360"
+        x:Class="PhotoboothUploader.MainWindow"
+        Width="520" Height="360"
+        Title="Fotospiel Photobooth Uploader">
+    <StackPanel Spacing="12" Margin="24" MaxWidth="420">
+        <TextBlock Text="Fotospiel Photobooth Uploader" FontSize="20" FontWeight="SemiBold" />
+        <TextBlock Text="Gib den 6-stelligen Verbindungscode ein." TextWrapping="Wrap" />
+        <TextBox x:Name="CodeBox" MaxLength="6" Watermark="123456" />
+        <Button x:Name="ConnectButton" Content="Verbinden" Click="ConnectButton_Click" />
+
+        <StackPanel Spacing="6">
+            <TextBlock Text="Upload-Ordner" FontWeight="SemiBold" />
+            <TextBlock x:Name="FolderText" Text="Noch nicht ausgewählt." TextWrapping="Wrap" />
+            <Button x:Name="PickFolderButton" Content="Ordner auswählen" Click="PickFolderButton_Click" IsEnabled="False" />
+        </StackPanel>
+
+        <TextBlock x:Name="StatusText" Text="Nicht verbunden." TextWrapping="Wrap" />
+    </StackPanel>
+</Window>
diff --git a/clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml.cs b/clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml.cs
similarity index 83%
rename from clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml.cs
rename to clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml.cs
index b9d92b1..16fa6a8 100644
--- a/clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml.cs
+++ b/clients/photobooth-uploader/PhotoboothUploader/MainWindow.axaml.cs
@@ -1,15 +1,16 @@
-using Microsoft.UI.Xaml;
+using System;
+using System.IO;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Platform.Storage;
+using Avalonia.Threading;
 using PhotoboothUploader.Models;
 using PhotoboothUploader.Services;
-using System.Linq;
-using System.IO;
-using Windows.Storage;
-using Windows.Storage.Pickers;
-using WinRT.Interop;
 
 namespace PhotoboothUploader;
 
-public sealed partial class MainWindow : Window
+public partial class MainWindow : Window
 {
     private const string DefaultBaseUrl = "https://fotospiel.app";
     private PhotoboothConnectClient _client;
@@ -28,7 +29,7 @@ public sealed partial class MainWindow : Window
         ApplySettings();
     }
 
-    private async void ConnectButton_Click(object sender, RoutedEventArgs e)
+    private async void ConnectButton_Click(object? sender, RoutedEventArgs e)
     {
         var code = (CodeBox.Text ?? string.Empty).Trim();
 
@@ -62,27 +63,27 @@ public sealed partial class MainWindow : Window
         ConnectButton.IsEnabled = true;
     }
 
-    private async void PickFolderButton_Click(object sender, RoutedEventArgs e)
+    private async void PickFolderButton_Click(object? sender, RoutedEventArgs e)
     {
-        var picker = new FolderPicker
+        var options = new FolderPickerOpenOptions
         {
-            SuggestedStartLocation = PickerLocationId.PicturesLibrary,
+            Title = "Upload-Ordner auswählen",
+            AllowMultiple = false,
         };
 
-        picker.FileTypeFilter.Add("*");
-        InitializeWithWindow.Initialize(picker, WindowNative.GetWindowHandle(this));
+        var folders = await StorageProvider.OpenFolderPickerAsync(options);
+        var folder = folders.FirstOrDefault();
+        var localPath = folder?.TryGetLocalPath();
 
-        StorageFolder? folder = await picker.PickSingleFolderAsync();
-
-        if (folder is null)
+        if (string.IsNullOrWhiteSpace(localPath))
         {
             return;
         }
 
-        _settings.WatchFolder = folder.Path;
+        _settings.WatchFolder = localPath;
         _settingsStore.Save(_settings);
 
-        FolderText.Text = folder.Path;
+        FolderText.Text = localPath;
         StartUploadPipelineIfReady();
     }
 
@@ -156,7 +157,7 @@ public sealed partial class MainWindow : Window
 
     private void UpdateStatus(string message)
     {
-        DispatcherQueue.TryEnqueue(() => StatusText.Text = message);
+        Dispatcher.UIThread.Post(() => StatusText.Text = message);
     }
 
     private string? ResolveUploadUrl(string? uploadUrl)
diff --git a/clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml b/clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml
deleted file mode 100644
index 046f0b2..0000000
--- a/clients/photobooth-uploader/PhotoboothUploader/MainWindow.xaml
+++ /dev/null
@@ -1,28 +0,0 @@
-<Window
-    x:Class="PhotoboothUploader.MainWindow"
-    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    Title="Fotospiel Photobooth Uploader"
-    Height="360"
-    Width="520">
-    <Grid Padding="24">
-        <StackPanel Spacing="16" MaxWidth="420">
-            <TextBlock Text="Fotospiel Photobooth Uploader" FontSize="20" FontWeight="SemiBold" />
-            <TextBlock Text="Gib den 6-stelligen Verbindungscode ein." TextWrapping="Wrap" />
-            <TextBox x:Name="CodeBox" MaxLength="6" PlaceholderText="123456">
-                <TextBox.InputScope>
-                    <InputScope>
-                        <InputScopeName NameValue="Number" />
-                    </InputScope>
-                </TextBox.InputScope>
-            </TextBox>
-            <Button x:Name="ConnectButton" Content="Verbinden" Click="ConnectButton_Click" />
-            <StackPanel Spacing="8">
-                <TextBlock Text="Upload-Ordner" FontWeight="SemiBold" />
-                <TextBlock x:Name="FolderText" Text="Noch nicht ausgewählt." TextWrapping="Wrap" />
-                <Button x:Name="PickFolderButton" Content="Ordner auswählen" Click="PickFolderButton_Click" IsEnabled="False" />
-            </StackPanel>
-            <TextBlock x:Name="StatusText" Text="Nicht verbunden." TextWrapping="Wrap" />
-        </StackPanel>
-    </Grid>
-</Window>
diff --git a/clients/photobooth-uploader/PhotoboothUploader/PhotoboothUploader.csproj b/clients/photobooth-uploader/PhotoboothUploader/PhotoboothUploader.csproj
index ba52229..6cfa712 100644
--- a/clients/photobooth-uploader/PhotoboothUploader/PhotoboothUploader.csproj
+++ b/clients/photobooth-uploader/PhotoboothUploader/PhotoboothUploader.csproj
@@ -1,19 +1,21 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
-    <UseWinUI>true</UseWinUI>
-    <EnableWindowsTargeting>true</EnableWindowsTargeting>
-    <DisableImplicitWindowsAppSDKRuntimeIdentifiers>true</DisableImplicitWindowsAppSDKRuntimeIdentifiers>
-    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
-    <RuntimeIdentifiers>win-x64</RuntimeIdentifiers>
-    <WindowsAppSDKRuntimeIdentifiers>win-x64</WindowsAppSDKRuntimeIdentifiers>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
-    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.5.240404000" />
+    <PackageReference Include="Avalonia" Version="11.3.10" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.10" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.10" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.10" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.10">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
   </ItemGroup>
-
 </Project>
diff --git a/clients/photobooth-uploader/PhotoboothUploader/Program.cs b/clients/photobooth-uploader/PhotoboothUploader/Program.cs
new file mode 100644
index 0000000..6e243f9
--- /dev/null
+++ b/clients/photobooth-uploader/PhotoboothUploader/Program.cs
@@ -0,0 +1,21 @@
+using Avalonia;
+using System;
+
+namespace PhotoboothUploader;
+
+class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}
diff --git a/clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs b/clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs
index 187c412..2f839dd 100644
--- a/clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs
+++ b/clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs
@@ -1,5 +1,9 @@
+using System;
+using System.Net.Http;
 using System.Net.Http.Json;
 using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
 using PhotoboothUploader.Models;
 
 namespace PhotoboothUploader.Services;
diff --git a/clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs b/clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs
index a5fcb3c..a74b5cd 100644
--- a/clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs
+++ b/clients/photobooth-uploader/PhotoboothUploader/Services/SettingsStore.cs
@@ -1,3 +1,5 @@
+using System;
+using System.IO;
 using System.Text.Json;
 using PhotoboothUploader.Models;
 
diff --git a/clients/photobooth-uploader/PhotoboothUploader/Services/UploadService.cs b/clients/photobooth-uploader/PhotoboothUploader/Services/UploadService.cs
index 8628813..4a36be7 100644
--- a/clients/photobooth-uploader/PhotoboothUploader/Services/UploadService.cs
+++ b/clients/photobooth-uploader/PhotoboothUploader/Services/UploadService.cs
@@ -1,6 +1,11 @@
+using System;
 using System.Collections.Concurrent;
+using System.IO;
+using System.Net.Http;
 using System.Net.Http.Headers;
+using System.Threading;
 using System.Threading.Channels;
+using System.Threading.Tasks;
 using PhotoboothUploader.Models;
 
 namespace PhotoboothUploader.Services;
diff --git a/clients/photobooth-uploader/PhotoboothUploader/app.manifest b/clients/photobooth-uploader/PhotoboothUploader/app.manifest
new file mode 100644
index 0000000..e91d42b
--- /dev/null
+++ b/clients/photobooth-uploader/PhotoboothUploader/app.manifest
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="PhotoboothUploader.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>