diff --git a/Jellyfin.Api/Controllers/DlnaServerController.cs b/Jellyfin.Api/Controllers/DlnaServerController.cs
index 4e8c01577e..b1c576c330 100644
--- a/Jellyfin.Api/Controllers/DlnaServerController.cs
+++ b/Jellyfin.Api/Controllers/DlnaServerController.cs
@@ -9,6 +9,7 @@ using Emby.Dlna.Main;
 using Jellyfin.Api.Attributes;
 using Jellyfin.Api.Constants;
 using MediaBrowser.Controller.Dlna;
+using MediaBrowser.Model.Net;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
@@ -337,11 +338,7 @@ namespace Jellyfin.Api.Controllers
                 return NotFound();
             }
 
-            var contentType = "image/" + Path.GetExtension(fileName)
-                .TrimStart('.')
-                .ToLowerInvariant();
-
-            return File(icon.Stream, contentType);
+            return File(icon.Stream, MimeTypes.GetMimeType(fileName));
         }
 
         private string GetAbsoluteUri()
diff --git a/Jellyfin.Api/Controllers/ImageController.cs b/Jellyfin.Api/Controllers/ImageController.cs
index 86933074d0..e72589cfae 100644
--- a/Jellyfin.Api/Controllers/ImageController.cs
+++ b/Jellyfin.Api/Controllers/ImageController.cs
@@ -1878,8 +1878,8 @@ namespace Jellyfin.Api.Controllers
             if (!supportsWebP)
             {
                 var userAgent = Request.Headers[HeaderNames.UserAgent].ToString();
-                if (userAgent.IndexOf("crosswalk", StringComparison.OrdinalIgnoreCase) != -1 &&
-                    userAgent.IndexOf("android", StringComparison.OrdinalIgnoreCase) != -1)
+                if (userAgent.Contains("crosswalk", StringComparison.OrdinalIgnoreCase)
+                    && userAgent.Contains("android", StringComparison.OrdinalIgnoreCase))
                 {
                     supportsWebP = true;
                 }
@@ -1905,10 +1905,7 @@ namespace Jellyfin.Api.Controllers
 
         private bool SupportsFormat(IReadOnlyCollection<string> requestAcceptTypes, string acceptParam, ImageFormat format, bool acceptAll)
         {
-            var normalized = format.ToString().ToLowerInvariant();
-            var mimeType = "image/" + normalized;
-
-            if (requestAcceptTypes.Contains(mimeType))
+            if (requestAcceptTypes.Contains(format.GetMimeType()))
             {
                 return true;
             }
@@ -1918,6 +1915,8 @@ namespace Jellyfin.Api.Controllers
                 return true;
             }
 
+            // Review if this should be jpeg, jpg or both for ImageFormat.Jpg
+            var normalized = format.ToString().ToLowerInvariant();
             return string.Equals(acceptParam, normalized, StringComparison.OrdinalIgnoreCase);
         }
 
diff --git a/MediaBrowser.Model/Drawing/ImageFormatExtensions.cs b/MediaBrowser.Model/Drawing/ImageFormatExtensions.cs
new file mode 100644
index 0000000000..68a5c25345
--- /dev/null
+++ b/MediaBrowser.Model/Drawing/ImageFormatExtensions.cs
@@ -0,0 +1,27 @@
+using System.ComponentModel;
+using System.Net.Mime;
+
+namespace MediaBrowser.Model.Drawing;
+
+/// <summary>
+/// Extension class for the <see cref="ImageFormat" /> enum.
+/// </summary>
+public static class ImageFormatExtensions
+{
+    /// <summary>
+    /// Returns the correct mime type for this <see cref="ImageFormat" />.
+    /// </summary>
+    /// <param name="format">This <see cref="ImageFormat" />.</param>
+    /// <exception cref="InvalidEnumArgumentException">The <paramref name="format"/> is an invalid enumeration value.</exception>
+    /// <returns>The correct mime type for this <see cref="ImageFormat" />.</returns>
+    public static string GetMimeType(this ImageFormat format)
+        => format switch
+        {
+            ImageFormat.Bmp => "image/bmp",
+            ImageFormat.Gif => MediaTypeNames.Image.Gif,
+            ImageFormat.Jpg => MediaTypeNames.Image.Jpeg,
+            ImageFormat.Png => "image/png",
+            ImageFormat.Webp => "image/webp",
+            _ => throw new InvalidEnumArgumentException(nameof(format), (int)format, typeof(ImageFormat))
+        };
+}
diff --git a/MediaBrowser.Model/Net/MimeTypes.cs b/MediaBrowser.Model/Net/MimeTypes.cs
index ee8451853d..3b03466e9d 100644
--- a/MediaBrowser.Model/Net/MimeTypes.cs
+++ b/MediaBrowser.Model/Net/MimeTypes.cs
@@ -116,7 +116,6 @@ namespace MediaBrowser.Model.Net
             { "audio/x-wavpack", ".wv" },
 
             // Type image
-            { "image/jpg", ".jpg" },
             { "image/jpeg", ".jpg" },
             { "image/x-png", ".png" },
 
diff --git a/MediaBrowser.Providers/Manager/ItemImageProvider.cs b/MediaBrowser.Providers/Manager/ItemImageProvider.cs
index b1d73c4c41..0d1bdec585 100644
--- a/MediaBrowser.Providers/Manager/ItemImageProvider.cs
+++ b/MediaBrowser.Providers/Manager/ItemImageProvider.cs
@@ -14,6 +14,7 @@ using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.LiveTv;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Configuration;
+using MediaBrowser.Model.Drawing;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.MediaInfo;
@@ -172,7 +173,13 @@ namespace MediaBrowser.Providers.Manager
 
                         if (response.HasImage)
                         {
-                            if (!string.IsNullOrEmpty(response.Path))
+                            if (string.IsNullOrEmpty(response.Path))
+                            {
+                                var mimeType = response.Format.GetMimeType();
+
+                                await _providerManager.SaveImage(item, response.Stream, mimeType, imageType, null, cancellationToken).ConfigureAwait(false);
+                            }
+                            else
                             {
                                 if (response.Protocol == MediaProtocol.Http)
                                 {
@@ -195,12 +202,6 @@ namespace MediaBrowser.Providers.Manager
                                     await _providerManager.SaveImage(item, stream, mimeType, imageType, null, cancellationToken).ConfigureAwait(false);
                                 }
                             }
-                            else
-                            {
-                                var mimeType = "image/" + response.Format.ToString().ToLowerInvariant();
-
-                                await _providerManager.SaveImage(item, response.Stream, mimeType, imageType, null, cancellationToken).ConfigureAwait(false);
-                            }
 
                             downloadedImages.Add(imageType);
                             result.UpdateType |= ItemUpdateType.ImageUpdate;
diff --git a/tests/Jellyfin.Model.Tests/Drawing/ImageFormatExtensionsTests.cs b/tests/Jellyfin.Model.Tests/Drawing/ImageFormatExtensionsTests.cs
new file mode 100644
index 0000000000..7c3a7ff6c7
--- /dev/null
+++ b/tests/Jellyfin.Model.Tests/Drawing/ImageFormatExtensionsTests.cs
@@ -0,0 +1,33 @@
+using System;
+using System.ComponentModel;
+using MediaBrowser.Model.Drawing;
+using Xunit;
+
+namespace Jellyfin.Model.Drawing;
+
+public static class ImageFormatExtensionsTests
+{
+    private static TheoryData<ImageFormat> GetAllImageFormats()
+    {
+        var theoryTypes = new TheoryData<ImageFormat>();
+        foreach (var x in Enum.GetValues<ImageFormat>())
+        {
+            theoryTypes.Add(x);
+        }
+
+        return theoryTypes;
+    }
+
+    [Theory]
+    [MemberData(nameof(GetAllImageFormats))]
+    public static void GetMimeType_Valid_Valid(ImageFormat format)
+        => Assert.Null(Record.Exception(() => format.GetMimeType()));
+
+    [Theory]
+    [InlineData((ImageFormat)int.MinValue)]
+    [InlineData((ImageFormat)int.MaxValue)]
+    [InlineData((ImageFormat)(-1))]
+    [InlineData((ImageFormat)5)]
+    public static void GetMimeType_Valid_ThrowsInvalidEnumArgumentException(ImageFormat format)
+        => Assert.Throws<InvalidEnumArgumentException>(() => format.GetMimeType());
+}
diff --git a/tests/Jellyfin.Model.Tests/Net/MimeTypesTests.cs b/tests/Jellyfin.Model.Tests/Net/MimeTypesTests.cs
index 7b50c54b0d..cbab455f01 100644
--- a/tests/Jellyfin.Model.Tests/Net/MimeTypesTests.cs
+++ b/tests/Jellyfin.Model.Tests/Net/MimeTypesTests.cs
@@ -124,7 +124,6 @@ namespace Jellyfin.Model.Tests.Net
         [InlineData("font/woff2", ".woff2")]
         [InlineData("image/bmp", ".bmp")]
         [InlineData("image/gif", ".gif")]
-        [InlineData("image/jpg", ".jpg")]
         [InlineData("image/jpeg", ".jpg")]
         [InlineData("image/png", ".png")]
         [InlineData("image/svg+xml", ".svg")]