diff --git a/lib/private/Preview/Generator.php b/lib/private/Preview/Generator.php
index 94fea7314b565..a2a330f881c67 100644
--- a/lib/private/Preview/Generator.php
+++ b/lib/private/Preview/Generator.php
@@ -34,6 +34,9 @@ class Generator {
 	public const SEMAPHORE_ID_ALL = 0x0a11;
 	public const SEMAPHORE_ID_NEW = 0x07ea;
 
+	/** The viewer only shows the max preview of images */
+	private const MAX_NON_IMAGE_PREVIEW_SIZE = 1024;
+
 	private array $cachedNumConcurrentPreviews = [];
 
 	public function __construct(
@@ -327,6 +330,10 @@ private function getMaxPreview(array $previews, File $file, string $mimeType, ?s
 
 		$maxWidth = $this->config->getSystemValueInt('preview_max_x', 4096);
 		$maxHeight = $this->config->getSystemValueInt('preview_max_y', 4096);
+		if (!str_starts_with($mimeType, 'image/')) {
+			$maxWidth = min($maxWidth, self::MAX_NON_IMAGE_PREVIEW_SIZE);
+			$maxHeight = min($maxHeight, self::MAX_NON_IMAGE_PREVIEW_SIZE);
+		}
 
 		try {
 			return $this->generateProviderPreview($file, $maxWidth, $maxHeight, false, true, $mimeType, $version);
diff --git a/tests/lib/Preview/GeneratorTest.php b/tests/lib/Preview/GeneratorTest.php
index 1b62768ef390d..a32a91a0190dd 100644
--- a/tests/lib/Preview/GeneratorTest.php
+++ b/tests/lib/Preview/GeneratorTest.php
@@ -483,6 +483,38 @@ public function testCorrectSize(int $maxX, int $maxY, int $reqX, int $reqY, bool
 		}
 	}
 
+	#[TestWith(['image/jpeg', 4096])]
+	#[TestWith(['text/plain', 1024])]
+	#[TestWith(['application/pdf', 1024])]
+	public function testMaxPreviewSize(string $mimeType, int $expectedSize): void {
+		$file = $this->getFile(42, $mimeType);
+
+		$this->getAutoMock(PreviewMapper::class)->method('getAvailablePreviews')
+			->willReturn([42 => []]);
+		$this->getAutoMock(IConfig::class)->method('getSystemValueInt')
+			->willReturnCallback(fn ($key, $default) => $default);
+
+		$provider = $this->createMock(IProviderV2::class);
+		$provider->method('isAvailable')->willReturn(true);
+		$this->getAutoMock(IPreview::class)->method('getProviders')
+			->willReturn(['/.*/' => ['provider']]);
+		$this->getAutoMock(GeneratorHelper::class)->method('getProvider')
+			->willReturn($provider);
+
+		$this->getAutoMock(GeneratorHelper::class)->expects($this->once())
+			->method('getThumbnail')
+			->with($provider, $file, $expectedSize, $expectedSize)
+			->willReturn($this->getMockImage($expectedSize, $expectedSize, 'my data'));
+
+		$this->getAutoMock(PreviewMapper::class)->method('insert')
+			->willReturnCallback(fn (Preview $preview): Preview => $preview);
+		$this->getAutoMock(StorageFactory::class)->method('writePreview')
+			->willReturn(1000);
+
+		$result = $this->generator->getPreview($file);
+		$this->assertSame("$expectedSize-$expectedSize-max.png", $result->getName());
+	}
+
 	public function testUnreadbleFile(): void {
 		$file = $this->createMock(File::class);
 		$file->method('isReadable')