diff --git a/scripts/find-dead-posts.php b/scripts/find-dead-posts.php
new file mode 100644
index 00000000..110b7f71
--- /dev/null
+++ b/scripts/find-dead-posts.php
@@ -0,0 +1,31 @@
+<?php
+require_once(__DIR__
+	. DIRECTORY_SEPARATOR . '..'
+	. DIRECTORY_SEPARATOR . 'src'
+	. DIRECTORY_SEPARATOR . 'Bootstrap.php');
+
+use Szurubooru\Injector;
+use Szurubooru\Dao\PublicFileDao;
+use Szurubooru\Dao\PostDao;
+
+$publicFileDao = Injector::get(PublicFileDao::class);
+$postDao = Injector::get(PostDao::class);
+
+$paths = [];
+foreach ($postDao->findAll() as $post)
+{
+	$paths[] = $post->getContentPath();
+	$paths[] = $post->getThumbnailSourceContentPath();
+}
+
+$paths = array_flip($paths);
+foreach ($publicFileDao->listAll() as $path)
+{
+	if (dirname($path) !== 'posts')
+		continue;
+	if (!isset($paths[$path]))
+	{
+		echo $path . PHP_EOL;
+		flush();
+	}
+}
diff --git a/src/Dao/FileDao.php b/src/Dao/FileDao.php
index e0828098..512996cb 100644
--- a/src/Dao/FileDao.php
+++ b/src/Dao/FileDao.php
@@ -44,10 +44,53 @@ class FileDao implements IFileDao
 		return $this->directory . DIRECTORY_SEPARATOR . $fileName;
 	}
 
+	public function listAll()
+	{
+		$iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->directory));
+		$files = [];
+		foreach ($iterator as $path)
+		{
+			if (!$path->isDir())
+				$files[] = $this->getRelativePath($this->directory, $path->getPathName());
+		}
+		return $files;
+	}
+
 	private function createFolders($fileName)
 	{
 		$fullPath = dirname($this->getFullPath($fileName));
 		if (!file_exists($fullPath))
 			mkdir($fullPath, 0777, true);
 	}
+
+	private function getRelativePath($from, $to)
+	{
+		$from = is_dir($from) ? rtrim($from, '\/') . '/' : $from;
+		$to = is_dir($to) ? rtrim($to, '\/') . '/' : $to;
+		$from = explode('/', str_replace('\\', '/', $from));
+		$to = explode('/', str_replace('\\', '/', $to));
+		$relPath = $to;
+		foreach($from as $depth => $dir)
+		{
+			if($dir === $to[$depth])
+			{
+				array_shift($relPath);
+			}
+			else
+			{
+				$remaining = count($from) - $depth;
+				if ($remaining > 1)
+				{
+					$padLength = (count($relPath) + $remaining - 1) * -1;
+					$relPath = array_pad($relPath, $padLength, '..');
+					break;
+				}
+				else
+				{
+					$relPath[0] = $relPath[0];
+				}
+			}
+		}
+		return implode('/', $relPath);
+	}
 }