diff --git a/Sources/ocr.swift b/Sources/ocr.swift
index ed1d648..b3480f2 100644
--- a/Sources/ocr.swift
+++ b/Sources/ocr.swift
@@ -191,7 +191,7 @@ struct MacOSVisionOCR: ParsableCommand {
     }
 
     private func isImageFile(_ filePath: String) -> Bool {
-        let imageExtensions = ["jpg", "jpeg", "png", "webp"]
+        let imageExtensions = ["jpg", "jpeg", "png", "webp", "pdf"]
         return imageExtensions.contains((filePath as NSString).pathExtension.lowercased())
     }