diff --git a/apps/as/src/shared/lib/use-tus.ts b/apps/as/src/shared/lib/use-tus.ts
index da054fd82..4f13dafbd 100644
--- a/apps/as/src/shared/lib/use-tus.ts
+++ b/apps/as/src/shared/lib/use-tus.ts
@@ -32,6 +32,28 @@ interface UseTusReturn {
   uploads: Record<string, Upload>;
 }
 
+const ALLOWED_EXTENSIONS: readonly string[] = [
+  // 문서
+  ".pdf",
+  ".txt",
+  ".hwp",
+  ".hwpx",
+  ".doc",
+  ".docx",
+  ".xls",
+  ".xlsx",
+  ".ppt",
+  ".pptx",
+  // 이미지
+  ".jpg",
+  ".jpeg",
+  ".png",
+  ".gif",
+  ".bmp",
+  // 압축
+  ".zip",
+];
+
 function getDefaultFileKey(file: File) {
   return `${file.name}::${file.lastModified}::${file.size}`;
 }
@@ -44,12 +66,16 @@ function useTus(options: UseTusOptions = {}): UseTusReturn {
 
   const validateFileType = useCallback(
     (file: File): boolean => {
-      if (!options.accept) return true;
-
-      const allowedExtensions = options.accept.split(",");
       const fileExtension = file.name.substring(file.name.lastIndexOf(".")).toLowerCase();
+      const acceptExtensions = options.accept
+        ?.split(",")
+        .map((extension) => extension.trim().toLowerCase());
 
-      if (!allowedExtensions.includes(fileExtension)) {
+      const isAllowed =
+        ALLOWED_EXTENSIONS.includes(fileExtension) &&
+        (!acceptExtensions || acceptExtensions.includes(fileExtension));
+
+      if (!isAllowed) {
         alert(`허용되지 않은 파일 형식입니다. (${fileExtension})`);
         return false;
       }