diff --git a/env.py b/env.py
index e0cbcd8a..c825bb8f 100644
--- a/env.py
+++ b/env.py
@@ -20,7 +20,7 @@ HTTPS_PROXY = os.getenv("HTTPS_PROXY", "").strip()
 AA_DONATOR_KEY = os.getenv("AA_DONATOR_KEY", "").strip()
 _AA_BASE_URL = os.getenv("AA_BASE_URL", "auto").strip()
 _AA_ADDITIONAL_URLS = os.getenv("AA_ADDITIONAL_URLS", "").strip()
-_SUPPORTED_FORMATS = os.getenv("SUPPORTED_FORMATS", "epub").lower()
+_SUPPORTED_FORMATS = os.getenv("SUPPORTED_FORMATS", "epub,mobi,azw3,fb2,djvu,cbz,cbr").lower()
 _BOOK_LANGUAGE = os.getenv("BOOK_LANGUAGE", "en").lower()
 _CUSTOM_SCRIPT = os.getenv("CUSTOM_SCRIPT", "").strip()
 FLASK_HOST = os.getenv("FLASK_HOST", "0.0.0.0")