diff --git a/fileserver/config/default/fileserver.conf b/fileserver/config/default/fileserver.conf
index f076ec1..4ba2b8f 100644
--- a/fileserver/config/default/fileserver.conf
+++ b/fileserver/config/default/fileserver.conf
@@ -10,6 +10,11 @@ delete {
     allow_batch: true
 }
 
+upload {
+    # the max size in Mb of the upload contents in one upload call
+    max_upload_size_mb: 0
+}
+
 cors {
     origins: "*"
 }
diff --git a/fileserver/fileserver.py b/fileserver/fileserver.py
index 2984b6c..a150fde 100644
--- a/fileserver/fileserver.py
+++ b/fileserver/fileserver.py
@@ -35,6 +35,9 @@ app.config["UPLOAD_FOLDER"] = first(
 app.config["SEND_FILE_MAX_AGE_DEFAULT"] = config.get(
     "fileserver.download.cache_timeout_sec", 5 * 60
 )
+if max_upload_size := config.get("fileserver.upload.max_upload_size_mb", None):
+    app.config["MAX_CONTENT_LENGTH"] = max_upload_size * 1024
+
 auth_handler = AuthHandler.instance()