diff --git a/scraper/scraper.py b/scraper/scraper.py
index 5116e67..d268a30 100644
--- a/scraper/scraper.py
+++ b/scraper/scraper.py
@@ -143,7 +143,11 @@ def generate_filename_from_url(url):
     Generates a filename from the given URL by replacing slashes with underscores.
     """
     # Use only the last part of the URL or replace slashes
-    return url.replace("https://", "").replace("http://", "").replace("/", "_")
+    filename = url.replace("https://", "").replace("http://", "").replace("/", "_")
+    # Sanitize filename to remove/replace invalid characters
+    import re
+    filename = re.sub(r'[\\/*?:"<>|]', "_", filename)
+    return filename
 
 
 def generate_safe_filename(name):