diff --git a/har_parser.py b/har_parser.py
index 3e20fe6..b3fc424 100644
--- a/har_parser.py
+++ b/har_parser.py
@@ -51,7 +51,13 @@ def main():
 
         if response_text is not None:
             # Ensure response_text is not None (it can be an empty string for 0-byte files)
-            data[key_from_query_param] = response_text
+            if key_from_query_param in data:
+                # If key exists, only update if new data is longer (preferring full images over thumbnails)
+                if len(response_text) > len(data[key_from_query_param]):
+                    data[key_from_query_param] = response_text
+            else:
+                # If key doesn't exist, add it
+                data[key_from_query_param] = response_text
 
     # Second loop to process JSON entries
     for entry in entries: