diff --git a/winziprint/winziprint.py b/winziprint/winziprint.py
index bb0fe8b..34e23ec 100755
--- a/winziprint/winziprint.py
+++ b/winziprint/winziprint.py
@@ -19,29 +19,34 @@ def convert(input_file_names: list[str], output_file_name: str, encoding: str =
     page_nums = []
     tmp_file_names = []
 
-    for i in range(0, len(input_file_names), BATCH_SIZE):
-        batch = input_file_names[i:i + BATCH_SIZE]
-        documents = []
-        for file_name in batch:
-            html = weasyprint.HTML(file_name, encoding=encoding)
-            doc = html.render()
-            documents.append(doc)
-            del html
-        all_pages = [p for doc in documents for p in doc.pages]
-        tmp_file_name = f'{output_file_name}.part.{i:0000}'
-        documents[0].copy(all_pages).write_pdf(tmp_file_name)
-        tmp_file_names.append(tmp_file_name)
-        page_nums += [len(doc.pages) for doc in documents]
-        del documents
-        del all_pages
-        gc.collect()
+    try:
+        for i in range(0, len(input_file_names), BATCH_SIZE):
+            batch = input_file_names[i:i + BATCH_SIZE]
+            documents = []
+            for file_name in batch:
+                html = weasyprint.HTML(file_name, encoding=encoding)
+                doc = html.render()
+                documents.append(doc)
+                del html
+            all_pages = [p for doc in documents for p in doc.pages]
+            tmp_file_name = f'{output_file_name}.part.{i:0000}'
+            documents[0].copy(all_pages).write_pdf(tmp_file_name)
+            tmp_file_names.append(tmp_file_name)
+            page_nums += [len(doc.pages) for doc in documents]
+            del documents
+            del all_pages
+            gc.collect()
 
-    merger = pypdf.PdfWriter()
-    for pdf in tmp_file_names:
-        merger.append(pdf)
-        os.remove(pdf)
-    merger.write(output_file_name)
-    merger.close()
+        merger = pypdf.PdfWriter()
+        for pdf in tmp_file_names:
+            merger.append(pdf)
+        merger.write(output_file_name)
+        merger.close()
+        del merger
+    finally:
+        for pdf in tmp_file_names:
+            if os.path.isfile(pdf):
+                os.remove(pdf)
 
     return page_nums
 
@@ -59,6 +64,8 @@ def _wrapper_convert(args: list[str], encoding: str = None) -> None:
         msg = str(e).replace('\n', ' ')
         print(f'error: {msg}', flush=True)
         traceback.print_exception(e)
+    finally:
+        gc.collect()
 
 
 def usage() -> None: