diff --git a/pdelfin/filter/filter.py b/pdelfin/filter/filter.py
index dee224a..f420495 100644
--- a/pdelfin/filter/filter.py
+++ b/pdelfin/filter/filter.py
@@ -60,6 +60,9 @@ class PdfFilter:
         word_counts = Counter(clean_text.split())
         total_words = len(clean_text.split())
 
+        if total_words == 0:
+            return False
+
         seo_score = sum(word_counts[word] for word in seo_words if word in word_counts)
 
         return (seo_score / total_words) > self.download_spam_threshold
@@ -107,3 +110,89 @@ class PdfFilter:
             return True  # Filter out
 
         return False  # Keep the PDF
+
+
+if __name__ == "__main__":
+    import tempfile
+    import boto3
+    from pdelfin.s3_utils import parse_s3_path
+    from concurrent.futures import ProcessPoolExecutor, as_completed
+    from tqdm import tqdm
+
+    # Quiet logs from pypdf
+    logging.getLogger("pypdf").setLevel(logging.ERROR)
+
+    def process_pdf(s3_path):
+        """
+        Process a single PDF file to determine if it should be kept or removed.
+        """
+        s3_bucket, s3_key = parse_s3_path(s3_path)
+        pdf_s3 = boto3.client("s3")
+
+        with tempfile.NamedTemporaryFile(suffix=".pdf", delete=True) as tmp_file:
+            pdf_s3.download_fileobj(s3_bucket, s3_key, tmp_file)
+            tmp_file.flush()
+
+            # Perform filtering logic
+            if filter.filter_out_pdf(tmp_file.name):
+                return s3_path, "remove"
+            else:
+                return s3_path, "keep"
+
+    # Load the list of S3 paths with a progress bar
+    with open("/home/ubuntu/s2pdf_paths_1M.txt", "r") as f:
+        s3_work_paths = list(filter(None, (line.strip() for line in tqdm(f, desc="Loading paths"))))
+
+    # Initialize the PDF filter
+    filter = PdfFilter(
+        languages_to_keep={Language.ENGLISH, None}, # none means could not detect language, that's okay keep it, might be an OCR
+        apply_download_spam_check=True,
+        apply_form_check=True,
+    )
+
+    # Output files
+    keep_path = "/home/ubuntu/s2pdf_paths_filter_keep.txt"
+    remove_path = "/home/ubuntu/s2pdf_paths_filter_remove.txt"
+
+    # Max number of concurrent futures
+    max_concurrent_futures = 1000
+
+    # Process the PDFs in parallel with limited concurrent futures
+    with open(keep_path, "w") as fkeep, open(remove_path, "w") as fremove:
+        with ProcessPoolExecutor(max_workers=max_concurrent_futures) as executor:
+            futures = {}
+            with tqdm(total=len(s3_work_paths), desc="Processing PDFs") as pbar:
+                for s3_path in s3_work_paths:
+                    # Submit a new future if we haven't reached the max_concurrent_futures
+                    future = executor.submit(process_pdf, s3_path)
+                    futures[future] = s3_path
+
+                    # Monitor completed futures
+                    try:
+                        while len(futures) >= max_concurrent_futures:
+                            for completed_future in as_completed(futures, timeout=0.1):
+                                s3_path = futures.pop(completed_future)
+                                try:
+                                    s3_path, result = completed_future.result()
+                                    if result == "keep":
+                                        fkeep.write(s3_path + "\n")
+                                    elif result == "remove":
+                                        fremove.write(s3_path + "\n")
+                                except Exception as e:
+                                    print(f"Error processing {s3_path}: {e}")
+                                pbar.update(1)
+                    except TimeoutError:
+                        pass
+
+                # Process remaining futures after all tasks have been submitted
+                for completed_future in as_completed(futures):
+                    s3_path = futures.pop(completed_future)
+                    try:
+                        s3_path, result = completed_future.result()
+                        if result == "keep":
+                            fkeep.write(s3_path + "\n")
+                        elif result == "remove":
+                            fremove.write(s3_path + "\n")
+                    except Exception as e:
+                        print(f"Error processing {s3_path}: {e}")
+                    pbar.update(1)