diff --git a/exfiltrate.py b/exfiltrate.py
index a1ca3b1..52a8157 100644
--- a/exfiltrate.py
+++ b/exfiltrate.py
@@ -30,6 +30,7 @@ if __name__ == '__main__':
     parser.add_argument('--bbox', required=True, type=str, metavar='Bounding Box', nargs='+', default=(None, None, None, None), help='Bounding Box of the area to download. Separate each value with a space. (top left lat, top left lon, bottom right lat, bottom right lon)')
     parser.add_argument('--no-download', action='store_true', help="Don't do any downloading or image checking.")
     parser.add_argument('--download-loops', default=1, type=int, help='Sometimes the tiles are downloaded incorrectly. Re-running the download process can fix these corrupted tiles. This arg specifies how many times to run the download process. Default: 1')
+    parser.add_argument('--convert', action='store_true', help="Convert tiles to PNG.")
     args = parser.parse_args()
 
     if args.download_loops <= 0:
@@ -79,7 +80,7 @@ if __name__ == '__main__':
             else:
                 col_bar = tqdm(total=len(col_iter), leave=False)
                 with (ThreadPoolExecutor(args.dl_threads) as executor):
-                    futures = [executor.submit(download_tile, (row, col, args.base_url, r_headers, tiles_output, args.proxy)) for col in col_iter]
+                    futures = [executor.submit(download_tile, (row, col, args.base_url, r_headers, tiles_output, args.proxy, args.convert)) for col in col_iter]
                     for future in as_completed(futures):
                         result = future.result()
                         if result:
diff --git a/pkg/image.py b/pkg/image.py
index 4fac620..2c4bdba 100644
--- a/pkg/image.py
+++ b/pkg/image.py
@@ -20,7 +20,8 @@ def is_png(file_path):
     """
     try:
         img = Image.open(file_path)
-        return img.format == 'PNG'
+        img.verify()
+        return img.format == 'PNG', img.format
     except PIL.UnidentifiedImageError as e:
         # tqdm.write(str(e))
-        return False
+        return False, None
diff --git a/pkg/thread.py b/pkg/thread.py
index 76468bf..016c342 100644
--- a/pkg/thread.py
+++ b/pkg/thread.py
@@ -2,6 +2,7 @@ import shutil
 from pathlib import Path
 
 import requests
+from PIL import Image
 from tqdm import tqdm
 
 from pkg.proxies import PROXIES
@@ -16,25 +17,34 @@ def del_path(p: Path):
 
 
 def download_tile(task):
-    row, col, base_url, r_headers, output, use_proxy = task
+    row, col, base_url, r_headers, output, use_proxy, convert_to_png = task
     corrupted_image = False
     try:
         output_path: Path = output / f"{row}_{col}.png"
         if output_path.exists():
-            if not is_png(output_path):
+            valid_png_file, image_type = is_png(output_path)
+            if not valid_png_file:
                 # We will re-download the image. Don't need to delete it, just overwrite it.
                 # del_path(output_path)
                 corrupted_image = True
-                tqdm.write(f'Cannot identify image file: "{output_path}", deleting and retrying...')
+                tqdm.write(f'Cannot identify image file: "{output_path}" (is {image_type}), deleting and retrying...')
             else:
                 return row, col, 'exist'
         tile_url = f"{base_url}/{row}/{col}".replace('//', '/').replace(':/', '://')
         response = requests.get(tile_url, headers=r_headers, proxies=PROXIES if use_proxy else None, timeout=60)
         if response.status_code == 200:
-            if not response.headers.get('Content-Type') == 'image/png':
+            if not convert_to_png and not response.headers.get('Content-Type') == 'image/png':
+                # If we will convert the image to a PNG, ignore this header.
                 raise Exception(f'Response gave Content-Type: {response.headers.get("Content-Type")}')
             with open(output_path, "wb") as f:
                 f.write(response.content)
+
+            if convert_to_png:
+                img = Image.open(output_path)
+                if img.format != 'PNG':
+                    img.save(output_path, format='PNG')
+                    tqdm.write(f'Converted {output_path} from {img.format} to PNG')
+
             # Recheck the PNG if it was corrupted.
             if corrupted_image and not is_png(output_path):
                 print(f"Retry for {row}_{col} failed a second time: cannot identify image file")