diff --git a/split2upload.py b/split2upload.py
new file mode 100644
index 0000000..237ddc0
--- /dev/null
+++ b/split2upload.py
@@ -0,0 +1,76 @@
+import os
+from pathlib import Path
+
+PART_SIZE = 40 * 1024 * 1024 * 1024  # 40 GB
+CHUNK_SIZE = 1024 * 1024 * 1024      # 1 GB
+
+
+def split_gz_file(file_path: Path):
+    file_size = file_path.stat().st_size
+    print(f"\n[+] Processing: {file_path}")
+    print(f"    Size: {file_size / (1024**3):.2f} GB")
+
+    if file_size <= PART_SIZE:
+        print("    File smaller than 40GB, skip.")
+        return
+
+    prefix = file_path.stem       # filename without .gz
+    parent = file_path.parent     # original directory
+
+    # For example: bigfile.gz.part001
+    def part_name(n): 
+        return parent / f"{prefix}.gz.part{n:03d}"
+
+    part_num = 1
+    written = 0
+    out_file = None
+
+    with open(file_path, "rb") as f:
+        while True:
+            chunk = f.read(CHUNK_SIZE)
+            if not chunk:
+                break
+
+            # Open new part
+            if written == 0:
+                out_path = part_name(part_num)
+                out_file = open(out_path, "wb")
+                print(f"    [+] Creating {out_path.name}")
+
+            out_file.write(chunk)
+            written += len(chunk)
+
+            # Close part when reaching 40GB
+            if written >= PART_SIZE:
+                out_file.close()
+                print(f"    [✓] Finished part {part_num:03d}")
+                part_num += 1
+                written = 0
+
+        if out_file:
+            out_file.close()
+            print(f"    [✓] Finished part {part_num:03d}")
+
+    print(f"[OK] Finished splitting {file_path.name}\n")
+
+
+def scan_and_split(root_dir: str):
+    root = Path(root_dir)
+
+    print(f"Scanning directory: {root.resolve()}\n")
+
+    for path in root.rglob("*.gz"):
+        try:
+            if path.is_file():
+                split_gz_file(path)
+        except Exception as e:
+            print(f"[ERROR] Failed on {path}: {e}")
+
+
+if __name__ == "__main__":
+    import sys
+    if len(sys.argv) != 2:
+        print("Usage: python split_gz_auto.py <directory>")
+        exit(1)
+
+    scan_and_split(sys.argv[1])