diff --git a/frontends/web/stego_worker.py b/frontends/web/stego_worker.py
index 62696c7..cc07784 100644
--- a/frontends/web/stego_worker.py
+++ b/frontends/web/stego_worker.py
@@ -98,6 +98,16 @@ def encode_operation(params: dict) -> dict:
     # Resolve channel key (v4.0.0)
     resolved_channel_key = _resolve_channel_key(params.get("channel_key", "auto"))
 
+    # DEBUG: Log what channel key the worker is using
+    import sys, os
+    from stegasoo.channel import get_channel_key, get_channel_key_hash
+    worker_channel_key = get_channel_key()
+    worker_channel_hash = get_channel_key_hash()
+    print(f"[WORKER ENCODE] cwd={os.getcwd()}", file=sys.stderr)
+    print(f"[WORKER ENCODE] channel_key param='{params.get('channel_key')}' -> resolved='{resolved_channel_key}'", file=sys.stderr)
+    print(f"[WORKER ENCODE] get_channel_key()={worker_channel_key}", file=sys.stderr)
+    print(f"[WORKER ENCODE] get_channel_key_hash()={worker_channel_hash[:8].hex() if worker_channel_hash else None}", file=sys.stderr)
+
     # Call encode with correct parameter names
     result = encode(
         message=payload,
@@ -151,6 +161,16 @@ def decode_operation(params: dict) -> dict:
     # Resolve channel key (v4.0.0)
     resolved_channel_key = _resolve_channel_key(params.get("channel_key", "auto"))
 
+    # DEBUG: Log what channel key the worker is using
+    import sys, os
+    from stegasoo.channel import get_channel_key, get_channel_key_hash
+    worker_channel_key = get_channel_key()
+    worker_channel_hash = get_channel_key_hash()
+    print(f"[WORKER DECODE] cwd={os.getcwd()}", file=sys.stderr)
+    print(f"[WORKER DECODE] channel_key param='{params.get('channel_key')}' -> resolved='{resolved_channel_key}'", file=sys.stderr)
+    print(f"[WORKER DECODE] get_channel_key()={worker_channel_key}", file=sys.stderr)
+    print(f"[WORKER DECODE] get_channel_key_hash()={worker_channel_hash[:8].hex() if worker_channel_hash else None}", file=sys.stderr)
+
     # Call decode with correct parameter names
     result = decode(
         stego_image=stego_data,