diff --git a/commands/archive/lz77.py b/commands/archive/lz77.py
index e797158..d658bc9 100644
--- a/commands/archive/lz77.py
+++ b/commands/archive/lz77.py
@@ -7,7 +7,20 @@ from modules.core import fatal_error
 
 
 def handle_lz77_compress(args):
-    print("Compression is not implemented yet.")
+    input_path = pathlib.Path(args.input)
+    if args.output is not None:
+        output_path = pathlib.Path(args.output)
+    else:
+        output_path = pathlib.Path(input_path.name + ".lz77")
+
+    if not input_path.exists():
+        fatal_error(f"The specified file \"{input_path}\" does not exist!")
+
+    lz77_data = input_path.read_bytes()
+    data = libWiiPy.archive.compress_lz77(lz77_data)
+    output_path.write_bytes(data)
+
+    print("LZ77 file compressed!")
 
 
 def handle_lz77_decompress(args):