diff --git a/quicktex/cli/__init__.py b/quicktex/cli/__init__.py
new file mode 100644
index 0000000..ac236ca
--- /dev/null
+++ b/quicktex/cli/__init__.py
@@ -0,0 +1,15 @@
+import click
+from encode import encode
+from decode import decode
+
+
+@click.group()
+def cli():
+    """Encode and Decode various image formats"""
+
+
+cli.add_command(encode)
+cli.add_command(decode)
+
+if __name__ == '__main__':
+    cli()
diff --git a/quicktex/cli/decode.py b/quicktex/cli/decode.py
new file mode 100644
index 0000000..d31a881
--- /dev/null
+++ b/quicktex/cli/decode.py
@@ -0,0 +1,16 @@
+import click
+import io
+import os
+from PIL import Image
+
+
+@click.command()
+@click.option('-f', '--flip', type=bool, default=True, show_default=True, help="vertically flip image after converting")
+@click.option('-r', '--remove', help="remove input images after converting")
+@click.option('-o', '--output', help="output file name. Must only specify one input image.")
+@click.option('-s', '--suffix', type=str, default='', help="suffix to append to output file(s).")
+@click.argument('filenames', nargs=-1, type=click.Path(exists=True))
+def decode(flip, remove, output, suffix, filenames):
+    """Decode an input texture file to an image"""
+    for filename in filenames:
+        assert filename.endswith(".dds"), "Incorrect file extension"
diff --git a/quicktex/cli/encode.py b/quicktex/cli/encode.py
new file mode 100644
index 0000000..5a77d0e
--- /dev/null
+++ b/quicktex/cli/encode.py
@@ -0,0 +1,6 @@
+import click
+
+
+@click.group()
+def encode():
+    """Encode an input image to a texture file of the given format"""
diff --git a/quicktex/dds.py b/quicktex/dds.py
index 3794f18..f4be690 100644
--- a/quicktex/dds.py
+++ b/quicktex/dds.py
@@ -5,6 +5,7 @@ import struct
 import typing
 
 
+@typing.final
 class PixelFormat:
     """
     DDS header surface format.
@@ -98,6 +99,7 @@ class PixelFormat:
         return data
 
 
+@typing.final
 class DDSHeader:
     """
     Header for a microsoft DDS file
@@ -213,6 +215,7 @@ class DDSHeader:
         return data
 
 
+@typing.final
 class DDSFile:
     """
     A microsoft DDS file, containing header information and one or more textures
diff --git a/quicktex/image_utils.py b/quicktex/image_utils.py
index 183556a..8b4919d 100644
--- a/quicktex/image_utils.py
+++ b/quicktex/image_utils.py
@@ -46,7 +46,7 @@ def mip_sizes(dimensions: typing.Tuple[int, int], mip_count: typing.Optional[int
         Resulting mip chain will be smaller if a 1x1 mip level is reached before this value.
     :return: A list of 2-tuples representing the dimensions of each mip level, including ``dimensions`` at element 0.
     """
-    assert all([dim > 0 for dim in dimensions]), "Invalid source size"
+    assert all([dim > 0 for dim in dimensions]), "Invalid source dimensions"
     if not mip_count:
         mip_count = math.ceil(math.log2(max(dimensions)))  # maximum possible number of mips for a given source
 
diff --git a/setup.py b/setup.py
index a313f4c..e91d9af 100644
--- a/setup.py
+++ b/setup.py
@@ -118,5 +118,9 @@ setup(
         "tests": ["nose", "parameterized"],
         "docs": ["sphinx", "myst-parser", "sphinx-rtd-theme"],
     },
+    entry_points='''
+        [console_scripts]
+        quicktex=quicktex.cli:cli
+    ''',
     zip_safe=False,
 )