The most basic JPG compressor I could come up with, using pillow antialiasing. Built in file extension check to avoid errors on PNG or other filetype input.

Python PIL (pillow) library, Python tkinter library (default on most environments), and of course Python3. Will not work with Python2.

pip install PIL

Download or clone file to your local system. CD into the directory.

cd /super-simple-jpg-compressor/

Run in Python interpreter

python main.py

If on macOS, you might need to specify Python version.

python3 main.py

Use the GUI to pick an input image, then, when prompted, use the GUI to save the file to output.