How to freeze packages installed only in the virtual environment?

For me (macOS) the following worked

path/to/venv/bin/pip3 freeze -l

You need to use the -l or --local option to freeze only the local packages (and not the global ones)

pip freeze -l > requirements.txt

Make sure you are working in the virtualenv before doing pip freeze -l.

Only local packages on virtual environment

pip freeze -l > requirements.txt # or --local instead of -l

Only local packages installed by the user on virtual environment

pip freeze --user > requirements.txt

See the documentation for further details: https://pip.pypa.io/en/stable/reference/pip_freeze/.

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