Its a simple djano project of a pdf merger website and in feature there will add option for file extension changeing. If you are a learner and learing django then this github repo will help you to understand that how does django code works and how to make a pdf merger website .
python3
django
PyPDF2
Its very simple to run and use this program in your loclhost and we will also see how to host it over the internet but useing portforwading services
python mange.py runserver
Run mange.py fille from your CMD or terminal to start the server it will run on port no - 8000 now open your browser and type
http://localhost:8000/
or
localhost:8000
Then the interface of the will apper to you and now you can use it
In order to do that you should have port forwarding services like ngrok,cloudflare,telebit etc. >First start your portforwarding service for port no 8000 and copy the forwarding link provided by the portforwarding service (like - https://example.io.)Now open pdfmerger folder and open settings.py in your editor
and add this fleid in this code under the ALLOWED_HOSTS and add your forwaring link both of them
ALLOWED_HOSTS=['localhost','exampel.io'] #add without https or http
CSRF_TRUSTED_ORIGINS=['https://example.io'] # add with https or http
Now its ready to use from over the internet by putiing the forwarding link in any browser