Welcome folks today in this blog post we will be building pdf viewer gui desktop app using pdf.js library in pyqt5. All the full source code of the application is shown below.

Get Started

In order to get started you need to install the following library using the pip command as shown below

pip install pyqt5

Now we need to download the stable version of pdf.js library from the below link

official pdf.js website

Just extract it inside your root directory like this

And now just make an app.py file and copy paste the following code

app.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
import os
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl
from PyQt5.QtWebEngineWidgets import QWebEngineView

PDFJS = f"file://{os.path.abspath('./web/viewer.html')}"
print(PDFJS)
PDF = f'file://{"%20".join(sys.argv[1:])}'
print("loading PDF:", PDF)

class Window(QWebEngineView):
    def __init__(self):
        super(Window, self).__init__()
        self.load(QUrl.fromUserInput(f'{PDFJS}?file={PDF}'))

if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = Window()
    window.showMaximized()
    sys.exit(app.exec_())

And now if you execute the above script by typing the below command as shown below

python app.py sample.pdf

So here we are providing the path of the input pdf file inside the command as shown above