Python 3 Tkinter Script to Encrypt PDF Documents With Password Using PyPDF2 Library GUI Desktop App

Welcome folks today in this blog post we will be building a tkinter desktop app where we will be allowing the user to encrypt pdf documents with password using the pypdf2 library. All the full source code of the application is shown below.

Get Started

In order to get started you need to make an app.py file and copy paste the following code

app.py

from tkinter import *
from tkinter import filedialog, simpledialog
from tkinter import ttk
import os
import PyPDF2

                        
# Create Tkinter window
root = Tk()
root.title("PDF Encryptor")

# Create main frame
main_frame = ttk.Frame(root, padding=20)
main_frame.grid(column=0, row=0, sticky="nsew")

# Create "Select PDF" label
select_pdf_label = ttk.Label(main_frame, text="Select PDF file to encrypt:")
select_pdf_label.grid(column=0, row=0, sticky="w")

# Create "Select PDF" button
select_pdf_button = ttk.Button(main_frame, text="Select PDF", command=encrypt_pdf)
select_pdf_button.grid(column=1, row=0, sticky="w")


# Configure main frame
main_frame.columnconfigure(0, weight=1)
main_frame.columnconfigure(1, weight=1)
main_frame.rowconfigure(0, weight=1)
main_frame.rowconfigure(1, weight=1)
main_frame.rowconfigure(2, weight=1)

root.mainloop()

from tkinter import *

from tkinter import filedialog, simpledialog

from tkinter import ttk

import os

import PyPDF2

# Create Tkinter window

root = Tk()

root.title("PDF Encryptor")

# Create main frame

main_frame = ttk.Frame(root, padding=20)

main_frame.grid(column=0, row=0, sticky="nsew")

# Create "Select PDF" label

select_pdf_label = ttk.Label(main_frame, text="Select PDF file to encrypt:")

select_pdf_label.grid(column=0, row=0, sticky="w")

# Create "Select PDF" button

select_pdf_button = ttk.Button(main_frame, text="Select PDF", command=encrypt_pdf)

select_pdf_button.grid(column=1, row=0, sticky="w")

# Configure main frame

main_frame.columnconfigure(0, weight=1)

main_frame.columnconfigure(1, weight=1)

main_frame.rowconfigure(0, weight=1)

main_frame.rowconfigure(1, weight=1)

main_frame.rowconfigure(2, weight=1)

root.mainloop()

As you can see we have a simple button where we allow the user to select the pdf file from the file system to encrypt and then we will be showing the messagebox to the user to enter the password to encrypt the pdf and then we will be allowing the user to enter the output filename where to save the encrypted pdf document and then we will be opening the pdf document automatically after it’s encrypted.

And now we need to write the function which will be encrypt_pdf() which will be executed once you click the button as shown below

# Function to encrypt PDF file
def encrypt_pdf():
    # Ask user to select input PDF file
    input_file_path = filedialog.askopenfilename(initialdir = "/", title = "Select file", filetypes = (("PDF files", "*.pdf"), ("All files", "*.*")))
    
    if input_file_path:
        # Ask user to enter password for encryption
        password = simpledialog.askstring("Password", "Enter password for encryption", show='*')
        
        if password:
            # Create encrypted PDF file
            output_file_path = filedialog.asksaveasfilename(initialdir = os.path.expanduser("~") + "/Documents", title = "Save encrypted file", initialfile = os.path.splitext(os.path.basename(input_file_path))[0] + "_encrypted.pdf", defaultextension=".pdf", filetypes = (("PDF files", "*.pdf"), ("All files", "*.*")))
            
            if output_file_path:
                with open(input_file_path, 'rb') as input_file:
                    pdf_reader = PyPDF2.PdfFileReader(input_file)
                    pdf_writer = PyPDF2.PdfFileWriter()
                    
                    for page_num in range(pdf_reader.numPages):
                        pdf_writer.addPage(pdf_reader.getPage(page_num))
                    
                    pdf_writer.encrypt(password)
                    
                    with open(output_file_path, 'wb') as output_file:
                        pdf_writer.write(output_file)
                        
                # Open encrypted PDF file
                os.startfile(output_file_path)

# Function to encrypt PDF file

def encrypt_pdf():

# Ask user to select input PDF file

input_file_path = filedialog.askopenfilename(initialdir = "/", title = "Select file", filetypes = (("PDF files", "*.pdf"), ("All files", "*.*")))

if input_file_path:

# Ask user to enter password for encryption

password = simpledialog.askstring("Password", "Enter password for encryption", show='*')

if password:

# Create encrypted PDF file

output_file_path = filedialog.asksaveasfilename(initialdir = os.path.expanduser("~") + "/Documents", title = "Save encrypted file", initialfile = os.path.splitext(os.path.basename(input_file_path))[0] + "_encrypted.pdf", defaultextension=".pdf", filetypes = (("PDF files", "*.pdf"), ("All files", "*.*")))

if output_file_path:

with open(input_file_path, 'rb') as input_file:

pdf_reader = PyPDF2.PdfFileReader(input_file)

pdf_writer = PyPDF2.PdfFileWriter()

for page_num in range(pdf_reader.numPages):

pdf_writer.addPage(pdf_reader.getPage(page_num))

pdf_writer.encrypt(password)

with open(output_file_path, 'wb') as output_file:

pdf_writer.write(output_file)

# Open encrypted PDF file

os.startfile(output_file_path)