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Python script to check qr codes


After trying to generate some QR Codes with Stable Diffusion and checking them manualy with my smartphone, if they work or not, i created a python script with chat gpt where you only have to add an input, output folder and the value (URL) from your QR Code.

After starting the script, it takes around a minute for 2000 images to scan, and copys all working qrcodes in the output folder.

Python dependencies

pip install pillow pyzbar

Python script

import os
from PIL import Image
from pyzbar.pyzbar import decode

# Input folder with source images
input_folder = r'C:\Users\cosci\Daten\dev\python\sd-qr-checker\in'

# QRCode Value, for example a Domain
target_value = 'qrcode-value'

# Output folder where working qrcodes will be copied
output_folder = r'C:\Users\cosci\Daten\dev\python\sd-qr-checker\out'

# File Blacklist, for example Grid files
blacklist_filenames = ['grid']

# Check if output folder exists
if not os.path.exists(output_folder):

# Whitelist of supported File extensions
supported_extensions = ['.jpg', '.jpeg', '.png']

# generate file list and check qr codes
for filename in os.listdir(input_folder):
    if any(filename.lower().endswith(ext) for ext in supported_extensions) and all(item not in filename.lower() for item in blacklist_filenames):
        file_path = os.path.join(input_folder, filename)
        # decode qr codes
        image =
        decoded_objects = decode(image)
        # check qr code
        for obj in decoded_objects:
            qr_data ='utf-8')
            if qr_data == target_value:
                output_path = os.path.join(output_folder, filename)
                # copy qr code
                print(f"Success: {filename} copied.")