Thanks for those helpful answers. Unfortunately, Blockchair could not read my qr code via the inbuilt cam. Are there any other site where I can scan the code via the cam to check the balance?
I don't think this has anything to do with the service itself; any QR reader should be able to extract the text from your QR Code. Maybe your camera is the problem? Are you using a webcam?
Anyway, I'm assuming your QR Code contains your Bitcoin address, in which case, you only need to scan it with your phone (which is way easier than using a webcam assuming you're using one), copy the text, then paste it to your preferred block explorer like
https://www.blockchain.com/explorer.