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?
Web cams even on the lastest laptops are not going to read thise qr codes, either you need to buy an external hd webcam which may cost you $100 to huge price tags...
On the other side you can be a smartphone for less than $100 which is having 10 times better camera quality than a normal webcam.