I don’t know if other people have easier methods but I found this useful software/app that enables you to use your smartphone to scan barcode information to your PC or Mac. I used it to add a bunch of PSA serial numbers to my excel collection record. I made a quick Youtube guide which I will post below, hope it is helpful to others!
Thanks this is good to know! I registered and keep meaning to do something with it but I have trying to catch up with my spreadsheet first as it has my other data such as purchasing and sales etc.