If you're looking to Download On Screen Barcode Reader on your Chromebook laptop Then read the following guideline.

On Screen Barcode Reader uses machine learning technology to instantly decode almost all industry standard barcodes and QR codes from your screen. You can quickly scan any barcode on your screen using a configurable global keyboard shortcut, the menubar icon or from the Scan button within the app. In addition to copying the barcode to clipboard, it is also saved within the app where you can add notes for future reference. Note: The app supports reading the following industry standard barcodes - PDF417 - QR - UPC - Code128 - Aztec - Code39 - Code93/i - DataMatrix - EAN8/13 - I2of5 - ITF14