This functionality requires an How to add barcodes to Excel 365 and Excel for the Web
Add dynamic barcodes via the ActiveBarcode REST API into Excel 365 spreadsheets.
It's pure and simple. No Add-On and no script is required with this straight forward approach. Just use the url from the REST API directly in the IMAGE function and that's it. If the content of a cell changes, the barcode changes automatically, too.
=IMAGE(CONCAT("https://api.activebarcode.net/v1/png?code=CODE128&access=YOUR-KEY-HERE&text=";A1))
This screenshot shows the resulting barcode in Excel for Mac that encodes the content of cell A1.
And this screenshot shows the resulting barcode in Excel for Web.
It's pure and simple. No Add-On and no script is required with this straight forward approach. Just use the url from the REST API directly in the IMAGE function and that's it. If the content of a cell changes, the barcode changes automatically, too.
=IMAGE(CONCAT("https://api.activebarcode.net/v1/png?code=CODE128&access=YOUR-KEY-HERE&text=";A1))
This screenshot shows the resulting barcode in Excel for Mac that encodes the content of cell A1.
And this screenshot shows the resulting barcode in Excel for Web.