[ahlCVA]

It seems like it doesn't do this for Code 128 (possibly because it is variable-width?). It definitely works with EAN13 though - I tried it locally using only the TTF file.

[alex_suzuki]

Oh, interesting! I tried it in Word on macOS but didn't get it to work. But it works in the browser (question mark = calculates check digit).

It uses this, which i have no idea what it is :-) https://learn.microsoft.com/en-us/typography/opentype/spec/f...