ISSN / ISMN Barcode Generator
Magazines and journals have an ISSN. On the cover it is printed as an EAN-13 barcode that starts with 977: the digits 977, the first seven digits of the ISSN, a two digit variant (00 unless the publisher uses it for price or edition) and a new EAN check digit. This tool builds those 13 digits for you and checks the ISSN check digit first (it can be an X).
Printed music has an ISMN, a barcode that starts with 9790. Books use the ISBN instead. Check or convert numbers with the ISBN converter and the check digit calculator. Issue numbers are usually added as a small 2 digit bar group next to the barcode (EAN-2). That add-on can be made in Print Label / PDF.