There are many barcode symbologies. Some common ones are the postal barcode used for mail routing, the Universal Product Codes used in the retail trades, MSI barcodes used in grocery stores, and the Code 3 of 9 symbology often used for data tracking and inventory.  Bars & Stripes can produce standards compliant barcodes for 11 popular symbologies.  Information for each barcode standard is presented here.

Codabar

First and last character must be A, B, C, or D.
Other characters are 0 - 9  or  ‘+’,  ‘ - ’,  ‘$’,  ‘ /’,  ‘ : ’,  ‘ . ’

Code 128

full ASCII character set

Code 39 (3 of 9)

A - Z, 0 - 9,   space,  ‘ + ’,  ‘ . ’,  ‘ - ’,  ‘ / ’,  ‘ $ ’,  ‘ % ’

Code 39 (full ASCII)

full ASCII character set

Code 93

full ASCII character set

EAN 8

fixed length, 7 digits, 0 - 9

EAN 13

fixed length, 12 digits, 0 - 9

Interleaved 2 of 5

any length, digits,  0 - 9

MSI

any length, digits,  0 - 9

Postal / Postnet

fixed length, 5, 9, 11 digits,  0 - 9

UPC-A

fixed length, 11 digits,  0 - 9

UPC-E

fixed length, 6 digits, 0 - 9,   last digit must be  >   5