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Specifications
This help topic describes the specific characteristics of the barcodes per type.
| Barcode type | Character set | Length | Check digits |
|---|---|---|---|
| Code 128 | ASCII (128 characters) | variable | Mod 103 |
| Code 39 | [A-Z]; [0-9]; [ - . $ / + % ] | variable (avg. up to 20 chars) | optional (Mod. 43) |
| EAN-13 | numeric [0..9] | 13 digits | 1 check digit |
| EAN-8 | numeric [0..9] | 8 digits | 1 check digit |
| Postnet | numeric [0..9] | variable | 1 check digit |
| UPC-A | numeric [0..9] | 12 digits | 1 check digit |
| UPC-E | numeric [0..9] | 7 digits | 1 check digit |
Be sure to take the check digit into consideration as it decreases the total number of usable digits for your data. For example, if you need 8 digits for your data; you can't use EAN-8 because 8 total digits, minus one check digit, leaves only 7 usable digits.