Position the barcode so that it’s unlikely to get folded when placed in an envelope, and position it far enough from the edges of the page so that it won’t get clipped off during printing or faxing.
Position it so that it can be easily seen and scanned. If a handheld scanner will be used, avoid barcodes wider than 4 inches (10.3 cm). Tall, narrow barcodes generally work best in this case. Also, avoid compressing the contents of the barcode when using a handheld scanner.
Make sure that the size of the barcode can accommodate the amount of data to encode. If the barcode area is too small, it turns a solid gray. Be sure to test a completed form before distributing it to make sure that the barcode area is large enough.