How to remove order number from your PCB?
For picking up your PCB easily and do not mix it up with other customers' PCBs, JLCPCB will add your order number to your PCB and the number will be added by random, the number may be under some IC, if you solder the PCB, it will be hidden then.
You're able to remove the order by choosing the below option. Please note that there will be an extra $1.50 charge for this service.
There is another option that you can specify a location of the order number and it is free of charge.
You can indicate this location by adding the text of " JLCJLCJLCJLC" to silk layer, and select the "Specify a location" option when you place an order. If this option hasn't been chosen, we may not notice you've added the text.
Note: Just "JLCJLCJLCJLC", No more or less characters. The font size should be larger than 0.8mm in height and 0.15 mm in width.
If you choose Panel by JLCPCB option when you place your order, then we will add the order number at the dirty edge by default, so there is no serial number on your product PCB.