A GBL file contains the descriptions of the bottom copper layer of a printed circuit board (PCB) and generally functions as an input file for a photoplotter used in the fabrication of such boards. The GBL format is part of the Gerber group, which includes over 20 extensions that function as standards in the PCB industry. Similar formats include GTS, GTL and GBS.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple GBL files as once.
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