Gerber inner routing layer 1
File type: 3d graphics, CAD-CAM-CAE file
Files with the g1 file extension are Gerber files containing the data for inner routing layer 1 of a printed circuit board (PCB).
The file is used in PCB design and manufacturing workflows, including those created with Altium Designer.
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: October 30, 2026
The g1 file extension identifies a Gerber image for inner routing layer 1. It describes the copper features on that PCB layer, such as tracks, pads, and other plotted shapes used to manufacture the board.
Altium Designer, from Altium, can generate this file as part of a PCB manufacturing output set. Other files in the set represent the board's remaining copper layers and may contain separate information for drilling or milling; the g1 file itself represents only inner routing layer 1.
Gerber remains a widely used manufacturing format. It is a plotting format rather than a complete, editable PCB design, so the corresponding Altium Designer project is preferable when design editing is required. Altium Designer is available for Microsoft Windows.
Open the g1 file in Altium Designer on Microsoft Windows, using its Gerber or CAM tools. A compatible Gerber viewer can also display the layer as a PCB manufacturing image.
Because the file represents only one PCB layer, it may be most useful when viewed together with the other Gerber and manufacturing files from the same output set.
A g1 file normally does not need conversion. It can be imported into compatible PCB manufacturing or CAM software and exported to another Gerber variant or manufacturing format when required.
To make design changes or recover editable PCB data, use the original Altium Designer project rather than converting the Gerber file. Gerber data does not retain the complete structure of the source PCB design.
Software apps that import g1 files:
Microsoft Windows
Software apps that export g1 files:
Microsoft Windows
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