What is Gerber file?

The Gerber format is an open 2D binary vector image file format. It is the standard file used by printed circuit board (PCB) industry software to describe the printed circuit board images: copper layers, solder mask, legend, etc.



Gerber files should be inside a .rar or.zip archive with standard file extensions:
Extension                       Layer
  • pcbname.GTL                 Top Copper 
  • pcbname.GTS                 Top Soldermask 
  • pcbname.GTO                 Top Silkscreen 

  • pcbname.GBL                 Bottom copper
  • pcbname.GBS                 Bottom Soldermask: 
  • pcbname.GBO                 Bottom Silkscreen: 
  • pcbname.TXT                  Drills
  • pcbname.GML/GKO        *Board Outline:
  • 
  • 4 layer board also need
  • pcbname.GL2                   Inner Layer2
  • pcbname.GL3                   Inner Layer3
Notes: Gerber file must be RS-274X format.  Drill file(pcbname.TXT) should be Excellon format.
PCB Outline is required. Drawing board outline in Eagle (layer 20).


Gerber file is used for the manufacturing process. 

Below is a picture on how to compress the necessary files.

Zipping gerbers



Fusion technical support

  1. What is Gerber file?
  2. What are the PCB panelization rules?
  3. How to export the drill files correctly?
  4. Can I use another software beside Eagle to generate the Gerber files?
  5. What is the correct way to draw the silkscreen on the bottom side?
  6. If my PCB does not require Solder Mask, what should I do?
  7. If my PCB do not require Drilling Holes, what should i do ?
  8. Which layer should I use in EAGLE for milling?
  9. What is the depth of the v- cut?
  10. If my PCB's do not have the silkscreen, how can I proceed with my PCBA order?
  11. Exporting manufacturing files from Altium Designer
  12. Export PCB gerber from Cam
  13. How to generate gerber from KiCAD?
  14. How to export the correct drilling layer from eagle
  15. What is the Minimum inner trace width for 4 layers?
  16. What is the minimum trace width?
  17. What are the dimensions for Dielectric Separation thickness?
  18. What is the inner layer copper thickness?
  19. What is the range for the drilling hole diameter?
  20. What is Blind/Buried Via?
  21. What is the The Min Track/Spacing for 1oz./2oz./3oz. Copper weight
  22. How to output drill file correctly ?
  23. Is the board outline could only be rectangle ?
  24. What is the layer?
  25. What is Half-cut/Castellated Holes.
  26. V-cut rules
  27. How can i do if i do not required to make plated through holes?
  28. Options of Fiducial
  29. What is the size of the Fiducial?
  30. How do plated through slots work on the Gerber ?
  31. The dimension for PCB
  32. The material for FR-4/Aluminum Board/FPC
  33. The thickness of PCB
  34. The surface finish for PCB
  35. The color of solder mask
  36. The copper weight for PCB
  37. What is Impedance Control?
  38. PCB quantity
  39. How to generate the gerber files from Altium Designer

Feedback and Knowledge Base