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 generate Gerber file
  4. How to export the drill files correctly?
  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. How to export the correct drilling layer from eagle
  12. What are the dimensions for Dielectric Separation thickness?
  13. What is the inner layer copper thickness?
  14. What is Blind/Buried Via?
  15. What is the The Min Track/Spacing for 1oz./2oz./3oz. Copper weight
  16. What is Half-cut/Castellated Holes.
  17. How can i do if i do not required to make plated through holes?
  18. The dimension for PCB
  19. The material for FR-4/Aluminum Board/FPC
  20. What is the thickness of Fusion PCB?
  21. The surface finish for PCB
  22. The color of solder mask
  23. The copper weight for PCB
  24. What is Impedance Control?
  25. PCB quantity
  26. How to generate Gerber files from PCBE
  27. How to generate Gerber file from Eagle
  28. How to generate Gerber files in Altium Designer
  29. How to generate Gerber files from CircuitMaker
  30. How to generate Gerber file from KiCAD
  31. How to generate Gerber files in DipTrace
  32. How to generate Gerber files from Proteus
  33. How to generate Gerber files from DesignSpark
  34. Recommend size for BGA
  35. Solder Mask Dam
  36. What is the difference between Fusion standard PCB and Fusion Advanced PCB?
  37. What should i do when my Gerber files over too big (over 4MB)?
  38. What is the Fusion Flex PCB thickness?

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