How to Create a PCB Gerber File for PCB Manufacturing

How to Create a PCB Gerber File for PCB Manufacturing (Step-by-Step Guide)

Gerber file PCB is the most important manufacturing format used in modern electronics production. It acts as the universal language between PCB designers and manufacturers, ensuring that every copper track, drill hole, solder mask, and silkscreen layer is produced exactly as intended. Without a proper PCB output file, even a well-executed design can fail during fabrication due to misinterpretation.

Today, most PCB manufacturers rely on Gerber files to convert CAD (Computer-Aided Design) designs into physical boards. Whether using tools like KiCad, Altium Designer, or Eagle, properly generating Gerber files is essential for accurate production, and a well-prepared design ensures the output is manufacturing-ready and error-free.

What is a PCB Gerber File?

A Gerber file acts as a bridge between design and manufacturing, ensuring precision during PCB fabrication.

A Gerber file is a 2D vector-based data file that represents each layer of a PCB design. It is not a design file itself, but a manufacturing instruction file used by fabrication houses.

Each layer of a PCB is exported as a separate Gerber file:

• Top copper layer
• Bottom copper layer
• Solder mask layers
• Silkscreen layers
• Drill data

Why PCB Gerber File is Important

The importance of Gerber files in PCB production cannot be overstated. Manufacturers depend on them for accuracy and consistency.

Main Reasons:

• Universal compatibility across all PCB factories
• Eliminates design interpretation errors
• Ensures accurate copper etching and drilling
• Standard format for EMS production
• Reduces manufacturing cost and rework

Complete PCB Manufacturing File Set

File Type	Purpose
Gerber Files	PCB layer data
NC Drill File	Hole drilling information
BOM (Bill of Materials)	Component list
CPL / Pick & Place	Component placement data
Readme File	Instructions for fabrication

 

PCB Gerber Files Design Finalization (Before Export)

Before creating gerber files, the PCB design must be fully verified. A strong design stage reduces fabrication failures significantly.
Key checks:

• Schematic is complete and error-free
• All components are properly placed
• Routing is fully completed
• Trace width and spacing follow manufacturing rules
• No floating nets or unconnected pads

Layers Included in PCB Gerber File

Layer Type	Function
Top Copper	Signal routing
Bottom Copper	Reverse routing
Inner Layers	Multilayer PCB routing
Solder Mask	Protection layer
Silkscreen	Component marking
Drill Layer	Hole positioning

 

Step-by-Step Guide to Creating PCB Gerber Files

In this section, we’ll guide you through how to create Gerber files for PCB manufacturing using standard gerber PCB files software. Whether you’re using KiCad, Altium, or Eagle, the process is quite similar when done correctly.

1. Finalize Your PCB Design
Before generating Gerber files, we recommend making sure your design is completely ready:

• Check that all components are correctly placed
• Ensure routing (tracks) is fully completed
• Confirm there are no unconnected nets
• Run a Design Rule Check (DRC) to catch spacing or clearance issues

2. Open Your PCB Layout File
Next, open the final PCB layout in your design software:

• Launch your preferred tool (KiCad, Altium Designer, or Eagle)
• Open the PCB layout file (not the schematic)
• Make sure you’re working on the latest version

3. Access the Gerber Export Tool
This is where we define how your Gerber files will be generated.

• KiCad → File → Plot
• Altium Designer → File → Fabrication Outputs → Gerber Files
• Eagle → CAM Processor

4. Select the Required Layers
Now select all the layers needed for manufacturing: Missing any of these layers can result in incomplete or incorrect PCB fabrication.

• Top Copper
• Bottom Copper
• Inner Layers (if applicable)
• Top & Bottom Solder Mask
• Top & Bottom Silkscreen
• Board Outline / Mechanical Layer

5. Choose the Correct File Format
We always recommend using:

• RS-274X format (industry standard)
• This ensures compatibility with almost all PCB manufacturers
• It also includes necessary aperture information within the file

6. Set Units and Output Parameters
Before generating files, configure key settings:

• Use millimeters (mm) for consistency
• Set coordinate format (such as 2:5 or 4:6 precision)
• Choose absolute coordinates
• Apply correct zero suppression

7. Generate Gerber Files

• Click on “Generate” or “Plot”
• The software will export separate Gerber files for each layer
• Save them in a clearly organized folder

8. Export the Drill File
Along with Gerber files, also need to generate the drill file: This file is essential for accurate PCB assembly.

• Export the NC Drill (Excellon) file
• This includes:
  • Hole sizes
  • Drill positions
  • Via details

9. Verify the Gerber Files
Before sending your files, we strongly recommend reviewing them: This step helps you catch errors early and avoid costly rework.

• Use a Gerber viewer (online or offline)
• Check:
  • Copper trace alignment
  • Hole positioning
  • Silkscreen overlaps
  • Layer visibility

10. Prepare Files for Manufacturing
Finally, package everything for submission: A well-prepared file package ensures faster processing by PCB manufacturers or EMS providers.

• Combine:
  • Gerber files
  • Drill files
• Compress them into a .ZIP folder
• Use clear naming for easy identification

Ready to bring your PCB design to life? Generate your Gerber files today and get started with manufacturing. If you have any queries, feel free to contact our team - we’re here to help!

Common Mistakes in PCB Gerber Files

Even experienced designers sometimes face manufacturing issues due to small export errors. These are the most common problems that lead to PCB rejection:

• Missing NC drill file (critical fabrication data not included)
• Incorrect unit selection (mm vs inches mismatch)
• Incomplete or missing PCB layers
• Silkscreen overlapping solder pads
• Incorrect or missing board outline definition
• Misaligned or outdated component references

How to Fix PCB Gerber File Errors

If errors are found during review or manufacturer feedback, they can usually be corrected quickly by following a structured process:

• Re-export updated Gerber files from the PCB design software
• Use a Gerber viewer to validate every layer visually
• Cross-check drill alignment with copper layers
• Fix all Design Rule Check (DRC) violations before re-export
• Confirm corrections with your PCB manufacturer if needed

Difference Between Gerber File and PCB Design File

File Type	Purpose	Description
PCB Design File (CAD File)	Design stage	Original editable file created in software like KiCad, Altium, or Eagle. Used to design and modify the PCB layout.
Gerber File	Manufacturing stage	Final output file generated from PCB design. Used by manufacturers to fabricate PCB layers like copper, mask, and silkscreen.

 

How Manufacturers Process PCB Gerber Files

After receiving Gerber files, PCB manufacturers and EMS providers follow a structured process to convert the design into physical boards.

• CAM Engineering Review: Files are checked for errors, missing data, and manufacturability issues.
• Panelization: Multiple PCB designs are arranged into panels for efficient production.
• Copper Etching: Unwanted copper is removed to form circuit patterns.
• Drilling & Plating: Holes are drilled and plated based on NC drill data.
• Final Inspection: Finished boards are tested to ensure quality and accuracy.

PCB Manufacturing File Checklist (Final Submission Guide)

Before sending your design to a PCB manufacturer or EMS partner, always verify that your package is complete and properly structured.

• Gerber files (all required PCB layers included)
• NC Drill files (hole and via definitions)
• BOM (Bill of Materials) for component sourcing
• Pick & Place file (assembly coordinates for SMT process)
• Readme or fabrication notes (special instructions if applicable)

Frequently Asked Question

1. What is a Gerber file used for?
Ans: A Gerber file is used in PCB manufacturing to define all layer information such as copper tracks, solder mask, silkscreen, and drilling details. It acts as the main instruction file that guides PCB fabrication.

2. Which file format is used for PCB manufacturing?
Ans: The standard file format used in PCB manufacturing is the Gerber format (RS-274X). It is widely accepted by all PCB fabrication companies along with supporting files like NC drill, BOM, and Pick & Place.

3. Can Gerber files be converted to PDF?
Ans: Yes, Gerber files can be converted into PDF format using PCB viewer tools. This is mainly done for design review and checking, but PDF files are not used for actual PCB manufacturing.

4. What is the difference between a Gerber file and a PCB file?
Ans: A PCB file is the original editable design created in software like KiCad or Altium. A Gerber file is the manufacturing-ready output generated from that design and used by PCB manufacturers.

5. What software can open Gerber files?
Ans: Gerber files can be opened using tools like KiCad, Altium Viewer, Autodesk Eagle, and online Gerber viewers. These tools help verify PCB layers before sending files for manufacturing.

Conclusion

Understanding Gerber file PCB creation is essential for accurate and reliable PCB manufacturing. A correct gerber PCB design helps reduce errors, lower production costs, and improve overall efficiency.From selecting the right PCB design software to carefully validating files like a professional designer, every step directly impacts the final PCB quality. Manufacturers rely on accurate and complete file sets to ensure smooth and reliable production. Take the next step in your PCB journey with confidence generate, verify, and share your Gerber files today. If you have any questions or need assistance, our team is always here to support you click here.