How to View Gerber Files: Simple Steps for PCB Design

To view Gerber files, use a Gerber viewer software like Gerbv or online tools such as EasyEDA Gerber Viewer. These tools let you open and inspect the layers of your PCB design visually before manufacturing.

Syntax

Gerber files are a set of files with extensions like .gbr, .gtl, .gbl, representing different PCB layers. To view them, you load these files into a Gerber viewer software.

• Load Files: Open the Gerber viewer and import all related Gerber files for your PCB.
• View Layers: The viewer displays each layer such as copper, solder mask, silkscreen, and drill holes.
• Inspect: Zoom, pan, and toggle layers to check your PCB design details.

plaintext

gerber_viewer.load(['board.gtl', 'board.gbl', 'board.smt', 'board.drl'])

Output

Displays all PCB layers visually in the viewer

Example

This example shows how to open Gerber files using the free Gerbv software on your computer.

• Download and install Gerbv from its official site.
• Open Gerbv and click File > Open.
• Select all your Gerber files (e.g., .gtl, .gbl, .drl).
• The software will display the PCB layers. Use zoom and layer toggles to inspect.

bash

gerbv board.gtl board.gbl board.drl

Output

Gerbv window opens showing the PCB layers from the files

Common Pitfalls

Common mistakes when viewing Gerber files include:

• Not loading all related files, which causes incomplete PCB visualization.
• Using outdated or incompatible viewer software that cannot read newer Gerber formats.
• Confusing drill files with copper layers; drill files show holes, not copper traces.
• Ignoring layer order, which can make the PCB look wrong if layers overlap incorrectly.

Always verify you have the full set of Gerber files and use a reliable viewer.

plaintext

gerber_viewer.load(['board.gtl'])  // Wrong: only one layer loaded

// Correct:
gerber_viewer.load(['board.gtl', 'board.gbl', 'board.smt', 'board.drl'])

Output

Incomplete PCB view vs. complete PCB view

Quick Reference

Here is a quick guide to common Gerber file extensions and their meanings:

File Extension	Description
.gtl	Top copper layer
.gbl	Bottom copper layer
.gts	Top solder mask
.gbs	Bottom solder mask
.gto	Top silkscreen
.gbo	Bottom silkscreen
.drl	Drill file for holes
.gko	Keep-out layer

Key Takeaways

Use a dedicated Gerber viewer like Gerbv or online tools to open Gerber files.

Load all related Gerber files together to see the complete PCB design.

Check each layer carefully by toggling visibility and zooming in.

Avoid using outdated viewers that may not support your Gerber file format.

Understand common Gerber file extensions to identify PCB layers correctly.