Convert GTL to PHO

Understanding GTL and PHO file formats

GTL files are Gerber files used in PCB (Printed Circuit Board) design, specifically representing the top copper layer of a PCB. These files are essential for manufacturing and are generated by PCB design software.

PHO files are also Gerber files, but the extension .pho is commonly used to denote photoplotter files for PCB fabrication. In many cases, PHO files are simply Gerber files with a different extension, often used for compatibility with specific manufacturing equipment or workflows.

How to convert GTL to PHO

Since both GTL and PHO are Gerber format files, conversion typically involves renaming the file extension from .gtl to .pho. However, some PCB manufacturers may require specific formatting or settings within the Gerber file. It is important to verify the requirements with your manufacturer.

Best software for GTL to PHO conversion

The most reliable way to convert and verify Gerber files is by using PCB design or Gerber viewing software. Here are the recommended tools:

• Gerbv (free, open-source): Open your .gtl file, then use File → Save As and change the extension to .pho.
• Altium Designer: Import your PCB project, then use File → Fabrication Outputs → Gerber Files and specify the output extension as .pho.
• KiCad: In the plot dialog, set the output file extension to .pho when exporting Gerber files.

For simple cases, you can also manually rename the file extension from .gtl to .pho if no special formatting is required.

Tips for successful conversion

• Always verify the converted PHO file with a Gerber viewer to ensure data integrity.
• Consult your PCB manufacturer for specific file naming or formatting requirements.
• Keep a backup of the original GTL file before conversion.