Ucamco, custodian of the Gerber format, offers a free Reference Gerber Viewer to the Gerber community. The link is
https://gerber.ucamco.com/
It is a cloud-based online web service. There is no software to download, install and maintain. It is always up-to-date.
On the Downloads page (
https://www.ucamco.com/en/file-formats/gerber/downloads) you can also find the latest version of the Gerber File Format Specification.
New features added in version 2.1
- Support for drill files in NC or Excellon format, which is ubiquitous in fabrication data.
Fabrication data with drill files in NC format can now be viewed.
- Support for Gerber X2 attributes.
With fabrication data in X2 format the layer structure is displayed, and file and attribute functions can be queried.
It is now identified which file is e.g. the top copper, or the bottom legend. From all objects one can not only check the aperture size,
but also their function, e.g. whether they are a component or a via pad – vital information for fabrication.
Feedback is always welcome via
gerber@ucamco.com