Ranked #2 of 6

Ucamco Reference Gerber Viewer

Ucamco maintains the Gerber format specification, and this is its own online viewer. It opens Gerber X1 and X2, Excellon, XNC, NC and IPC files, shows X2 attributes and object information, and measures distances and clearances.

Last reviewed · Made by Ucamco, the developer of the Gerber format

#2

Ucamco Reference Gerber Viewer

gerber-viewer.ucamco.com ↗
Who it suits
Anyone holding a Gerber package without the design source, especially buyers and fab-side engineers who need to know exactly what the data says.
Cost
Free. Ucamco describes it as freeware.
Place by situation
With the design source: not listed (doesn't open source files) · Gerbers only: #1

Strengths

  • Made by the developer of the Gerber format, as the reference for how a file should be drawn.
  • Opens Gerber X1 and X2, Excellon, XNC, NC and IPC files.
  • Shows X2 attributes and the information attached to each object.
  • Measures distances and clearances.
  • Has included a formal syntax checker since 2022, so it can flag files that break the specification.

What it can't do

  • Cannot open design source files: no schematic, no parts list, no design intent.
  • Files go to Ucamco's web service. Read its terms before uploading a confidential design.
  • It shows what the data says, not whether that is what you meant: a missing layer or wrong outline still needs your eye.

VerdictThe best pure Gerber viewer here: when the Gerbers are all you have, start with it.

Ucamco Reference Gerber Viewer against each criterion, with sources →

Ucamco Reference Gerber Viewer on each criterion

CriterionMarkWhat we found
File supportYesGerber X1 and X2, Excellon, XNC, NC and IPC files.
Layer accuracyYesMulti-layer, from the developer of the format; shows X2 attributes.
Drill and outline handlingYesExcellon, XNC and NC drill files open with the layers.
Privacy of uploadsPartlyFiles are uploaded to Ucamco over HTTPS; Ucamco states it offers robust privacy and security. Not processed only in your browser.
Measuring toolsYesMeasures distances and clearances; shows object information.
Source files as wellNoManufacturing data only.

Where to check this

Something changed? Send a correction with a link we can check.