Open the package
Choose a ZIP or select the Gerber and drill files together. You can also try the demo board to explore the controls before opening your own design.
Free PCB production tool
Online Gerber Viewer
Inspect PCB production files before they reach a factory. Preview both sides, isolate layers and catch incomplete packages—without uploading your design to a server.
Files stay on your device No account required
Drop your production files here.
Upload a ZIP package or select Gerber, Gerber X2 and Excellon files together.
Up to 30 MB per file · Maximum 60 production filesThree steps to a clearer PCB package
Use the preview to organise your manufacturing files before the engineering review.
Inspect the layers
Switch between top and bottom views, isolate layers and check their type and side. Use the visible controls to fit, zoom, pan or measure the preview.
Review and share
Read the pre-check results and compare them with your source design. Export a preview or add a board summary to a manufacturing enquiry.
What to look for in the preview
A visual check can help you spot a missing layer, a misplaced drill file or the wrong board revision. Inspect each layer in context rather than relying only on the combined image.
The displayed measurements and checks are preview aids. Confirm dimensions against the source CAD data and have your fabricator review its own manufacturing rules.
- Board outline and size
- Look for the intended perimeter and cutouts. Compare the detected dimensions with the drawing, especially if the package includes panel features or multiple outlines.
- Copper, mask and silkscreen
- Check that the right layers appear on each side and that visible openings and markings match the design. Isolating a layer makes overlaps easier to inspect.
- Drill alignment
- Compare holes with pads, mounting positions and the outline. Check the detected drill tools and confirm plated or non-plated information in your fabrication package.
- Unknown or missing files
- Review classifications, correct the type or side where needed, and confirm that the export contains all intended manufacturing layers.
Visual review before manufacturing review
The viewer reads production files locally and helps you explore their geometry. It does not validate the electrical design or know a manufacturer’s process capability.
A complete DFM review also considers requirements such as trace and spacing limits, annular rings, copper-to-edge clearance, materials and drill capability. Assembly needs a BOM, placement information and a test plan as well as board layers.
Explore PCB assembly and engineering review →Start with your next PCB decision
Practical guides and editable checklists for preparing files, reviewing a prototype and planning assembly.
Check your manufacturing files
Export a consistent package, investigate preview problems and inspect the layers.
Prepare an assembly quote
Build a controlled BOM and define the scope of a small production batch.
Gerber Viewer FAQs
How do zooming and panning work?
Use the zoom buttons or hold Ctrl on Windows, or Command on macOS, while scrolling over the board. Normal wheel scrolling moves the page. Drag to pan and use Fit to bring the board back into view. The viewer also displays its keyboard guide.
What are the file size limits?
The viewer accepts up to 30 MB per file and a maximum of 60 production files. Extracted files are limited to 60 MB in total. Remove unrelated documents and duplicate exports if a package exceeds the limits.
Can I save a preview or a report?
After loading a board, use PNG or SVG to export a visual preview, or Download report for a text summary of detected layers and checks. These outputs help communicate a review; they do not replace the original manufacturing files.
Are my Gerber files uploaded to PCBPit?
No. The viewer reads and renders the selected files inside your browser. Your design data is not sent to our server.
Which PCB files can I open?
The viewer supports common Gerber and Gerber X2 layer files, Excellon drill files and ZIP packages containing those production files.
Can this viewer replace a fabrication DFM check?
No. It helps you visually confirm layers, orientation, board dimensions and obvious missing files. A manufacturer DFM review also checks process-specific rules such as annular rings, copper-to-edge clearance and drill capability.
Why is a layer classified as unknown?
Legacy and custom file extensions do not always describe their purpose. Use the layer’s type and side controls to correct its classification, and compare it with your source design. Gerber X2 attributes or standard filenames can make future exports easier to identify.
Can I use the preview for a PCB quote?
Yes. After checking the package, select Get manufacturing quote to add a board summary to the enquiry form. Design files are not attached automatically; add the original manufacturing files in the form before submitting.
Ready to discuss the build?
Send your quantities, requirements and approved manufacturing package to the PCBPit team.