How to Open .PCB and .BRD Files Online

A file ending in .brd or .pcb is often an editable PCB design database created by an electronic design automation tool. It is not automatically a Gerber file, and the extension alone does not identify one universal format. Several unrelated applications have used these short extensions over the years.

This site is a Gerber and Excellon viewer. It does notdirectly open native EDA .brd or .pcb design files. The correct workflow is to open the design in the application that understands it, export the PCB manufacturing files, and then load the resulting Gerber and drill package here.

That distinction matters because a native board file can contain nets, footprints, design rules, layer-stack settings, component data, and editing information. A Gerber export contains rendered manufacturing artwork for individual layers. Learn more in what a Gerber file is.

Why .BRD and .PCB are not one file format

An extension is only part of a filename. .brd is strongly associated with Autodesk EAGLE board designs, including text-based XML in later EAGLE generations and older binary variants. But other PCB and layout products have also used .brd, so an EAGLE label is not guaranteed merely by the extension.

.pcb is even more generic. Different PCB editors have used it for their own native or legacy board formats, and those formats are not necessarily compatible with each other. Modern KiCad board files, for example, normally use .kicad_pcb, while files from older or other applications may use .pcb or .brd for something structurally different.

Before choosing software, ask who created the file and in which tool and version. Companion schematic, library, project, or backup filenames may provide clues. A text editor can sometimes reveal a readable header, but do not edit or resave an unfamiliar board file as a conversion method. Preserve an untouched copy of the source.

The correct path: export Gerber first

1. Identify the EDA application and, when relevant, the version that created the .brd or .pcb file.
2. Open the complete project in that tool or a documented compatible importer. Include linked libraries or project data when the design depends on them.
3. Inspect the board before export. Confirm the outline, layer stack, copper, components, design rules, and latest revision.
4. Use the tool's fabrication, CAM, plot, or manufacturing export to generate Gerber layers. Export top and bottom copper, all inner copper layers, solder mask, silkscreen, paste when needed, and the actual board profile.
5. Export matching Excellon drill data, including plated and non-plated holes according to the EDA tool and manufacturer workflow. Keep drill units and coordinate settings explicit.
6. Put the outputs from this one revision into a clean folder or ZIP, without stale files from earlier exports.
7. Open the exported package in the online Gerber viewer and verify layer alignment, drill positions, outline, scale, and completeness.

Export commands differ by application. For an EAGLE board, follow the EAGLE Gerber export guide. For projects that can be opened and validated in other tools, use the matching KiCad export guide or Altium Designer export guide. Only use a tool after confirming that it interpreted the native design correctly.

Why renaming the extension does not work

A native PCB file and a Gerber file have different internal structures and purposes. Changing project.brd to project.gbr changes no data. A Gerber parser will still see an unsupported native design database rather than valid Gerber commands.

Generic file-conversion websites can also be risky for this job. A valid manufacturing export requires choices about layers, board profile, apertures, drill files, units, format, and sometimes plated-hole intent. A converter that merely produces a viewable image or silently omits data has not created a trustworthy fabrication package.

The source EDA software—or a verified compatible importer followed by a careful design review—has the context needed to create the outputs. If you cannot identify or open the native format, ask the sender to export Gerber and Excellon files rather than guessing.

What is preserved after conversion to Gerber?

Gerber preserves the graphical manufacturing result for each exported layer: flashes, draws, regions, and attributes where used. Excellon carries the drill coordinates and tool information. Together they let a CAM viewer reconstruct the physical layer artwork and hole pattern for inspection and fabrication workflows.

They do not preserve the full editable design model. Do not expect to recover schematic connectivity, component properties, interactive routing constraints, design-rule definitions, or library relationships from ordinary Gerber outputs. Keep the original .brd, .pcb, and companion project files under versioned backup.

Check the exported package before using it

• Load all Gerber layers and drill files together, preferably from the clean export ZIP.
• Confirm top, bottom, and every required inner copper layer is present.
• Verify solder mask, silkscreen, paste, and outline data against the source design.
• Check that drill holes and slots align with pads, vias, mounting features, and cutouts.
• Look for wrong scale, offset layers, mirrored content, missing board edges, or a mixture of old and new revision files.

The Gerber opening guide explains the inspection workflow in more detail. Once the native board has been exported correctly, you can use this site to view the Gerber and Excellon package for free—without claiming that the original .brd or .pcb was opened directly.

FAQ

Can this Gerber viewer open an EAGLE .brd file directly?

No. An EAGLE .brd file is an editable EDA design file, not a Gerber manufacturing file. Open it in a compatible EDA tool, export Gerber and Excellon drill files, then load those outputs into this viewer.

What program opens a .brd file?

It depends on which application created it. Autodesk EAGLE and compatible Fusion electronics workflows use .brd, but other products have also used that extension for unrelated formats. Identify the source tool before opening or converting the file.

What program opens a .pcb file?

The .pcb extension is shared by several PCB design formats, so there is no universal opener. Use the filename context, companion project files, file header, or sender information to identify the originating EDA application.

Can I rename .brd or .pcb to .gbr?

No. Renaming only changes the filename; it does not convert an editable PCB database into Gerber image data. Use the source EDA tool’s fabrication or CAM export.

Does exporting Gerber preserve the editable PCB design?

No. Gerber preserves manufacturing layer artwork, not the full schematic, design rules, component intelligence, net relationships, or editing history. Keep the original project files as the design source.