Free online GBR to DXF converter

PCB fabrication data may need to enter a mechanical CAD, laser-cutting, or CNC workflow that accepts DXF rather than Gerber. Converting a Gerber layer provides editable drawing geometry, but it does not reconstruct the complete PCB design or fabrication package.

What the GBR format is

In the CAD and electronics-manufacturing context, .gbr is a Gerber file containing artwork for one printed-circuit-board layer. A file may represent copper, solder mask, silkscreen, solder paste, or the board outline. Gerber RS-274X and X2 data describe coordinates, lines, arcs, flashes, regions, apertures, and image polarity; X2 can also include layer attributes.

PCB applications such as KiCad, Altium Designer, Autodesk Fusion Electronics, Autodesk EAGLE, and EasyEDA export Gerber files for manufacturing. One board normally produces several files, such as F_Cu.gbr, B_Cu.gbr, F_Mask.gbr, and Edge_Cuts.gbr. Plated and non-plated hole data is normally supplied separately as an Excellon file, commonly using .drl or .xln.

Gerber is flattened manufacturing artwork rather than an editable PCB project. It generally does not contain component relationships, net names, schematic links, design rules, or the complete layer stack. Older RS-274D files may also require a separate aperture file; RS-274X normally embeds its aperture definitions.

What the DXF format is

DXF, or Drawing Exchange Format, is Autodesk's interchange format for CAD drawings. CAD and CAM programs including AutoCAD, DraftSight, BricsCAD, QCAD, LibreCAD, and many laser-cutting and CNC applications can import it.

A DXF drawing can contain selectable lines, arcs, circles, polylines, regions, layers, blocks, and other entities. This makes converted Gerber artwork easier to measure, combine with mechanical drawings, edit, and send to equipment that does not read Gerber.

Gerber concepts do not map directly to ordinary DXF geometry. The conversion may discard or flatten aperture definitions, polarity, thermal reliefs, layer-specific manufacturing meaning, filled-region behavior, and connectivity. The result is generally a 2D geometry file, not a replacement for the PCB source project.

How to convert a Gerber layer to DXF

For a quick conversion without installing software, use the converter on 101convert.com. It is suitable for a single, non-confidential layer:

1. Open the GBR-to-DXF converter on 101convert.com.
2. Select the required Gerber file, such as Edge_Cuts.gbr for the board outline or F_Cu.gbr for top copper.
3. Choose DXF as the output format and start the conversion.
4. Download the result and open it in a CAD program or viewer. Measure a known board dimension before editing or manufacturing.

Convert each required Gerber file separately unless the converter explicitly supports a Gerber archive or multiple layers. Assign the resulting drawings to corresponding CAD layers. Convert or import the Excellon drill file separately; a single GBR file does not contain the complete hole pattern.

For local processing and more inspection control, use FlatCAM:

1. Open FlatCAM and choose File → Open Gerber, then load the required .gbr file.
2. Confirm the detected units, coordinate origin, extents, and polarity. If the source is an older RS-274D file, provide its matching aperture file when requested.
3. Compare the rendered object with the original Gerber in a trusted Gerber viewer. Check the board dimensions, flashes, tracks, filled regions, and cutouts.
4. Select the imported Gerber object and use its DXF export command. Depending on the FlatCAM release, this may appear under File → Export → DXF or in the object's context menu.
5. Save a descriptive file such as board-outline.dxf or top-copper.dxf, then open it in the destination CAD or CAM program.

Use the outline Gerber for a board-perimeter drawing, not a copper layer. For a complete CAD reference, repeat the process for the needed copper, mask, paste, silkscreen, and outline layers, then align them using their common origin.

If the original PCB project is available, export the outline or geometry directly from that project or its associated CAD tool. Source-project geometry preserves design intent and editability that Gerber output has already flattened.

Quality and compatibility limits

• Verify scale. Gerber data may use inches or millimeters. A unit mismatch scales the result by 25.4 or its inverse. Measure the board width, a mounting-hole spacing, or another known dimension in the DXF.
• Check polarity and cutouts. Negative Gerber layers and clearances may become inverted outlines, separate boundaries, or incorrect filled regions. Inspect copper pours, holes, thermals, and mask openings against the source Gerber.
• Some exporters convert curves and regions into thousands of short line segments. This can enlarge the file and make trimming, offsetting, or CNC toolpath generation unreliable; use clean arcs or closed polylines when the receiving system requires them.
• Coordinate origins and axis directions can differ between PCB and CAD software. Confirm alignment with the original layer before combining multiple DXF files.
• DXF does not normally retain Gerber layer meaning, electrical connectivity, drill attributes, or fabrication rules. Do not use a converted DXF as the sole manufacturing source without checking all required Gerber layers and the Excellon drill data.
• If the destination requires a particular DXF revision, resave to that revision, such as R12 when supported, and confirm whether it expects model-space geometry, closed polylines, or specific layer names.