DXF Won't Import into LightBurn — How to Fix It
LightBurn supports DXF import, but certain DXF features cause failures: unsupported entity types, spline curves that LightBurn cannot convert, block references, or DXF versions above R14. Each cause has a specific fix.
Steps
- 1
Try importing the DXF into Inkscape first — if Inkscape opens it, the file structure is valid
- 2
In Inkscape, select all (Ctrl+A) and convert to paths: Path > Object to Path
- 3
Remove any elements that are not paths: text, dimensions, hatches, blocks
- 4
Export as DXF R14 from Inkscape: File > Save As > Desktop Cutting Plotter (DXF R14)
- 5
Import the re-exported DXF into LightBurn
- 6
If splines cause issues: in Inkscape, select spline paths, apply Path > Flatten Beziers extension to convert to polylines
About DXF won't import into LightBurn
LightBurn's DXF importer handles most DXF files but fails on specific entity types and DXF versions. Here is how to diagnose and fix each cause.
Cause 1 — DXF version too high: LightBurn imports DXF R14 and earlier reliably. DXF 2013, 2018, and later versions (AutoCAD-generated) may contain entities LightBurn does not recognise. Re-export from Inkscape as DXF R14 to resolve this.
Cause 2 — Unsupported entity types: LightBurn does not import DXF SPLINE entities, BLOCK/INSERT references, HATCH fills, DIM (dimensions), or TEXT. Open the DXF in Inkscape or a CAD viewer and remove these entities. Convert splines to polylines or Bézier curves before re-exporting.
Cause 3 — Non-path objects: if the DXF contains circles, ellipses, rectangles, or arcs as separate DXF entities (not paths), LightBurn may import them incorrectly. In Inkscape, use Path > Object to Path on all elements to convert them to path entities before DXF export.
Cause 4 — File encoding issues: some DXF files use non-standard encoding. Open in a text editor and check that the file starts with the string '0\nSECTION'. If it contains binary header data, it is a DXF variant that requires conversion in AutoCAD or DraftSight.
Cause 5 — Units mismatch: if the DXF imports at the wrong scale in LightBurn, the document units in the original file did not match LightBurn's expected units. Check File > Settings > DXF Import Units in LightBurn and match to the units used in the source file.
Alternative: bypass DXF entirely and use SVG. LightBurn's SVG importer is more robust than its DXF importer. Export SVG from Inkscape and import into LightBurn instead.