Free DXF CNC File Optimizer

Analyze DXF files for CNC, laser and plasma cutting. Find splines, duplicate geometry, open contours and tiny entities before production.

Upload DXF

Drop your DXF file here or click to choose a file · processed locally in your browser

CNC Optimization

Join tolerancemm

Close gap tolerancemm

Spline tolerancemm

Maximum shape deviationmm

Smart curve fitting — use long true circular arcs where the original curve supports them

Curve smoothing tolerancemm

CNC corner safety — add radius to genuinely sharp corners

Round corners belowdegrees

Corner radiusmm

Minimum usable radiusmm

Detect duplicate entities Detect open contours Detect splines and ellipses Detect zero-length / tiny geometry

V11.1 adds Laser/Plasma output modes, sharp-corner controls and optional generic GRBL G-code. It prioritizes the original DXF shape, uses stricter global LINE/ARC fitting, and clearly shows when changed settings still need to be applied, reduces unnecessary segments, can add tangent corner radii, removes duplicates and closes only small gaps within your tolerance.

DXF Preview

Upload a DXF file to preview and analyze the geometry.

Entities—

Layers—

Splines—

Open candidates—

Duplicates—

CNC File Analysis

SPLINE entities—

ELLIPSE entities—

Duplicate entities—

Tiny / zero entities—

Potential open chains—

DXF units—

No file analyzed yet.

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Important — verify the optimized DXF before cutting

This tool automatically simplifies and repairs DXF geometry. Complex splines, very small details, tight corners or unusual entities may not always be optimized perfectly. Always open the downloaded DXF in your CAD/CAM software, inspect all contours and run a toolpath preview before laser, plasma or CNC cutting.

More DXF & CNC Resources

Useful tools, proven cutting files and project inspiration from Cut Files Shop.

Free DXF Viewer OnlineOpen and inspect DXF files directly in your browser. Best Selling DXF & SVGBrowse popular laser, plasma and CNC cutting designs. Customer CNC GallerySee real projects made from our digital cutting files. DXF & SVG BundlesLarge design collections for workshops and makers. Gate & Railing FilesDecorative DXF designs for gates, railings and metal panels.

DXF CNC Optimizer FAQ

What does the DXF optimizer do?

It analyzes DXF geometry, detects common CNC preparation issues, converts supported spline geometry into connected polyline geometry with true arc segments where possible, removes duplicates and can close very small gaps.

Should I check the file before cutting?

Yes. Always inspect the downloaded DXF in AutoCAD, CorelDRAW or your CAM software before machining. Automatic geometry optimization cannot guarantee a perfect result for every complex DXF.

Why are splines converted to polylines and arcs?

Many plasma and CNC workflows are more reliable with connected polylines and circular arcs. The optimizer attempts to preserve the original shape while reducing unnecessary points.

What does Maximum shape deviation mean?

It controls how closely the optimized geometry must follow the sampled original curve. A smaller value preserves more detail but may create more segments.

What is Corner radius?

When corner smoothing is enabled, this is the target radius used to soften eligible sharp corners. Always review small or narrow details after optimization.

Are my DXF files uploaded to a server?

The optimizer is designed to process the DXF locally in your browser. Your design does not need to be sent to our server for the geometry calculations.

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