Free online DXF to PAT converter

DXF can identify two different source types: a graphics drawing-exchange file or an Autodesk CAD drawing. This page accepts both and converts their usable line geometry into a PAT hatch-pattern file for software that supports PAT definitions.

How to tell which DXF file you have

The creating program is the most reliable identifier. A Graphics DXF usually comes from vector-illustration, sign-making, embroidery, or cutting software and contains paths, curves, text, and artwork. A CAD DXF usually comes from AutoCAD, BricsCAD, DraftSight, QCAD, LibreCAD, or another engineering application and contains layers, blocks, dimensions, polylines, and model-space coordinates.

Inspecting the file can also help, although the two types may use similar exchange syntax. An ASCII DXF opens as readable text and commonly contains sections such as SECTION, HEADER, TABLES, and ENTITIES. A binary DXF does not. The header may contain an $ACADVER value identifying the DXF version. Graphics exports often omit CAD tables and engineering metadata, while CAD drawings commonly include layers, blocks, dimensions, units, and extensive entity data.

Graphics drawing exchange format

A graphics-category DXF is a vector drawing-exchange file used to move scalable artwork between illustration, sign-production, cutting, plotting, and fabrication programs. Its geometry can include lines, arcs, Bézier-derived curves, polylines, text, and closed paths; unlike a bitmap, it stores shapes rather than pixels.

PAT is a text-based hatch-pattern format, commonly accepted by AutoCAD-compatible CAD programs. A PAT definition describes repeated line families with angles, origins, spacing offsets, and optional dash sequences; it does not preserve general artwork, colors, text, gradients, or bitmap content.

Before conversion, remove text, fills, effects, open paths, duplicate lines, and unrelated artwork. Convert curves to line or polyline geometry where the destination pattern requires it, isolate one repeatable motif, check the drawing units, and make sure the motif tiles without gaps. Then upload the cleaned DXF to 101convert.com, choose PAT as the output, start the conversion, and download the resulting .pat file without installing software.

A logo or illustration that is not a repeating line motif may produce a valid but visually incomplete PAT. For greater control, clean the file in a DXF-capable graphics or CAD program, reduce the motif to straight-line geometry, and use a PAT pattern editor or script that supports the target application.

Autodesk drawing exchange format

Autodesk’s Drawing Exchange Format is a CAD interchange format for transferring two-dimensional and three-dimensional design data between AutoCAD-family products and other CAD systems. It can contain points, lines, arcs, circles, polylines, splines, solids, layers, blocks, dimensions, annotations, and explicit coordinates with drawing units.

To prepare a CAD DXF, keep only the linework intended for the hatch, preferably one closed repeat cell or the lines that define it. Delete construction geometry, dimensions, title blocks, annotations, unrelated layers, blocks, and 3D entities. Flatten the remaining geometry to a 2D plane, position its origin predictably, remove duplicate or extremely short segments, and verify the intended scale and units.

Use AutoCAD, BricsCAD, DraftSight, QCAD, or LibreCAD to inspect and simplify the drawing, then upload the cleaned DXF to 101convert.com, select PAT, convert it, and save the output. These CAD programs can prepare the source accurately, but arbitrary CAD geometry does not automatically become a useful PAT unless it can be represented as repeating hatch lines.

Quality and compatibility limits

PAT is not a general replacement for DXF. It normally represents repeated straight hatch strokes, so curves, splines, filled regions, 3D objects, colors, layers, lineweights, blocks, dimensions, and annotations may be discarded or approximated. A syntactically valid PAT can therefore differ substantially from the original drawing.

PAT syntax and supported limits vary between AutoCAD-compatible applications. Test the file in the destination program and adjust pattern scale, rotation, origin, line spacing, or dash lengths if necessary. Use the expected .pat extension, avoid a duplicate pattern name, and retain the original DXF because the conversion is generally lossy and not reversible.