DXF vs SVG for Laser Cutting: Which File Format Should You Use?

If you've designed a part you want laser cut, you've probably run into the question of file format. Two of the most common vector formats are DXF and SVG — both store shapes as mathematical curves rather than pixels, so at first glance they seem interchangeable. They're not. For professional laser cutting of sheet metal in South Africa, the format you choose has a direct impact on whether your parts come out the right size, with clean geometry, and without costly cut errors.

This guide explains exactly what each format does, why they differ, and which one to use when — so you can upload with confidence and get your parts right the first time.

What Is a DXF File?

DXF stands for Drawing Exchange Format. It was developed by Autodesk in 1982 as a way to share CAD drawings between different software packages, and it has been the engineering industry's standard interchange format ever since. Virtually every CNC machine, laser cutter control system, and professional CAM package can read DXF natively.

The key property of a DXF file is that its geometry is stored in real-world units — typically millimetres or inches. When you draw a 50 mm circle in your CAD package and export as DXF, that circle will be exactly 50 mm when it arrives at the laser cutter, regardless of what screen size or zoom level it's viewed at.

DXF files can contain lines, arcs, polylines, splines, circles and ellipses — all the geometry types relevant to laser cutting. They can also contain layers, which professional operators use to separate cut lines from etch lines or fold indicators.

What Is an SVG File?

SVG stands for Scalable Vector Graphics. It's an open web standard developed by the W3C, designed to display vector graphics in browsers and digital interfaces. Unlike DXF, SVG was built for screens, not for manufacturing.

SVG files store coordinates in pixels (or occasionally percentages and other relative units), not millimetres. This creates an immediate problem for manufacturing: a pixel has no fixed physical size. The same SVG file might display as a 100 mm shape on one monitor and a 60 mm shape on another, depending on the screen's DPI setting. When you import an SVG into a laser cutter's control software, the machine has to guess at a scale — and it will frequently guess wrong.

SVG files are also commonly used for decorative design work — logos, illustrations, artwork — where geometric precision at a sub-millimetre level isn't critical. As a result, many SVG files contain open paths, duplicate lines, overlapping geometry and other artefacts that cause problems when the laser tries to follow them as cutting paths.

DXF vs SVG: A Direct Comparison

Property	DXF	SVG
Units	Real-world (mm / inches)	Pixels (screen-relative)
Precision	High — 15+ decimal places	Lower — designed for display
Industry standard for CNC	Yes	No
Accepted by fibre laser services	Yes — universally	Rarely
Accepted by CO₂ hobby cutters	Yes	Sometimes
Scale-safe for manufacturing	Yes	No — scale must be manually set
Supports layers	Yes	Limited
Common creation tools	Fusion 360, SolidWorks, AutoCAD, FreeCAD	Inkscape, Illustrator, Figma, browsers
Typical use case	Engineering, CNC, sheet metal	Web design, icons, print artwork

Why DXF Is the Standard for Laser Cutting Sheet Metal

Professional laser cutting services — including QuickCut — operate fibre lasers that cut mild steel, stainless steel and aluminium to tight dimensional tolerances. These machines are controlled by industrial CAM software (such as Hypertherm ProNest, Bystronic BySoft, or Trumpf TruTops) that is built around DXF as its native input format.

When you upload a DXF to QuickCut's instant quoting engine, the system reads the geometry in millimetres, calculates the total cut length, identifies any nested islands, and computes an accurate price — all automatically. There is no ambiguity about scale, because DXF doesn't have scale ambiguity.

If you were to upload an SVG, the system would need to interpret pixels as millimetres, which requires a conversion factor of 3.7795 px/mm (based on 96 dpi). Even if that conversion is applied correctly, any SVG that was created at a different DPI setting — or whose viewBox doesn't match the artboard — will produce parts that are the wrong size. For a 50 mm bracket, a 1% scale error is 0.5 mm. For a precision part that needs to fit inside a housing, that's the difference between a part that fits and one that doesn't.

When SVG Is Used in Laser Cutting (and Why It's Limited)

SVG files are more widely accepted by hobby-grade CO₂ laser cutters used for cutting wood, acrylic, leather and cardboard — materials where a millimetre of error is rarely critical. Machines like the xTool, Glowforge, and Atomstack series have built-in SVG importers and are popular with makers who design in Inkscape or Illustrator.

For these use cases, SVG works reasonably well because the operator manually sets the material bed size and the machine scales the file to fit. If the result is slightly off, iterating on a piece of cardboard costs almost nothing. That workflow doesn't translate to industrial sheet metal, where you're cutting R500 worth of 3 mm mild steel on a single sheet — getting it wrong once is expensive.

Even for hobby use, common SVG problems include:

• Open paths — a shape that looks closed on screen but has a small gap. The laser follows the path and leaves an uncut section.
• Duplicate lines — when the same edge is drawn twice. The laser cuts it twice, widening the kerf and potentially distorting the part.
• Text converted to paths incorrectly — letters that look right but have internal islands that disconnect.
• Embedded raster images — SVG files can contain PNG images. A raster image has no cuttable geometry.

How to Convert SVG to DXF for Laser Cutting

If your workflow produces SVG files — for example, you're designing in Inkscape, Illustrator, or Figma — you can convert to DXF. The conversion is not always lossless, so follow these steps carefully:

1. Set your document units to millimetres. In Inkscape, go to File › Document Properties and change the display units to mm. Set the page size to match your intended part dimensions.
2. Verify your dimensions. Draw a reference rectangle of a known size (e.g. 100 mm × 50 mm) and check it measures correctly on screen at 100% zoom. If it doesn't, your scale is wrong and any export will be off.
3. Close all open paths. Select all paths and use Path › Break Apart, then Path › Union or manually close gaps. Zoom in to 500% or more to spot small gaps at path endpoints.
4. Remove duplicates. Select all and use Edit › Find/Replace or a cleanup extension to detect overlapping lines.
5. Export as DXF. File › Save As › Desktop Cutting Plotter (R14) (.dxf). In the export dialog, ensure the base unit is set to mm, not px.
6. Verify in a DXF viewer. Open the exported DXF in a free viewer (DWG FastView, LibreCAD, or the DXF viewer at quickcut.co.za) to confirm dimensions and check for artefacts before uploading.

DXF from CAD: The Preferred Approach

If you're designing a functional part — a bracket, an enclosure panel, a structural component — the best approach is to draw it directly in a CAD package that outputs DXF natively. This eliminates the SVG conversion step entirely and gives you a cleaner file with fewer potential problems.

Recommended tools for DXF creation

Fusion 360 (free for personal use and startups) is arguably the most accessible professional CAD tool available today. Sketch your 2D profile, apply dimensions in mm, and export the sketch as DXF. Fusion guarantees millimetre accuracy and handles arc-to-polyline conversion correctly.

SolidWorks is the industry standard in South African engineering firms. Create a 2D sketch or a flat pattern from a sheet metal part, right-click the face, and export as DXF. SolidWorks DXF exports are extremely clean and reliable.

AutoCAD and AutoCAD LT are obvious choices if you already use them. Draw in model space with units set to mm and save as DXF directly — no export step needed.

FreeCAD is a free, open-source option with a dedicated TechDraw module for 2D output and a Part Design workbench for 3D modelling. DXF export is built in.

Inkscape is perfectly usable for flat 2D profiles — logos, decorative panels, signage — as long as you follow the unit and path-cleaning steps above. It is not ideal for dimensionally precise engineering parts.

For more detail on the export process from each of these tools, see our full guide to preparing your DXF file for laser cutting, which covers the exact export settings for Fusion 360, SolidWorks, AutoCAD and Inkscape.

What QuickCut Requires

QuickCut's instant online quoting system accepts DXF files only. When you upload your DXF at quickcut.co.za, the system automatically:

• Parses the geometry and calculates total cut length
• Detects the bounding box to determine sheet usage
• Identifies open contours and warns you before you pay
• Generates an instant price in ZAR based on material, thickness and cut complexity

This all happens in seconds, with no human in the loop. It's only possible because DXF files provide unambiguous geometry and real-world dimensions. An SVG file would require manual intervention to confirm scale and clean up paths — which is exactly the kind of back-and-forth that QuickCut's instant system is designed to eliminate.

There are no minimum orders, so if you want to test a single prototype part, you can upload one DXF, get an instant price, pay online, and have the part cut and shipped anywhere in South Africa — all without speaking to anyone. See our overview of how online laser cutting works in South Africa for the full picture.

Quick Reference: Which Format to Use

Your situation	Use this format
Precision engineering part (bracket, panel, enclosure)	DXF — from Fusion 360, SolidWorks, or AutoCAD
Decorative cut (signage, artwork, decorative panel)	DXF — convert from Inkscape SVG using mm units
Ordering from QuickCut	DXF — required for instant quoting
Hobby CO₂ cutter (wood/acrylic) at home	SVG acceptable, but DXF is still better practice
Web or print graphic, not being cut	SVG — its intended use case

Frequently Asked Questions