Preparing an SVG or DXF File for Laser Cutting
By the PandaFile team · · 6 min read
A file that opens fine on screen can cause problems once it's sent to the laser: duplicate lines, unclosed paths, wrong scale. Better to check it before starting the cut. This article complements the fabrication file organization guide and the formats guide.
SVG or DXF: which one to choose?
Both work with most laser software. In short:
- SVG: ideal for vector drawing and illustrations, widely produced by Illustrator/Inkscape.
- DXF: technical standard (CAD, CNC), precise on dimensions and units, often supplied by plan providers.
- In practice: keep the original format and convert only if your software requires it.
The 3 problems that ruin a cut
1. Open paths. A path that looks closed but isn't prevents a clean cut. 2. Duplicates. Two overlapping lines = the laser passes twice over the same spot. 3. Units. A DXF in inches imported as millimeters, and your part comes out the wrong size.
Check before cutting
The ideal is to see the file before opening it in the machine software. An accurate preview of the SVG or DXF already shows you whether it matches the right project and the right version. For technical DXFs, a dedicated tool like DXFFile analyzes and repairs open paths, duplicates, and units before production.
Once the file is validated, store it with its peers: see organizing your laser cutting files and keep the right setting per material.
In short
A reliable laser file is one whose content you know (preview), whose geometry you know (closed paths, no duplicates), and whose scale you know (correct units). Taking ten seconds to check saves you from wasting a sheet of material.
Frequently asked questions
Is an SVG or a DXF better for laser cutting?
Both work. SVG is more common for vector drawing and illustration; DXF is more precise on dimensions and units, which makes it the standard for technical plans. Keep the original format as long as your software accepts it.
Why does my part come out the wrong size?
Most often because of units: a file in inches interpreted as millimeters (or the reverse). Check the DXF's unit before importing and compare a known dimension.
How do you spot open paths or duplicates?
Some laser software flags them, but a dedicated analysis tool like DXFFile detects and fixes them automatically before cutting, which prevents double passes and incomplete paths.
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