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// Technique

Preparing designs for a laser: vectors, rasters and kerf

How laser software decides what to cut, score and engrave — and how to set up files so jobs come out right first time on any machine, from a Glowforge to an open-frame diode.

Updated 4 October 2026

Three kinds of operation

Almost every laser — whatever the brand — does three things:

OperationWhat the laser doesTypical use
CutFollows a vector path with enough energy to go right throughShapes, box panels, jewellery blanks
Score (or line engrave)Follows a vector path lightly, marking the surfaceFold lines, outlines, fine line art
Engrave (raster)Scans back and forth, filling an area line by lineText fills, photos, shaded artwork

Your software assigns an operation to each part of the design — usually by colour or layer — and each operation has its own power, speed and passes.

Vector or raster?

  • Vector artwork (SVG, DXF, PDF, AI) is made of paths. Lasers can cut, score or fill-engrave it. Keep paths closed and remove duplicates — overlapping lines get cut twice and burn more.
  • Raster images (PNG, JPG) are made of pixels and can only be engraved. Use a high enough resolution for the size you engrave; photos usually need dithering.

Set up your file

  1. Work at real size in millimetres. Check your design software exports at 1:1.
  2. Convert text to paths (outlines) so it doesn’t change if the font is missing on another computer.
  3. Use colours or layers for operations — for example, red for cut, blue for score, black for engrave.
  4. Order matters: engrave and score first, cut last, so parts don’t move or drop before the marking is finished.
  5. Inside before outside: cut holes and inner shapes before the outer outline.

Allow for kerf

The beam removes a thin strip of material — the kerf. For decorative work you can ignore it. For anything that must fit together — slots, tabs, inlays, finger joints — measure it on a test cut and offset your paths by half the kerf, or use your software’s kerf-offset setting.

Nest to save material

Arrange parts close together, share common edges where you can, and leave a small margin from the sheet edge. Some software nests automatically.

Before you press start

  • Is the material one you’ve identified as laser-safe? Check our materials guide.
  • Is the machine focused for this thickness?
  • Is extraction running, and are you staying with the job? See our safety guide.