Guide · November 8, 2026
Laser Etching vs Engraving vs Marking: What's the Difference?
Engraving, etching and marking are often used as if they mean the same thing. Here is what each actually does to the material and which one a diode laser does on each surface.
You will see “laser engraving”, “laser etching” and “laser marking” used interchangeably in product listings. In practice they describe three different things that happen to the material. Knowing the difference helps you pick the right settings, and the right machine.
The three terms
| Process | What happens | Depth | Typical materials |
|---|---|---|---|
| Engraving | Material is vaporized and removed | Visible depth | Wood, leather, acrylic, slate |
| Etching | Surface melts and re-solidifies with a changed texture | Very shallow | Metals, some plastics |
| Marking | Colour or contrast changes, little or nothing is removed | None or almost none | Anodized aluminium, coated metals, marking sprays |
Engraving
The beam heats the material until it vaporizes, leaving a cavity. Deep engraving takes multiple passes. Wood also darkens at the edges of the cut, which gives it contrast. This is what most diode laser work on wood, leather and acrylic is.
Etching
The term comes from metalworking. The laser melts a thin surface layer, which cools with a slightly raised or rough texture that reflects light differently. It’s mostly a fiber laser process on bare metal. Glass “etching” with a laser is really surface micro-fracturing, which looks frosted.
Marking
The material changes colour without meaningful removal. On anodized aluminium, the laser removes a very thin dyed layer. With marking spray, a coating bonds to the surface. Fiber lasers can also anneal steel, changing its colour by heating it without removing anything.
What a diode laser does on each surface
- Wood, plywood, leather, cork: engraving
- Slate: engraving, a shallow light-grey mark
- Powder-coated or painted metal: coating removal, a form of marking
- Anodized aluminium: marking
- Bare metal with spray: marking
- Glass: surface marking with a coating; see glass guide
Why it matters
- Settings: engraving depth comes from more power or passes. Marking needs just enough to change colour; more power can spoil it.
- Durability: engraved designs last as long as the item. Marked designs are durable on most products.
- Machine choice: if you need true metal etching or deep metal engraving, you need a fiber laser. See can a diode laser engrave metal.
For per-material starting values, see the settings charts.