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Prepare Photos for Laser Engraving — Free Dithering & Edge Detection Tool

Free online tool to prepare photos for laser engraving. High contrast 1-bit output with Floyd-Steinberg dithering and Canny edge detection. Supports invert for dark materials. Compatible with LightBurn, xTool, Glowforge, and LaserGRBL. Best DPI settings for wood, acrylic, and leather.

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Prepare Photos for Laser Engraving

Prepare a photo or logo as a black-and-white bitmap for laser engraving. Canny edge detection suits logos, text and outlines. Floyd-Steinberg dithering simulates photographic shading with black and white dots. The converter produces raster-ready bitmaps; true vector workflows require an SVG and a separate trace step.

Upload a high-contrast, well-lit photo or logo in JPG, PNG or WebP. Choose Canny for line work or Dithering for a photograph. Use the Invert toggle for dark materials. Export the PNG and import it into your laser software at the final size. Run a power and speed test grid on scrap material before engraving the final piece.

Drag & drop your image here

or

Browse Files

JPG, PNG, WebP, HEIC — Max 10MB

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Examples

Studio portrait — Before

Before

Studio portrait — After

After

Studio portrait

Skin and shirt turn into fine dot shading. The plain wall behind becomes light speckle that burns very faintly.

Mountain lake — Before

Before

Mountain lake — After

After

Mountain lake

Peaks, trees and the reflection keep a lot of texture. Good for wood, but expect long engraving times at this detail.

Dog portrait — Before

Before

Dog portrait — After

After

Dog portrait

Outline, eyes and nose are crisp. The ground behind the dog turns into speckle; crop it if you only want the dog.

Inverted for dark material — Before

Before

Inverted for dark material — After

After

Inverted for dark material

Invert Colors

Invert Colors swaps black and white, for slate or anodized aluminum where the laser makes light marks.

Weak result: backlit photo — Before

Before

Weak result: backlit photo — After

After

Weak result: backlit photo

The bright patch turns blank and the dark clothing becomes noise. Use an evenly lit photo.

Notes from testing this tool

On the dark-material example I turned on Invert Colors, because there the laser marks the lines rather than the background.

The backlit photo was the one I could not fix. The bright patch went blank and the shadows turned into noise.

In-depth Guide

Crop tightly to your subject. Light-colored materials such as maple, birch and light leather use standard output. Dark materials such as walnut or black anodized aluminum use inverted output because the laser reveals lighter material beneath the surface. Match export resolution to your machine's capability. In LightBurn, use Pass-through for an already dithered photo to avoid processing it again.

Build the test grid on a scrap of the exact material. Pick the square with the contrast and depth you want, and save the power and speed with the material and thickness. Re-run a small test after changing settings.

Never run a laser unattended. Wear laser-rated safety glasses matched to your machine's wavelength. Ventilate to the outdoors or through a proper filter. Confirm material safety before burning, keep the work area clear of dust and solvents, and never engrave unknown plastics. PVC and vinyl release toxic fumes; chrome-tanned leather should be avoided.

Images are processed locally in your browser and are not uploaded or stored by MakeLineArt. The site separately uses analytics and advertising services according to your consent choices and the privacy policy.

How to Use

  1. Upload the photo or logo you want to engrave (JPG, PNG, or WebP).
  2. Pick a processing mode: edge detection (Canny) for line work and text, or Dithering (Floyd–Steinberg) for photographic engraving.
  3. Use the Invert toggle when engraving onto dark materials like walnut or anodized aluminum.
  4. Switch to HD export to render at full machine resolution before sending to LightBurn, LaserGRBL, xTool, or Glowforge software.

What Makes This Tool Different

  • Floyd–Steinberg dithering for photo engraving and Canny edge detection for line work.
  • Invert mode for engraving onto dark materials (walnut, anodized aluminum, dark acrylic).
  • HD export at up to 2400 px — matches the resolution of professional engravers.
  • Compatible with LightBurn, LaserGRBL, xTool Creative Space, Glowforge, Ortur, and Atomstack.
  • No subscription, no usage cap, no watermark in the output file.

Frequently Asked Questions

What laser engravers are compatible with this tool?
Our tool works with all laser engravers that accept PNG images — including xTool, Glowforge, Ortur, Atomstack, and any machine using LightBurn software. The output is optimized high-contrast black-and-white.
Should I use dithering or pure black-and-white for laser engraving?
It depends on your material and desired effect. Pure black-and-white (threshold mode) works great for text, logos, and bold designs. Dithering simulates shading through dot patterns, ideal for photographs and portraits on wood or leather.
Can I invert the colors for dark materials like slate or anodized aluminum?
Yes! Use the invert toggle in the settings. When engraving on dark materials, the laser removes material to reveal lighter areas underneath, so you need an inverted image for correct results.
What DPI should I use for laser engraving?
For most laser engravers, 300 DPI is a good starting point. Use 150-254 DPI for faster engraving with less detail, or 300-600 DPI for detailed photo engravings on wood, acrylic, or leather. Our High-DPI export option outputs up to 2400px resolution for maximum detail. Match your DPI to your laser software settings (LightBurn, LaserGRBL, etc.) for best results.

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