What you can use
Ready images and designs can be a starting point for engraving, conversion or customization. The correct file type depends on whether you need a raster photo, line art or a vector path.
Laser Knowledge Hub · PixGrav
The Practical Guide to Laser Engraving and Cutting
From free laser files and photo preparation to LightBurn, EZCAD, materials, troubleshooting, maintenance and costing. Find the answer you need, then move image-related work directly into PixGrav.
CO₂FiberMOPADiodeLightBurnEZCADRDWorks
What are you trying to do—or what went wrong?
Search this guide or jump straight to the section that matches your laser workflow.
PixGrav Laser Hub
Free laser files and designs
Many laser users begin with searches such as “free laser engraving files”, “SVG for laser”, “DXF laser files” or “images for engraving”. PixGrav already has an image/template library inside the application, so this section acts as a public entry point to that existing resource rather than creating a separate gallery.
SVG / DXF / Vector
For clean lines, outlines and cutting, vector artwork is usually the practical choice. If you start from JPG/PNG, clean-up or vectorization may be required first.
Raster images
PNG/JPG/WebP work for photo engraving when contrast, physical size and tonal conversion are prepared for the target laser and material.
Use it with PixGrav
Open PixGrav and explore the image/template library.
PixGrav Laser Hub
How do I engrave a photo with a laser?
Photo engraving is not simply importing a JPG and pressing Start. The result depends on the material, laser type, physical output size, contrast, background and the way tones are converted into marks the machine can reproduce.
Photo engraving on wood
On wood, preserve useful tonal separation without turning large areas into solid black. Crop, background cleanup, controlled contrast and suitable dithering usually matter more than simply increasing power.
Photo engraving on metal
With Fiber/MOPA, preparation depends strongly on the metal and marking goal. The image should separate useful detail clearly and be prepared for the specific workflow. Bare metal generally requires fiber marking or an appropriate marking method rather than ordinary CO₂ photo engraving.
Photo engraving on mirror
Mirror work is often done from the back, affecting the reflective coating rather than treating it exactly like plain glass. Coatings vary, so always test on a sample first.
Slate, granite and dark surfaces
Dark surfaces often need a different tonal logic than wood. Inversion or alternative contrast mapping may be needed so the final mark reads correctly.
Use it with PixGrav
Already have the photo? Open Quick Start and choose the target material.
PixGrav Laser Hub
Why does a laser photo engrave badly?
Before changing speed and power, check whether the problem is already inside the image. Many failed engravings begin with low real resolution, crushed shadows, distracting backgrounds, excessive sharpening or an unsuitable dither.
Too dark / muddy
There may be too much information in the shadows, compressed tones or a dither pattern that does not match the material and real engraving resolution.
Too light
The source may lack contrast, the process may not create enough mark on the material, or inversion/tonal mapping may be wrong.
Blurred detail
Check source resolution, resizing, focus, mechanics and the real spot/line interval. A large file does not automatically contain useful engraving detail.
Good preview, bad physical result
If the prepared image is clean but the physical engraving is not, move the diagnosis to focus, optics, mechanics, machine settings or material behavior.
Use it with PixGrav
Test the image in PixGrav before blindly changing machine settings.
PixGrav Laser Hub
Dithering for laser engraving
Dithering converts tonal gradients into controlled patterns of dots or black-and-white elements. There is no single best algorithm for every material. The correct choice depends on the image, material, spot size and actual engraving density.
Floyd / error diffusion
A useful general starting point for photos because error is distributed to neighboring pixels, often producing natural tonal perception.
Stucki / Jarvis / Burkes
More complex diffusion patterns that can retain a different character in fine detail and smooth gradients. Test them on the actual material.
Atkinson
Often produces a lighter-looking result and can help when another dither fills midtones and shadows too aggressively.
Bayer / ordered
Creates a more regular repeated pattern. It can be useful for specific graphic effects but is not the first choice for every portrait.
Use it with PixGrav
Open PixGrav Dither and compare algorithms on the same source image.
PixGrav Laser Hub
DPI, px/mm and real image size
There is no magic DPI for all engraving jobs. What matters is how many real source pixels map to the physical output size and whether the machine/material can reproduce that density without excessive overlap.
Pixels are not millimeters
A 1000-pixel image can be engraved at many physical sizes. As output size increases, pixels per millimeter decrease.
DPI and line interval
In raster workflows, DPI relates practically to line/point spacing. More density does not always mean more detail; it can also mean more overlap and heat.
Resize before final dither
Lock output size and target resolution first, then create the final dither. Large resizing after dithering changes the pattern itself.
Use it with PixGrav
Quick Start lets you set physical width and DPI before generating the final file.
PixGrav Laser Hub
Vector, SVG, PNG and file preparation
Laser workflows commonly split into raster for photos/tones and vector for clean lines, outlines and cutting. Choosing the correct file type early saves a lot of work later.
PNG / JPG / WebP
Good for photos and raster engraving when the source is clean and has enough real resolution.
SVG / vector
Good for outlines, line art, logos and paths. Raster sources need tracing/vectorization followed by cleanup for noise or duplicate lines.
Background removal
For portraits and personalized objects, isolating the subject often improves engraving clarity dramatically.
Use it with PixGrav
Use Vectorize or Remove Background in PixGrav depending on the source.
PixGrav Laser Hub
LightBurn, EZCAD and RDWorks — where PixGrav fits
PixGrav does not replace the software that controls your laser. Its role is to prepare the image/artwork before it enters LightBurn, EZCAD or RDWorks, so machine software can focus on machine parameters rather than rescuing a weak source file.
LightBurn
Common in CO₂/diode workflows where layers, speed, power, interval and output are configured. PixGrav can supply a cleaned or dithered file first.
EZCAD2 / EZCAD3
Common with Fiber/MOPA. Hatch, speed, power, frequency and marking parameters are set there, while tonal image preparation is handled before import.
RDWorks / Ruida
A classic CO₂ workflow. For raster photos, it helps to lock size, contrast and dithering before import.
Use it with PixGrav
Prepare the artwork in PixGrav, then finish machine-specific settings in your laser software.
PixGrav Laser Hub
Materials for CO₂, Fiber, MOPA and Diode lasers
Material choice affects not only speed/power but also whether a process is appropriate or safe. There is no universal setting. Two sheets of MDF or two stainless parts can behave differently because of composition, coating, thickness or surface condition.
CO₂FiberMOPADiodeSafety first
Wood / MDF / plywood
CO₂ and diode lasers are widely used for engraving and cutting wood products. Resin, glue, density and thickness change the result, so test the actual stock.
Acrylic / plastics
Cast acrylic is common with CO₂. Many other plastics are unsuitable or hazardous. Never laser-process unknown plastics, especially materials that may release corrosive or toxic gases.
Metals
Fiber/MOPA is the primary route for marking many metals. Results depend on alloy, surface, coating, lens and the target process: mark, anneal, ablation or deep engraving.
Glass / slate / ceramics
These can look excellent but may be sensitive to thermal stress and material inconsistency. Start with a sample, not the final product.
Use it with PixGrav
For photo work, choose the material in Quick Start first, then tune the machine in your laser software.
PixGrav Laser Hub
Laser troubleshooting — common problems
When something goes wrong, do not change power, speed, focus, dithering and the source file at the same time. Split diagnosis into four stages: source file, conversion, machine, material. That is how you identify the cause instead of chasing random settings.
Why won’t the laser cut through?
Check focus, optics cleanliness, real output, speed, air assist, material thickness/quality and alignment. If it used to cut and now does not, first identify what changed in the system.
Why is wood or MDF burning?
Too much energy per point, low speed, weak air assist, poor focus or poor smoke extraction can increase scorching and fire risk.
Why don’t shapes close / why are steps lost?
Check belts, pulleys, acceleration, mechanical resistance, stepper/driver behavior and whether the error always occurs in one direction or only at high speed.
Fiber laser suddenly feels weak
Start with focus, lens/protective window, correct parameters, power delivery and repeatability. A sudden global change should not be treated as a simple parameter tweak.
Use it with PixGrav
If the problem appears to begin in the image, test the same source in PixGrav before changing the machine.
PixGrav Laser Hub
Speed, power, frequency and test grids
Searches such as “MDF 3 mm laser settings” or “what frequency for stainless steel” are useful as starting points, not guaranteed recipes. Correct settings depend on actual output, lens, spot, coating, material, machine condition and the production goal.
CO₂ / Diode
Run a small test grid on the real stock. Change one or two variables at a time and keep notes.
Fiber / MOPA
Speed, power, frequency, pulse width (when available) and hatch interact. Color marking and specialized MOPA work require a structured matrix test, not one magic internet value.
Production
After finding acceptable quality, repeat on another sample from the same batch and measure production time. The visually strongest result is not always the best production setting.
Use it with PixGrav
Use PixGrav to keep the source file stable while you test machine parameters.
PixGrav Laser Hub
Laser maintenance: focus, lens, mirrors, chiller and air assist
Correct maintenance does not fix a bad source image, but it allows the machine to reproduce a prepared file consistently. If the same file behaves differently from day to day, maintenance and operating conditions are part of the diagnosis.
CO₂ optics
Mirrors and lenses should be checked for contamination or damage using the manufacturer’s safe procedure. Do not scrub laser optics with random materials.
Focus / lens
Incorrect focus reduces energy density and detail. Changing a lens changes field size, spot size, working distance and engraving/cutting behavior.
Chiller
Use the coolant/water type and temperature range specified by the tube and chiller manufacturer. Stability matters more than an arbitrary magic number.
Air assist & extraction
Air assist and smoke extraction affect cleanliness, safety and repeatability. Never leave a laser cutting combustible material unattended.
Use it with PixGrav
If the machine is stable but image quality is not, inspect the source and processing in PixGrav.
PixGrav Laser Hub
Laser engraving costing and production
A sustainable laser job costs more than the sheet of material. Include machine time, setup, testing, design/prep work, consumables, rejects and operator time. PixGrav can reduce image-preparation time, but the final price needs to cover the entire workflow.
Material
Raw material cost plus waste and failed test pieces.
Machine time
Real production time, including loading, focus, positioning and changes—not just active engraving time.
Design / prep
If a customer supplies a poor file, preparation has value. Do not treat cleanup and conversion time as free.
Use it with PixGrav
The faster you move from raw customer image to a stable laser-ready file, the more predictable production becomes.
FAQ
Frequently asked laser engraving questions
Short answers to questions that repeatedly appear in real laser workflows.
What software do I need for laser photo engraving?
You normally need two layers: image-preparation software and the machine-control software. PixGrav handles crop, enhancement, background removal, dithering/vectorization; LightBurn, EZCAD or RDWorks then handles machine parameters.
Which dithering method is best for wood?
There is no single best method for every photo and wood type. Floyd, Stucki, Atkinson and other patterns behave differently. Compare previews and run a small material test.
What DPI should I use for laser photo engraving?
Useful DPI depends on physical size, spot size, line interval and material. Excessive DPI can increase overlap without adding real detail.
Can I engrave photos on metal?
Yes, typically with Fiber/MOPA or an appropriate marking process. Image preparation needs to match the material and marking goal.
Can I engrave a photo on a mirror?
Yes in many mirror workflows, often from the back to affect the reflective coating. Coatings vary, so test first.
Why won’t my laser cut through MDF?
Check focus, optics cleanliness, alignment, real output, speed, air assist and the actual MDF thickness/quality.
Why is my photo engraving too dark?
Possible causes include excessive energy, overly dense dithering, compressed tones or incorrect inversion. First decide whether the issue is the image or the machine.
How do I convert an image to SVG for laser?
Use vectorization/tracing, then clean unwanted details or duplicate lines. PixGrav includes a vectorization workflow for suitable source images.
Where can I find free laser files?
PixGrav includes an image/template library inside the application that you can use as a starting point for laser work.
Are speed/power settings the same on every laser?
No. Laser output, lens, material, coating, mechanical condition and production goal all change the result. Treat online values as starting points and confirm with a test.
Have an image you want to engrave?
Use PixGrav to clean, enhance, dither or vectorize the artwork before taking it into your laser-control software.
Safety note: Laser parameters depend on the machine and material. Run small tests, follow manufacturer guidance, and never process unknown or hazardous materials.