Using SVG Files with Glowforge: Tips and Common Problems

There is a special kind of joy in watching a Glowforge trace a design you made yourself, and a special kind of groan when the preview shows your gorgeous ornament three-quarters of the size you planned. Most Glowforge file problems come down to a handful of causes, and once you know them an upload goes from guesswork to routine.

Glowforge is a closed system: you design or upload in Glowforge's web app, and the machine is driven from there. LightBurn and similar programs are not the way in. That makes the file you upload even more important, and SVG is the best format to give it.

Which file types does Glowforge accept?

According to Glowforge's support pages, the app takes SVG and PDF for cutting and engraving, JPG and PNG for engraving only, and DXF for Premium members. Community reports on DXF are mixed, with some uploads working and others rejected, so treat DXF as a bonus and SVG as your daily format. More on that in can Glowforge open DXF files.

Features and plans change over time, so check Glowforge's current help pages before relying on any single detail.

How to upload an SVG, step by step

1. Open the Glowforge app in your browser and start a new design.
2. Choose Upload (or drag the file into the window).
3. Wait for the preview. Click the design and read the width and height.
4. Choose the material. Proofgrade materials set the settings for you; for other materials you enter your own.
5. The app groups what it finds into operations. Assign each group Cut, Score or Engrave.
6. Position the design on the material, press the button on the machine and run it.

Pro tip: Do a dry run on cardboard or scrap first. The two minutes it takes will tell you whether the size, position and settings are right.

How Glowforge decides what to cut and what to engrave

Glowforge reads the structure of your SVG. In general, thin strokes become lines you can set to cut or score, and filled shapes become areas to engrave. The colors you used in the file help the app group things, so it is wise to give cut lines one color and engraving another. Our files follow that rule: a red hairline for CUT and a black fill for ENGRAVE. Read what a hairline stroke is for why thin lines matter.

The wrong-size problem

This is the number one Glowforge SVG complaint. Different design programs write SVG sizes at different resolutions: Inkscape's modern default is 96 pixels per inch, while Adobe Illustrator uses 72. Community discussions suggest the Glowforge app assumes a resolution unless it can recognize the program that made the file, and the mismatch makes the design 25% bigger or smaller (the ratio between 72 and 96 is 0.75). That is why an ornament can arrive at the "wrong" size.

Common mistake: fixing the wrong-size by eye in the app and cutting. Always measure a printed square or a test cut once. If a 50 mm square cuts at 50 mm, you can trust every file from the same source.

Pro tip: Make a 100 mm test square in your design program, upload it, and note what Glowforge shows. If it says 100 mm, your workflow is good. If it says 75 mm or 133 mm, you now know your correction factor.

When you export from Inkscape, choose Plain SVG instead of Inkscape SVG and set the document units to millimeters or inches. Our Inkscape workflow walks through it. For other apps, see scale laser files correctly.

Text and fonts

Convert text to outlines (paths) before you export. If you do not, a missing font can shift letters or drop them altogether, and the preview will not match what you drew. The Glowforge app has its own text tool, so for simple lettering you can also add text inside the app.

Other common problems

Fitting more per sheet

Glowforge beds are not huge, so arrangement matters. Group parts tightly, leave a small gap for the kerf and the material's own variation, and check the maximum material size in your model's specs. Putting nine pieces in a grid instead of two is the difference between an hour of work and fifteen minutes. A nesting tool can do better than a hand-made grid, but a simple grid already helps.

Next step

Download an SVG such as the peeking bunny in a Santa hat, upload it, read the size, and do a 100 mm square test the same day. Record the correction (if any) in a note taped to your machine. You will thank yourself every time you start a new design.