Laser Cut File Converter — AI Vector Conversion for CNC & Laser Cutting

A file that looks right on screen can still be unusable on a machine, and the reason is almost always the same: path count. A logo drawn for print can carry hundreds of overlapping shapes and nobody notices, because ink does not care. A cutting head does. It follows every path it is given, in order, lifting and plunging between each one.

A sign maker in Edinburgh put a number on it for us this month. His own house standard for a vinyl or laser job is around 32 paths for a typical wordmark and emblem. When we first sent him one of our print-mode conversions it came back with over three hundred, and he was right to reject it — the cut would have taken twenty minutes instead of two and the edges would have been ragged where paths met.

Two checks, thirty seconds, before you load anything into your machine:

1. Select one letter and drag it. One click should grab one shape. If a single letter breaks into a dozen slivers, the trace over-segmented and the file will fight your cutter.
2. Open the counters. Zoom into an O, an A, an 8. The holes must be holes. If they are filled solid, the fill rule was lost and your machine will cut the middle out of every closed letter.

A maker sent us a logo this week for a CNC sign — a mountain lion over distressed metal lettering with a rifle round underneath. Beautiful artwork. Completely uncuttable as supplied.

The problem was the distressing. All that worn, scratched texture reads to a tracer as thousands of tiny separate islands, so the machine either chokes on the file or spends an hour producing confetti. The fix is not a better tracer, it is a different intent: cut mode throws the texture away and keeps only what a machine can follow — the animal as one solid silhouette, the letters as solid shapes with their outline, the round intact. That file cut in minutes.

The same rule applies to gradients, drop shadows, glows and photographic backgrounds. A cutter has one depth and one edge. Anything that exists only as a shade needs to become a shape or disappear before the file reaches the machine.

The single most common cause of a disappointing cut file is a source image that never had the detail in the first place. A glass and signage firm in Australia wrote to tell us our conversion of their logo was no better than what they already had. They were right, and the reason took one measurement: the logo we had been given was 150 by 65 pixels, lifted from their own website. At that size the lettering is about six pixels tall. The detail is not compressed, it is absent, and no software invents it — not ours, not Image Trace, not a paid service.

Where the line falls, roughly:

• Above 1024 px on the short side — expect a clean cut file, including small text.
• 256 to 1024 px — large shapes and heavy lettering come back well; fine serifs and thin rules come back approximate.
• Below 256 px — do not spend the material. Ask the customer for the original, or have the mark redrawn.

Upscaling first does not rescue this. A customer paid for a 2x upscale on a source that was already past the threshold and got nothing extra for it, which we told her and refunded. More pixels only help when the detail exists and the file is simply small.

Most cutting problems that look like conversion problems are really format problems.

• DXF is what CNC routers, plasma tables and most CAM software expect. Ours comes out as AutoCAD 2000 (AC1015) with real units and correct extents, so a 169 x 113 mm design arrives as 169 x 113 mm and not as an arbitrary box you have to rescale by eye.
• G-code skips CAM entirely when you already know your material and depth. Useful for repeat jobs, less so for anything you want to tweak.
• SVG is what LightBurn, Glowforge and Cricut Design Space import happily. It is the right answer for laser work and the wrong answer for a router that wants layers and depths.
• EPS or AI matter more than people expect. Sign-industry software such as FlexiSign reads them properly and treats SVG as a second-class import — a shop told us so directly after our SVG gave him grief. If your workflow is sign-making, take the EPS.

You get every one of these from the same conversion, so there is no reason to convert twice. Export the format your machine reads rather than the one you happen to have.