How to Convert Sketch to G-code Free, Step by Step
Need a G-code from a sketch? Here is how to convert Sketch to G-code, what usually goes wrong, and how to get a file you can use first time.
Why convert Sketch to G-code?
A G-code is motion commands a controller runs directly: move here, at this speed, with the tool on. No interpretation left. The machine does exactly what the file says.
- Laser cutting and engraving.
- CNC routing.
- Sending straight to the controller.
The catch is the sketch itself. Paper texture, shadows from the phone and uneven pencil pressure all read as marks unless they are cleaned away first. That is why the conversion matters as much as the file you start with.
Where most converters let you down
Plenty of tools will happily take your sketch and give you something back. The trouble is what they give you: many write coordinates in pixels with no units, upside down, with outlines that do not close. You only find out later, when the file will not cut, print, import or open the way you expected.
What you actually want is machine geometry in real millimetres or inches, the right way up, with closed contours. That is the standard this Sketch to G-code converter is built to.
How to convert Sketch to G-code in 4 steps
- Draw in dark ink on white paper and photograph it square on.
- Upload it here; centerline mode is already chosen.
- Set the real width, the feed rate and laser power or cut depth.
- Download the .gcode and dry-run it above the material first.
Why Veconvert is the better Sketch to G-code converter
- Real units in the file. G-code output carries millimetres or inches, so it imports at the size you set.
- The right way up. Image coordinates run downwards; machine coordinates run upwards. The conversion flips them so the part is not mirrored.
- Closed contours. Outlines join up, and anything that does not is flagged before you download.
- Preview the machine file itself. The download is parsed back and drawn, so what you see is what the machine will get.
- Nothing uploaded. Drawings for clients stay on your machine.
What happens to your file
Your sketch is first traced in the browser into clean outlines. For a machine the trace is set up for cutting rather than colour: one outline where a cutter should go, with photos turned into line art instead of blotchy shapes.
The conversion runs in your browser, so the file is never uploaded: client work, statements and unreleased designs stay on your computer.
Getting the best G-code: mistakes to avoid
- Photograph the sketch in daylight, straight on, with no shadow from your phone across the paper.
- High-contrast sketch artwork gives the cleanest toolpaths: dark shapes on a light background.
- Set the finished width in the settings before downloading, then check the size the page reports.
- For a laser, decide whether each shape should be cut or engraved in your laser software; the file gives you clean outlines for either.
- Run a test cut on scrap before cutting good material, as you would with any new file.
What it costs
Yes, converting is free: the conversion and checking the result cost nothing, and the work runs in your browser, so nothing is uploaded. The side-by-side preview on the converter pages comes with a free account. Saving the finished file is paid: $3.49 for one file ($3.99 for a technical file such as DXF, G-code, STL or embroidery) with no account needed, or included in a plan from $6.99 a month.
You see the result before you spend anything, so you only pay for a file you are happy with.
Frequently asked questions
How do I turn a drawing into G-code?
Upload a photo or scan of the drawing here, keep centerline mode for single-line engraving (or outline mode for cutting shapes out), set the size and feed, and download the G-code.
Does it work with a laser and a CNC router?
Yes. Laser mode writes M3/M5 with a power value; router mode retracts to a safe Z and plunges to your cut depth for each path.
How do I convert Sketch to G-code?
Drop your sketch into the box at the top of this page and press Convert to G-code. The conversion runs in your browser in a few seconds. Check the result, then download a G-code.
What units does the G-code use?
Millimetres or inches, whichever you choose. The size you set is the size the machine cuts.
What is the best drawing to G-code converter?
One that gives you machine geometry in real millimetres or inches, the right way up, with closed contours, shows the result before you pay, and does not upload your file. That is what this page is built to do.
Is it free?
Yes, converting is free: the conversion and checking the result cost nothing, and the work runs in your browser, so nothing is uploaded. The side-by-side preview on the converter pages comes with a free account. Saving the finished file is paid: $3.49 for one file ($3.99 for a technical file such as DXF, G-code, STL or embroidery) with no account needed, or included in a plan from $6.99 a month.
Is my file uploaded?
The conversion runs in your browser, so the file is never uploaded: client work, statements and unreleased designs stay on your computer.