STL to GCode Converter: Prep Your 3D Prints
3D printers don't print STL models directly — they need GCode, the instruction language that tells the machine where to move and how much filament to lay down. An STL to GCode converter handles the conversion, right in your browser, so your model is print-ready in seconds. Nothing uploaded, no signup.
STL vs GCode
- STL — the 3D model: a mesh of triangles describing the shape
- GCode — the instructions: movement, temperature, extrusion, and speed
- Slicing — the process that turns the model into print instructions
- Your printer reads GCode, not STL — so the conversion is required
Convert STL to GCode free with Tooly
The Tooly STL to GCode Converter keeps it simple:
- Upload your .stl model
- Get GCode prepared for your printer
- Runs in your browser — nothing is uploaded
- Free, no signup, no watermark
Open STL to GCode
When you'll use it
- Preparing downloaded models for your printer
- Testing prints without installing desktop slicing software
- Quick slices for prototypes and iterations
- Learning how slicing works by comparing inputs and outputs
Frequently Asked Questions
Is this STL to GCode converter really free? Yes — unlimited conversions, no account, no watermark.
Does it match my specific printer? Output targets standard settings; for printer-specific profiles, use your slicer's presets for final prints.
Is my model uploaded? No — conversion runs entirely in your browser, so your model stays on your device.
What else should I check? For designers, the Image to PNG and Color Converter tools handle the visual side.