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STL to G-code Converter
Online STL Slicer
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Drop your STL file here

or click to browse your files

Choose STL File
Binary STLASCII STL100% LocalNo UploadUp to 250MB

How to Convert STL to G-Code

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Upload Your STL File

Drag and drop or browse to select your .stl model file.

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Configure Print Settings

Set layer height, infill density, print speed, and support options.

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Download Your G-Code

Click Convert and download the print-ready .gcode file for your printer.

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100% Private. Your STL file never leaves your computer. All slicing is done locally in your web browser.

Upload an STL file to begin

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Slice Settings

PLA · 0.2mm

Material

mm
Normal
mm
mm

🔒 Privacy & Security

100% client-side — your STL never leaves your browser. All file processing and G-code generation is performed locally.

Why Use Our STL to G-Code Tool

Discover the features that make our free online 3D print slicer the best choice for fast, local G-Code generation.

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Why Use Our STL to G-Code Tool

  • 100% free with no sign-up required
  • Browser-based — works on Windows, Mac, and Linux
  • Supports standard FDM printers including Ender, Prusa, and Creality
  • Adjust layer height, infill, supports, and temperature settings
  • Fast conversion — most files process in under 30 seconds
  • Secure: your files are never stored on our servers
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What Is an STL to G-Code Converter?

An STL to G-Code converter — also called a slicer — translates a 3D model stored in STL (Standard Tessellation Language) format into G-Code, the machine language your 3D printer reads. G-Code tells the printer exactly how to move, how fast to extrude, and at what temperature to operate. Our free online slicer makes this process simple without downloading any software.

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Supported Printers & File Formats

Our tool generates standard G-Code compatible with most FDM desktop 3D printers including Creality Ender 3, Prusa i3, Anycubic, Artillery, and more. Input format: .STL (binary and ASCII). Output format: .gcode.

Deep Dive: Mastering STL to G-Code Slicing & 3D Printing Optimization

Converting 3D models into machine language involves calculating perimeters, layers, speeds, and volumetric extrusion values. Below is a comprehensive guide to understanding slicing coordinates, standard G-Code parameters, and configuration tips for FDM 3D printing.

How 3D Slicers Process STL Meshes

STL files represent 3D geometry using raw, unstructured triangulated surfaces. Slicers take this raw polygon mesh and cut it horizontally into equal vertical slices based on your target layer height (e.g., 0.2mm). The software then calculates the perimeter outlines (walls), plans internal structural infill matrices, and outputs continuous XY movement coordinates mixed with volumetric extrusion commands (E-axis coordinates) to form a compiled G-Code script.

FDM Printer Configuration Tips

  • Creality Ender 3 / Pro: Ideal nozzle temp: 200°C for PLA, bed temp: 60°C. Recommended print speed: 50–60mm/s. Retraction distance: 5mm (Bowden tube setups).
  • Prusa i3 MK3S+ / MK4: Direct drive extruder allows short retraction distances (0.8–1.2mm). Standard PLA nozzle temp: 215°C, bed temp: 60°C.
  • Anycubic Kobra / Vyper: Adjust bed leveling offset carefully. PLA: 200°C, PETG: 235°C. Retraction distance: 2mm (Direct drive configuration).

Standard G-Code Commands Reference Table

CommandMeaningDescription
G0Rapid Travel MoveMoves the printer head quickly to new XY coordinates without depositing filament.
G1Controlled Extrusion MoveMoves to XY coordinates while pushing a controlled volume of filament (E) through the nozzle.
G28Home All AxesResets the printer head coordinates by moving X, Y, and Z to the endstop limit switches.
G90Absolute PositioningTells the machine to interpret XYZ coordinates relative to the build plate origin (0,0,0).
M104 / M109Set Nozzle TemperatureM104 sets hotend target temperature; M109 sets hotend target temperature and waits until it is reached.
M140 / M190Set Bed TemperatureM140 sets print bed target temperature; M190 sets bed target temperature and waits until it is reached.
M106 / M107Part Cooling Fan ControlM106 turns on the cooling fan at a specific speed index; M107 turns the cooling fan off.

Frequently Asked Questions

An STL to G-code converter is a software utility that translates 3D surface mesh geometry (.stl format) into sequential coordinates and movement commands (G-code). This G-code is the programming language that CNC machines and 3D printers read to know exactly how to move, extrude, and build your physical model layer by layer.
Using our online tool is simple: 1) Upload your STL file by dragging and dropping it into the dashboard. 2) Configure your print parameters (layer height, temperatures, speeds, infill). 3) Click 'Generate G-code' to start slicing. 4) Review the real-time 3D preview and click 'Download G-code' to get your ready-to-print file.
Yes! Our STL to G-code converter is completely free to use. There are no registration forms, no usage limits, and no hidden fees. Slicing runs 100% locally in your web browser using WebAssembly, ensuring maximum performance and privacy.
This tool accepts STL (.stl) files—supporting both binary and ASCII formats. The generated output file is standard G-code (.gcode), which is compatible with most standard 3D printers and CNC machines.
Absolutely! You have complete control over crucial slicing settings including layer height, nozzle diameter, wall counts, infill density/pattern (Grid, Gyroid, Lines, etc.), nozzle and bed temperatures, print/travel speeds, retraction rates, and optional support structures, brims, or rafts.
The G-code is generated with professional-grade precision using industry-standard pathing algorithms. While the mathematical model is highly accurate, your final print quality will also depend on the design complexity of your STL mesh and the physical calibration of your 3D printer.
Yes, once the website loads in your browser, you can disconnect from the internet. All file processing, rendering, and G-code calculations are executed locally in your browser's memory without uploading any data to external servers.
The generated G-code adheres to standard configurations, making it compatible with most FDM 3D printers running Marlin, RepRap, Grbl, and other open-source firmware platforms (e.g. Creality Ender, Prusa i3, Anycubic, etc.).