STL to G-code Converter
How to convert STL to GCODE online
Upload your STL model
Choose printer profile
Generate and download G-code
What is a STL file?
STL (Stereolithography) is one of the most common 3D file formats used for 3D printing. It describes the surface geometry of a 3D object without including color, texture, or other attributes.
STL files are supported by virtually all 3D printers and modeling software. They are lightweight and easy to process, making them the go-to choice for rapid prototyping and additive manufacturing.
How to open STL files
STL files can be opened and edited in most 3D modeling and slicing programs such as Blender, Cura, TinkerCAD, or Fusion 360. They represent the geometry of 3D objects using triangles and are essential for prototyping and 3D printing workflows.
Use AnyConv to convert STL files to formats like OBJ or STEP for further editing, or to generate GCODE directly for 3D printing. It’s a fast and convenient way to prepare your models online without installing extra software.
Key facts about STL
- Full name: Stereolithography File
- Extension: .stl
- MIME type: model/stl
- Developed by: 3D Systems
- Initial release: 1987
Useful links and resources
What is a GCODE file?
GCODE is a machine control language used to operate 3D printers and CNC machines. It defines tool movements, speeds, temperatures, and other instructions required to build a physical object layer by layer.
GCODE files are generated from 3D models - typically in STL or OBJ format - by slicing software that translates geometry into precise printer commands. They are essential for additive manufacturing and universally supported by most 3D printer platforms.
How to open GCODE files
GCODE files can be opened with 3D printing and CNC control programs such as Pronterface, Repetier-Host, Cura, or OctoPrint, allowing users to preview toolpaths and adjust print parameters.
AnyConv lets you convert STL models directly into ready-to-print GCODE online. Upload your 3D model, choose your printer profile, and download optimized GCODE for fast, accurate 3D printing.
Key facts about GCODE
- Full name: G-code File
- Extension: .gcode
- MIME type: text/x.gcode
- Developed by: Numerical Control Community
- Initial release: 1958
Useful links and resources
💡 Tips & Tricks for Better 3D Printing
Check orientation carefully
Auto-orientation helps position the model for optimal printing, but manual adjustments often make a big difference. By slightly changing the angles, you can reduce visible layer lines, improve bed contact, and minimize the need for supports. Always review the orientation before slicing.
Don’t overcrowd the build plate
Placing too many models on the build plate at once increases the risk of print failure due to nozzle collisions, stringing, or uneven cooling. Start with one or two copies to ensure proper adhesion and consistent extrusion. Once you confirm the setup works, you can safely increase quantity.
Use brim for large models
For big or tall prints, a brim provides extra surface area around the base, improving first-layer adhesion and preventing warping or corner lift. It’s especially helpful for materials like ABS or PETG, which shrink more during cooling. Enable brim whenever you see edges starting to peel.
Analyze the G-code preview
In the G-code preview, the model, supports, and brim are shown in blue and can be viewed layer by layer. Red lines indicate Moves - travel paths without extrusion. Use this view to inspect each layer’s structure and ensure correct supports, wall paths, and movements before printing.
❓ Frequently Asked Questions
- Can I adjust print settings manually?Yes. After selecting a printer profile, you can fine-tune important parameters such as layer height, bed temperature, and nozzle temperature. You can also adjust scale, orientation, number of copies, and enable supports or brim to better prepare your model for printing.
- When should I enable supports or brim?Use supports if your model has overhangs that can’t be printed in mid-air. Enable brim for better bed adhesion, especially with large or tall models that are prone to warping.
- Do you support large STL files?Yes, but complex or very large models (over 10 MB) may take longer to load and preview. They also require more system resources and can cause browser slowdowns when viewing the generated G-code on weaker computers.
- How do I know if my model fits the print bed?After uploading the STL, you’ll see a grid and model dimensions in the preview. You can rescale or rotate the model to make sure it fits within the build area.
- Can I preview the G-code before printing?Yes. In the G-code Preview, the model, supports, and brim are displayed in blue and can be examined layer by layer. Red lines represent Moves - travel paths without extrusion. Use this preview to inspect the structure of each layer, verify supports and wall paths, and ensure everything looks correct before starting the print.
- The browser freezes when viewing STL or G-code preview. What should I do?Performance largely depends on your device’s hardware. For smoother performance, enable hardware acceleration in your browser settings - this often helps with rendering large models. Closing unused tabs and background apps can also improve responsiveness.
- Which printers are supported?The tool includes a catalog of printer profiles organized by manufacturer, model, nozzle size, and material. The list is updated and expanded regularly.
- What if I can’t find my printer in the list?Please send us an email with your printer’s brand and model. We’ll do our best to add it to the list of supported devices.
- Can I use G-code generated for one printer model on a different printer from the same brand?We don’t recommend it. Even printers from the same manufacturer can differ in build volume, firmware, or extrusion settings. Always select the exact model profile to ensure safe and reliable printing.
🗨️ What Users Say About AnyConv
I didn’t expect an online slicer to be this powerful. It handled my complex model really well. Love that I can adjust layer height and temperatures directly before generating the G-code.