To convert STL to glTF, choose your STL 3D models above, adjust the options if needed and press "Convert to glTF". The glTF downloads instantly: free, with no sign-up, and the file never leaves your device.
About the STL to glTF Converter
Need to turn a STL file into glTF? This free converter changes STL 3D models into glTF in a few seconds, right in your browser. People usually convert because STL has no colours or materials and is heavy to show on the web, while glTF gives you a glTF scene with embedded buffers. glTF files open in Blender, Three.js, Babylon.js, Godot, Unity (with plugins) and VS Code.
Models are loaded and exported with three.js, the most widely used open-source 3D library for the web. Because everything happens on your own device, your 3D models are never uploaded, stored or seen by anyone else, which makes it safe for client prototypes and unreleased product designs.
What to expect: geometry, normals and UV coordinates are converted, and the model is not rescaled.
How to use the STL to glTF Converter
- Click "Choose files" or drag your STL 3D models onto the box. You can add several at once.
- No settings are needed.
- Press "Convert to glTF". The conversion runs on your device and shows its progress.
- Download each glTF file, or use "Download all (ZIP)" when you converted several.
- Open the result in Blender or Three.js to check it; your original STL is never changed.
Tips & benchmarks
- The .gltf is written as a single file with its buffers embedded, so nothing goes missing.
- STL and OBJ files have no units; most slicers assume millimetres, so check the size after importing.
- Keep the file name simple (letters, numbers and hyphens) if you plan to upload the glTF to a website or government portal.
Frequently asked questions
How do I convert STL to glTF?
Click "Choose files", select your STL 3D models, adjust the options if you want, and press "Convert to glTF". The glTF downloads immediately; with several files you can download everything as one ZIP.
Is this STL to glTF converter free and safe?
Yes. It is completely free, with no sign-up, no daily limit and no watermark. The conversion runs inside your browser, so your 3D models never leave your phone or computer and nothing is stored on News Appite's servers.
Are textures and materials kept?
Basic materials and vertex colours are carried over where both formats support them. External texture image files referenced by OBJ or glTF are not bundled unless they are embedded in the source.
Can I convert several STL files at once?
Yes. Add as many STL files as you like; they are converted one after another and you can download them individually or together as a ZIP.
Does it work on iPhone, Android and Mac?
Yes. The converter works in any modern browser, including Chrome, Safari, Edge and Firefox, on Android, iPhone, iPad, Windows, macOS and Linux. No app is needed.
What is the difference between STL and glTF?
STL (Stereolithography) is a 3D printing mesh best suited to 3D printing, slicers such as Cura and PrusaSlicer, and CNC. glTF (GL Transmission Format) is a JSON 3D scene best suited to inspecting or editing 3D scenes by hand and web 3D pipelines.
Is there a file size limit?
There is no upload limit, because nothing is uploaded. The practical limit is your device's memory: files of a few hundred megabytes work on most computers, and phones handle smaller files comfortably.
How do I convert STL to glTF in Python?
Use trimesh: trimesh.load('input.stl').export('output.gltf'). If you just need the file, this converter does it in the browser without writing any code.
STL ko glTF kaise kare?
Is page par "Choose files" dabaiye, apni STL file chuniye aur "Convert to glTF" par click kijiye. glTF file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
STL vs glTF: format comparison
| STL | glTF | |
|---|---|---|
| Full name | Stereolithography | GL Transmission Format |
| Type | 3D printing mesh | JSON 3D scene |
| Created by | 3D Systems, 1987 | Khronos Group, 2015 (2.0 in 2017) |
| Compression | Binary or ASCII triangles | JSON with binary buffers |
| File extension | .stl | .gltf |
| MIME type | model/stl | model/gltf+json |
| Best for | 3D printing, slicers such as Cura and PrusaSlicer, and CNC | Inspecting or editing 3D scenes by hand and web 3D pipelines |
| Opens in | Cura, PrusaSlicer, Bambu Studio, Fusion 360, Tinkercad and Blender | Blender, Three.js, Babylon.js, Godot, Unity (with plugins) and VS Code |
What is a STL file?
STL was created by 3D Systems in 1987 for the first stereolithography printers. It describes a surface as raw triangles with no colour or units, and it is still the default file for 3D printing.
What is a glTF file?
glTF is the Khronos Group's open standard for transmitting 3D scenes efficiently. The .gltf variant is human-readable JSON that describes meshes, materials, animations and cameras.
Need it the other way round? Use the glTF to STL Converter.
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