Free 3MF Converter: No Sign-up, Files Never Uploaded
This free 3MF converter runs entirely on your device. You do not need an account or a login, and your files are never uploaded, so they never leave your browser.
3MF in short. 3D Manufacturing Format: a ZIP-based format built for 3D printing. Stores colours, materials and print settings that STL cannot.
From 3MF you can convert to OBJ, STL, GLB, glTF, PLY and USDZ, and 1 more formats. These pairs run on code already in the page, with no extra engine to download.
3MF is a source format here. Writing 3MF is not offered; read it and export OBJ, STL or GLB instead.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Add your 3MF files by dragging them onto the converter or by using the file picker.
- Choose the format you want from the list of targets that fit your file.
- Open the options if you want to change quality or size, or keep the defaults.
- Press Convert and watch the progress shown for each file.
- Download each result, or take them all together as one ZIP when you converted several files.
Features
- Reads .3mf files.
- Free, with no watermark added to the result.
- No sign-up and no login.
- Your files are never uploaded and never leave your device.
- Batch conversion with a ZIP download for several results.
- The input is recognised by its content, not only by its file name.
- 7 target formats to choose from.
Supported formats
| Format | Read | Write | Notes |
|---|---|---|---|
| Wavefront OBJ.obj | Yes | Yes | Plain-text 3D mesh format from Wavefront, supported by almost every 3D tool. |
| STL (3D).stl | Yes | Yes | The standard input for 3D printing: geometry only, as triangles. |
| GLB.glb | Yes | Yes | Binary glTF: a whole 3D scene in a single file. |
| glTF.gltf | Yes | Yes | JSON-based glTF, usually with separate files for geometry and textures. |
| PLY.ply | Yes | Yes | Polygon File Format, developed at Stanford for 3D scanner data. |
| 3MF.3mf | Yes | No | Writing 3MF is not offered; read it and export OBJ, STL or GLB instead. |
| FBX.fbx | Yes | No | FBX is Autodesk’s proprietary format, so it can be read but not created. |
| Collada (DAE).dae | Yes | No | Collada is read only here; export to GLB or glTF instead. |
| OFF.off | Yes | No | OFF is a simple research format that is read only here; convert it to OBJ or STL. |
| 3DS.3ds | Yes | No | 3DS is a legacy format that is read only here; convert it to OBJ or GLB. |
| USDZ.usdz | No | Yes | Apple’s packaged 3D format for AR Quick Look on iPhone and iPad. |
About the formats
About 3MF
3D Manufacturing Format: a ZIP-based format built for 3D printing.
Stores colours, materials and print settings that STL cannot.
It does not support transparency.
What 3MF can become
3MF to OBJ runs in the page.
3MF to STL runs in the page. STL keeps geometry only; colours, textures and materials are dropped.
3MF to GLB runs in the page.
3MF to glTF runs in the page.
3MF to PLY runs in the page.
3MF to USDZ runs in the page.
3MF to PNG runs in the page. A still preview rendered from a default camera angle.
Why 3MF is read only
Writing 3MF is not offered; read it and export OBJ, STL or GLB instead.
Privacy: how it works
- Your 3MF files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
Tips
- Check the scale and the units in your slicer or viewer after conversion.
- Colours and textures only survive between formats that can store them; STL keeps geometry only.
- Keep the original model as the master.
- Preview the converted file before you print or publish it.
- 3MF cannot be created here, so pick one of its targets instead.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your 3MF files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow or fail on a weak phone or an older computer. Close other heavy tabs and convert 3MF files one at a time if a big batch struggles.
What can I convert 3MF files to?
You can convert 3MF to OBJ, STL, GLB, glTF, PLY, USDZ and PNG. Pick one on the converter and it applies to every file you add.
Can I convert other files to 3MF?
No. Writing 3MF is not offered; read it and export OBJ, STL or GLB instead.
Can I convert many 3MF files at once?
Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.