STL File Converter is a free tool. Upload a 3D model to this STL file converter, pick STL, OBJ, 3MF, or GLB as the output format, preview the shape, and download the converted file.
Runs in your browser · your file is not uploaded · no sign-in needed
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Your 3D Model Will Appear Here
Fill in the options on the left, then press the button. The work is done in your browser.
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Drag & drop your file here or click to browse
An STL file converter switches a 3D model between STL, OBJ, 3MF, and GLB formats in your browser. Upload a model, pick the format you need, preview the result, and download it. It suits anyone whose printer, slicer, or software expects a different file type than the one they were given, since the shape carries over but colours and textures do not.
Select Upload a 3D File and add the model you want to change. It loads in your browser and previews in 3D, without being sent to a server at any point.
Pick STL, OBJ, 3MF, or GLB from Convert To, depending on what your printer or software expects. Compare the preview against the original to confirm the shape looks correct.
Press Convert File to produce the new format. Keep in mind the result contains the shape only, since colours and textures are not kept, then download it for your next step.
Most slicers accept STL, but some newer workflows prefer 3MF for its extra printing data. Convert between the two so your file matches what your slicing software expects before you load it in.
Models from 3D design or scanning tools often come as OBJ. Convert an OBJ to STL when you need a format your printer's software recognises, or convert the other way if a program only accepts OBJ.
If you only need the geometry of a GLB model, not its colours or textures, convert it to STL or OBJ to strip that extra data out and keep the file smaller and simpler to share.
It converts between STL, OBJ, 3MF, and GLB. Upload a model in any of these, pick the format you want as output, and download the converted file once you have checked the preview.
No. The converter runs in your browser, so no account is required and no credits are used. Your model is never uploaded to a server, so it stays on your device while it converts.
No, the converted files contain the shape only. If your original GLB or OBJ carried colour or texture data, that is not kept in the output, so save a copy of the original if you need the appearance later.
STL stores only a mesh of triangles describing shape, while OBJ can also store colour, texture, and material references. STL is the more common format for 3D printing, and OBJ is more common in general 3D graphics work.
3MF can carry more information than STL, such as colour, multiple parts, or print settings, in a single file. Some newer slicers use this to simplify multi-part or multi-colour prints, though plain STL still works for most single-part models.
That depends on how the original file is built, since the converter carries over the shape data it is given. If a model has several separate parts, check the preview after converting to confirm they all came through as expected.
Fix mesh errors such as holes or bad normals after converting your file to STL.
Handle a 3MF to STL conversion on its own if that is the only format change you need.
Check the converted file's shape in 3D before you load it into your slicer.
Open a GLB file here first to check it before converting it to STL or OBJ.
Your file stays on your device. It is not uploaded.