Turn an OBJ model into an STL for 3D printing. It is converted in your browser, so the file never leaves your device.
Drop OBJ files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop OBJ files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. There is nothing else to set. The work happens in this tab.
Save the STL, or download everything as one ZIP if you converted several files.
The OBJ to STL converter is part of this page and runs inside your browser. Your 3D models are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
Slicers and printers want STL, a bare list of triangles. An OBJ may hold polygons, texture coordinates, normals and materials that a printer cannot use, so the colours and textures are dropped and only the shape is kept. Check that the model is closed and watertight, because a printer needs a solid.
The model is converted as triangles: lines and points are dropped, positions are used as they are, and no axis conversion is applied, so a model that is Y-up in glTF and Z-up in STL, OBJ and PLY is written exactly as it was read. STL stores geometry only, so vertex colours and materials are dropped. Models up to 3,000,000 triangles are accepted.
OBJ is a text format that lists vertices, texture coordinates, normals and faces, with materials in a companion .mtl file. It has no animation or scene hierarchy, but it is so simple that almost every 3D program reads and writes it.
Opens in Blender, Maya, 3ds Max, MeshLab and nearly every 3D program
OBJ converterSTL describes a surface as a list of triangles and nothing else: no colour, no materials, no units. That simplicity made it the standard input of 3D printers and slicing software. It exists as binary and as text; the binary one is much smaller.
Opens in Every slicer and 3D printing program, CAD tools and Windows 3D Viewer
STL converter| OBJWavefront OBJ model | STLSTL 3D model | |
|---|---|---|
| Stands for | Wavefront OBJ | Stereolithography file |
| Type | 3D model | 3D model |
| Compression | None (text) | None |
| Introduced | The late 1980s, by Wavefront Technologies | 1987, by 3D Systems |
| Opens in | Blender, Maya, 3ds Max, MeshLab and nearly every 3D program | Every slicer and 3D printing program, CAD tools and Windows 3D Viewer |
| Best for | Exchanging a mesh between 3D programs | 3D printing |
| File extension | .obj | .stl |
No. The OBJ to STL conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
No further quality is lost: STL stores the decoded audio exactly. The result is identical in content.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the OBJ file, press Convert and save the STL. There is nothing to install.
Yes. Models up to 150 MB and 3,000,000 triangles are accepted; a larger one is refused with a message. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.