Turn an STL mesh into an OBJ for modelling and rendering. It is converted in your browser, so the file never leaves your device.
Drop STL 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 STL 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 OBJ, or download everything as one ZIP if you converted several files.
The STL to OBJ 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.
STL is the format 3D printers take, but modelling and rendering programs generally prefer OBJ, which is a text format that most of them read and write. STL has no UV coordinates, colours or units, so the OBJ holds the same triangles and nothing new; its advantage is simply that more tools import it.
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. Vertex colours are written into the OBJ; materials and textures are not. Models up to 3,000,000 triangles are accepted.
STL 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 converterOBJ 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 converter| STLSTL 3D model | OBJWavefront OBJ model | |
|---|---|---|
| Stands for | Stereolithography file | Wavefront OBJ |
| Type | 3D model | 3D model |
| Compression | None | None (text) |
| Introduced | 1987, by 3D Systems | The late 1980s, by Wavefront Technologies |
| Opens in | Every slicer and 3D printing program, CAD tools and Windows 3D Viewer | Blender, Maya, 3ds Max, MeshLab and nearly every 3D program |
| Best for | 3D printing | Exchanging a mesh between 3D programs |
| File extension | .stl | .obj |
No. The STL to OBJ 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: OBJ 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 STL file, press Convert and save the OBJ. 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.