To convert OBJ to STL, choose your OBJ 3D models above, adjust the options if needed and press "Convert to STL". The STL downloads instantly: free, with no sign-up, and the file never leaves your device.
About the OBJ to STL Converter
Convert OBJ to STL online for free, with no account and no watermark. OBJ files are bulky text and easily lose their materials, so switching to STL is the quickest way to get a print-ready STL for 3D printing, slicers such as Cura and PrusaSlicer, and CNC.
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; STL keeps only triangles, so colours and textures are left out.
How to use the OBJ to STL Converter
- Click "Choose files" or drag your OBJ 3D models onto the box. You can add several at once.
- No settings are needed.
- Press "Convert to STL". The conversion runs on your device and shows its progress.
- Download each STL file, or use "Download all (ZIP)" when you converted several.
- Open the result in Cura or PrusaSlicer to check it; your original OBJ is never changed.
Tips & benchmarks
- The STL is binary (smaller and faster to load); colours, textures and materials are dropped because STL cannot store them.
- 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 STL to a website or government portal.
Frequently asked questions
How do I convert OBJ to STL?
Click "Choose files", select your OBJ 3D models, adjust the options if you want, and press "Convert to STL". The STL downloads immediately; with several files you can download everything as one ZIP.
Is this OBJ to STL 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?
No. STL can only store triangles, so colours, textures and materials are dropped. The geometry itself is converted exactly.
Can I convert several OBJ files at once?
Yes. Add as many OBJ 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 OBJ and STL?
OBJ (Wavefront OBJ) is a text-based 3D mesh best suited to exchanging meshes between Blender, Maya, 3ds Max, ZBrush and game engines. STL (Stereolithography) is a 3D printing mesh best suited to 3D printing, slicers such as Cura and PrusaSlicer, and CNC.
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 OBJ to STL in Python?
Use trimesh: trimesh.load('input.obj').export('output.stl'). If you just need the file, this converter does it in the browser without writing any code.
OBJ ko STL kaise kare?
Is page par "Choose files" dabaiye, apni OBJ file chuniye aur "Convert to STL" par click kijiye. STL file turant download ho jaati hai. Ye bilkul free hai, sign-up nahi chahiye, aur aapki file kisi server par upload nahi hoti.
OBJ vs STL: format comparison
| OBJ | STL | |
|---|---|---|
| Full name | Wavefront OBJ | Stereolithography |
| Type | Text-based 3D mesh | 3D printing mesh |
| Created by | Wavefront Technologies, 1980s | 3D Systems, 1987 |
| Compression | None (text) | Binary or ASCII triangles |
| File extension | .obj | .stl |
| MIME type | model/obj | model/stl |
| Best for | Exchanging meshes between Blender, Maya, 3ds Max, ZBrush and game engines | 3D printing, slicers such as Cura and PrusaSlicer, and CNC |
| Opens in | Blender, Maya, 3ds Max, Cinema 4D, Unity, Windows 3D Viewer | Cura, PrusaSlicer, Bambu Studio, Fusion 360, Tinkercad and Blender |
What is a OBJ file?
OBJ is a simple text format for 3D geometry developed by Wavefront Technologies. Vertices, normals, texture coordinates and faces are written line by line, so virtually every 3D program can import it.
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.
Need it the other way round? Use the STL to OBJ Converter.
More OBJ converters
Convert other formats to STL
Related searches
All tools on News Appite are free to use for personal and commercial work. Calculations and file conversions are performed in your browser; the redirect and cache checkers make a single request to the URL you enter and store nothing. Found a bug or want a new tool? Tell us.