Convert STL to GLB, OBJ, PDF (Free)
No upload, no signup, no software to install
Why Convert STL Files?
Used by every 3D printer slicer (Cura, PrusaSlicer, Bambu Studio), CNC operators, FEA simulation tools (Ansys, COMSOL), and 3D printing services (Shapeways, Xometry). Practically every CAD package exports STL.
Converting to a more widely supported format means your model can open in any 3D tool, slicer, web viewer, or AR app — without asking the recipient to install specialized software.
How to Convert a STL File
- 1
Open your STL file
Click "Open a STL File" above, or drag and drop your .stl file onto the converter.
- 2
Choose an output format
Click the "Export" button in the toolbar and select GLB, OBJ, PDF.
- 3
Download the converted file
Your file downloads instantly. Everything runs in your browser — nothing is uploaded.
Output Formats
STL to GLB (glTF Binary)
Universal 3D format. Open in Blender, Unity, Unreal Engine, web viewers, AR/VR apps, and Google’s model-viewer. Materials, textures, and PBR survive the round trip.
STL to OBJ (Wavefront)
One of the most universally supported 3D formats. Import into 3ds Max, Maya, Rhino, Cinema 4D, MeshLab, or virtually any 3D application.
STL to PDF (Snapshot)
Export the current camera view as a one-page PDF with header and footer captions — ideal for presentations, submittals, and email handoffs.
Compatibility & Format Notes
Both binary and ASCII STL files are supported. The viewer auto-detects which variant a file uses. There are no version differences for STL beyond binary vs ASCII — the format has been stable since 1987.
Your Files Stay on Your Computer
Both parsing and conversion run entirely in your browser. The exported files are generated locally and downloaded directly to your device — nothing is uploaded to any server.
Frequently Asked Questions
▶Does the viewer support binary AND ASCII STL?
Yes. The viewer sniffs the file’s magic bytes to pick the right parser automatically. You don’t need to know which variant your file uses.
▶Why is my STL all one color?
STL is a geometry-only format — it doesn’t carry materials or per-face colors. The viewer renders all triangles in a default neutral gray. If you need color, convert your source model to GLB or OBJ instead, which can preserve material data.
▶How big an STL can I open?
The viewer can handle files into the hundreds of megabytes (millions of triangles) on a modern desktop. Very large files may be slow on phones — if a slicer can open it, this viewer almost certainly can too.
▶Can I convert STL to OBJ or GLB?
Yes. Click Export in the toolbar and choose OBJ (Wavefront) or GLB (glTF binary). The converted file downloads directly.
▶Is this STL viewer really free?
Yes, completely free. No signup, no watermarks, no file size limits on the viewer (the optional share-link feature has a 30 MB upload cap). Built by Innerscene as a tool for architects, engineers, and designers.
▶Are my files uploaded to a server?
No. All parsing, rendering, and conversion runs in your browser — nothing is uploaded, stored, or transmitted by default. The Share button is the only feature that uploads a file, and only when you explicitly click it.
▶Can I convert to another format?
Yes. Click Export in the toolbar to save as STL (3D printing), OBJ (Wavefront), GLB (glTF binary), or PDF (snapshot of the current view).
▶Can I embed this viewer on my own site?
Yes. Click Embed in the toolbar to generate a one-line <iframe> snippet you can paste into any HTML page. You can choose whether the embed shows the viewer’s toolbar.