Free Online STL Viewer
Open and view STL files online in seconds. This free STL file viewer renders your model in 3D right in your browser — no download, no account, and your file never leaves your computer. Rotate it, measure it, and get it 3D printed in one click.
Drag & drop your STL file here
or click to browse · STL, OBJ or 3MF · up to 100 MB · opens instantly, nothing is uploaded
How to view an STL file online
- 1
Open your file
Drag an STL, OBJ or 3MF into the viewer above, or click to browse. It opens instantly — nothing is uploaded.
- 2
Rotate, zoom and measure
Drag to rotate, scroll or pinch to zoom, right-click to pan. Width, depth and height are shown in mm and inches.
- 3
Print, repair or move on
Happy with it? Get an instant print quote. Something looks wrong? Run it through the free STL repair tool.
One online 3D viewer for STL, 3MF and OBJ
No need for a separate STL file opener, 3MF viewer or OBJ viewer — the same tool opens all three common 3D printing formats, up to 100 MB.
STL viewer
Binary and ASCII STL — the standard 3D printing format. Binary STLs that store per-face colors are shown in color.
3MF viewer
3MF projects from Bambu Studio, PrusaSlicer, Cura and CAD tools. Every object on the build plate is shown in place.
OBJ viewer
Wavefront OBJ from Blender, ZBrush, Fusion 360 or a 3D scan. All mesh parts are combined into one preview.
What to check before you print
A quick look in the STL viewer catches the problems that waste the most filament — before the file ever reaches your slicer.
Real-world size
Confirm a model is the size you expect before printing — a common surprise is an STL exported in inches or centimetres that shows up 25× too small.
Details and orientation
Spin the model to check thin features, overhangs and which face should sit on the print bed.
Volume and triangle count
See the mesh's triangle count and approximate volume — a quick sense of how heavy (and how expensive) the print will be.
Signs of a broken mesh
Missing walls, holes or dark inside-out patches mean non-manifold edges or flipped normals — fix them with the STL repair tool.
Model looks broken? The viewer shows problems; it doesn't change your file. Use thefree STL repair tool to fill holes, fix non-manifold edges and flipped normals, and download a watertight STL.
STL viewer FAQ
Is this STL viewer free?
Yes. The viewer is completely free, with no sign-up, no file limit per day and no watermark.
Is my file uploaded when I view it?
No. Your model is opened and rendered entirely in your browser, so it never leaves your computer. It is only uploaded if you click “Get an instant print quote”.
How do I open an STL file without installing software?
Drag the STL file into the viewer on this page, or click the upload area and choose it. Any modern browser with WebGL works — Chrome, Edge, Firefox or Safari, on Windows, Mac, Linux or ChromeOS.
Can I view STL files on my phone?
Yes. The viewer works in mobile browsers on iPhone, iPad and Android: tap the upload area, pick the file, then use one finger to rotate and pinch to zoom.
Which file formats can I open?
STL (binary and ASCII), 3MF and OBJ files up to 100 MB. Very large models can take a few seconds to open on slower devices.
How do I measure my STL file?
After the model opens, the viewer shows its width, depth and height in millimetres and inches, plus the triangle count and an approximate volume. STL files have no units, so sizes assume millimetres — the convention used by slicers.
Why does my model look inside-out or have holes?
That usually means flipped normals, open edges or non-manifold geometry. Upload the file to our free STL repair tool to fix it and download a watertight STL.
Can you 3D print my STL file?
Yes. Click “Get an instant print quote” after the model opens. You choose PLA, PETG or TPU, the color and the size, and see the price right away — then we print it and ship it to you.
Need it printed?
Upload your model for an instant 3D printing quote — PLA, PETG and TPU, printed on a Bambu Lab H2C in Los Angeles and shipped to you.
Get a 3D printing quote →STL won't slice?
Fix holes, non-manifold edges and flipped normals online, then download a watertight STL that slices cleanly in any slicer.
Repair an STL file free