STL Viewer is a free tool. Upload an STL, OBJ, 3MF, GLB or PLY file to this STL viewer, rotate and zoom the model, and check its size; no sign-up, runs in your browser.
Runs in your browser · your file is not uploaded · no sign-in needed
Configure your options
Your 3D Model Will Appear Here
Fill in the options on the left, then press the button. The work is done in your browser.
Relevant internal links based on this tool
Upload your image
Drag & drop your file here or click to browse
An STL viewer opens a 3D file so you can look at its shape, rotate it and check basic details before printing or sharing it. It suits anyone who received a model file and wants to inspect it without installing software. Upload an STL, OBJ, 3MF, GLB or PLY file, then rotate, zoom and read the size, triangle count and watertight status. It runs fully in your browser, so no sign-up and no credits are used.
Use the Upload a 3D File field to add an STL, OBJ, 3MF, GLB or PLY file from your device, ready for a closer look before you print or share it.
Drag to rotate the model and scroll to zoom in, checking edges, thin walls or gaps that might cause printing problems later.
Check the reported size in millimeters, triangle count and whether the mesh is watertight, which tells you if it is sealed enough to print.
Opening a model before slicing lets you confirm the size in millimeters and spot obvious problems like missing sections, saving a wasted print if something looks wrong.
If a friend or client sends an STL, OBJ or GLB file, viewing it here lets you check the shape without installing 3D software just to look at one file.
A model that is not watertight has gaps in its surface, which can cause slicing errors, so checking this status before printing tells you whether the file needs repair first.
It opens STL, OBJ, 3MF, GLB and PLY files, letting you rotate and zoom the model and read its size in millimeters, triangle count and watertight status.
No. It runs fully in your browser, so no account is needed and no credits are used, and the file is never uploaded to a server.
No. Colors and textures are not shown, so even if your GLB file has color data, you will only see the shape here.
A watertight mesh has a fully closed surface with no gaps or holes, which most slicers need to calculate a solid interior for printing without errors.
STL stores only the triangle mesh that defines a shape, while OBJ can also reference material and texture information, though both are widely supported by 3D printing and modeling software.
A large file usually has a high triangle count, and rendering many triangles in a browser depends on your device's memory and graphics performance, so very detailed models can feel slower to rotate.
Open a GLB file specifically if you want to see its color and texture.
Fix holes or flipped faces you noticed while viewing your model here.
Convert a 3MF file to STL if your slicer only reads STL files.
Make direct changes to the mesh instead of only viewing it.
Your file stays on your device. It is not uploaded.