Free Online OBJ Viewer
This viewer opens Wavefront OBJ files directly in your browser: drop a .obj file onto the page and the mesh appears in an interactive 3D viewport with orbit, zoom and pan. Parsing happens locally with three.js, so even a 300MB model is never uploaded anywhere.
OBJ geometry usually travels with a companion .mtl material file and a folder of texture images. Select those files together and the materials are applied; open the .obj on its own and you still get the complete geometry, shaded with a neutral default material.
Select the model together with its material, texture and binary files. Files stay in this browser.
AO mode displays authored occlusion maps; white means none is supplied. This is not real-time ambient occlusion.
- Vertices
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- Triangles
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- Materials
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- Dimensions
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How it works
Add your OBJ file
Drag a .obj file onto the drop zone or click to browse. If you have the matching .mtl file and its texture images, select them in the same step so the materials resolve instead of falling back to grey.
Orbit and inspect the mesh
Left-drag to rotate, scroll to zoom, right-drag to pan; auto-fit frames the model on load. The shading menu switches between textured, wireframe, normal, UV checker and six more modes, which is how you spot flipped normals or stretched UVs.
Read the numbers, then convert if needed
The info panel reports file size, vertex count, triangle count, materials and the exact bounding-box dimensions. If a downstream tool wants another format, hand the same file to the OBJ to STL or OBJ to GLB converter.
Nothing is uploaded
OBJ parsing and rendering both happen inside the tab. There is no upload step, no server-side copy and no retention window: closing the tab ends the session.
Up to 500MB, rendered locally
The viewer accepts OBJ files up to 500MB and starts drawing as soon as the text is parsed. Real-world speed depends on your device's memory, because OBJ is ASCII and a dense mesh can be hundreds of megabytes of numbers.
MTL materials and textures
Add the companion .mtl file and its images and the viewer applies base colours and diffuse maps. MTL predates physically based shading, so PBR-only parameters are approximated rather than guessed.
Ten shading modes
Textured, wireframe, unlit, normal, matcap, ambient occlusion, depth, UV checker, diffuse-only and X-ray. Switch modes to judge normals, UV layout and triangle flow instead of only the silhouette.
Mesh statistics and viewport controls
Vertex count, triangle count, material count and bounding-box dimensions, plus a grid toggle, auto-rotate turntable, camera reset, fullscreen and a PNG snapshot of the current view.
What Is a OBJ File?
OBJ is the plain-text geometry format published by Wavefront in the early 1990s. Vertex positions are written with v, texture coordinates with vt, normals with vn and faces with f; o and g lines split a file into named objects and groups, and s controls smoothing groups.
Materials live outside the file. An mtllib line points at a .mtl file that names each material together with its maps, and the texture images themselves are separate files too. That is why an OBJ is really a small bundle, and why an OBJ that arrives on its own so often looks untextured.
The format records no units and no animation, and because it is text a dense mesh is several times larger than the same geometry in GLB. Every DCC tool, slicer and engine still reads it, which keeps OBJ useful as the lowest-common-denominator exchange format.
Advantages
- Readable and editable in any text editor
- Materials and texture maps via a companion MTL file
- Separate objects, groups and smoothing groups
- Accepted by essentially every DCC tool, slicer and engine
Disadvantages
- Needs the MTL and texture files to look right
- ASCII text makes dense meshes several times larger than GLB
- No units, no animation and no scene graph
- Free-form curves and surfaces (curv, surf, vp) are ignored by most loaders
Who Uses This OBJ Viewer?
3D printing hobbyists
You downloaded an OBJ from a model site and want to see what it actually looks like before slicing it. Check the shape here, then convert to STL for the printer.
Game artists and prop modellers
Verify an export from Blender, Maya or 3ds Max before it goes into Unity or Unreal: orientation, scale, flipped normals and UV layout are all visible in a couple of clicks.
Product and furniture designers
A client sent an OBJ and you need the proportions without opening a full DCC suite. The bounding-box numbers answer most questions immediately.
Architects and interior visualisers
Review SketchUp or Rhino OBJ exports on a laptop, in a browser tab, with the same materials the exporter wrote.
Students and teachers
Open coursework on a Chromebook or a locked-down lab machine where nothing can be installed.
Asset buyers
Inspect a purchased model before importing it into a pipeline, and confirm it is the mesh you paid for rather than a preview render.
Frequently Asked Questions
What is an OBJ viewer, and what does this one do?
It parses a Wavefront OBJ file and draws the mesh in an interactive 3D viewport so you can rotate, zoom, pan and inspect it. This viewer runs entirely in your browser with a three.js OBJLoader, reports vertex and triangle counts plus bounding-box dimensions, and offers ten shading modes. It is a viewer, not an editor: nothing is modified or exported here.
How do I open an .obj file online?
Drag the .obj file onto the drop zone or click to browse. If you also have the .mtl material file and its texture images, select them at the same time so materials resolve. The model appears as soon as the text has been parsed; there is no upload, no queue and no sign-up.
Is my OBJ file uploaded to a server?
No. The file is read locally by the browser and never leaves your device, which is why the viewer can accept files up to 500MB without a bandwidth cost. The only time anything is uploaded is if you deliberately use a converter afterwards, where the same file goes to the server-side pipeline with a 50MB limit.
Why does my OBJ look grey with no textures?
An OBJ only stores geometry: the colours live in the .mtl file it references on its mtllib line, and the maps live in separate image files. If you selected only the .obj, there is nothing to apply and the viewer shades the mesh with a neutral default material. Add the .mtl and the images it names and the surfaces appear, or convert the asset to GLB, which packs everything into one file.
Does the viewer support .mtl files and texture maps?
Yes. Select the .mtl file together with the .obj and the viewer reads base colours (Kd) and diffuse maps (map_Kd). MTL was designed before physically based rendering, so specular and shininess values are approximated with a simple lit material; the geometry and UVs are unaffected.
What is the maximum OBJ file size?
The viewer accepts files up to 500MB, and nothing is uploaded, so the practical ceiling is your device's available memory. OBJ is ASCII text, so parsing is slower and heavier than a binary format of the same complexity: if a 400MB OBJ feels sluggish, converting it to GLB once will make every later open much faster.
Can I check UVs, normals and triangle flow in this viewer?
Yes. The UV checker shading mode replaces the albedo with a procedural checker so you can see UV scale and stretching; normal shading shows interpolated normals; wireframe shows triangle density and flow; X-ray reveals internal geometry. If a file contains no vn normals the renderer computes them so the surface still shades sensibly.
Which OBJ features does the viewer not support?
Free-form geometry is the main one: curv, surf, vp and other NURBS-style statements are skipped, because OBJ loaders in browsers handle polygon faces only. Quads and n-gons are triangulated on load, animation does not exist in the format, and no unit is recorded, so the numbers you see are in whatever unit the exporter assumed.
Can I convert the OBJ after viewing it?
Yes. Converters such as OBJ to STL, OBJ to GLB, OBJ to FBX, OBJ to PLY, OBJ to 3MF and OBJ to USDZ accept the same file. Those run server-side with a 50MB limit per file, keep the geometry, and carry materials where the target format supports them: STL drops colour and materials entirely, while glTF-based outputs keep them.
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