Free OBJ viewer for Android and Windows

Updated 16 October 2026 By the tool room at Saptasati Industries 3 min read

OBJ is one of the oldest and most widely shared 3D model formats: a plain-text list of points and faces, often with a companion .mtl file that gives each part its colour. Scanners, renderers and design tools all write it, so it is often the file you get when someone just wants to show you a shape.

What PartLens does with an OBJ file

• Objects and groups become parts in the parts list, so you can hide, isolate and inspect them one at a time.
• Colours are kept — from the .mtl file when it sits beside the .obj, and from per-vertex colours.
• Any polygon is handled, not just triangles, and the file's own smooth normals are used when it has them.
• PLY files (ASCII or binary) open too, with their colours; a scan with no faces shows as a point cloud you can snap to.
• Sections and approximate measurement (≈) work as they do on STL.

Open an OBJ file

1. Get PartLens free from Google Play or as a Windows download.
2. On Android: Tap the file in WhatsApp, Gmail, Drive or your file manager and choose PartLens under Open with, or open PartLens and tap Open.
3. On Windows: Install the free Windows app, then double-click the file, drag it onto the window, or use Open CAD….

Nothing is uploaded: the file is read on your device, with no account.

Honest limits

OBJ and PLY are meshes, so measurements on them are approximate (≈). Textured materials show their colour, not their image texture; for textured models, glTF or GLB keeps the texture. On a phone, colours from the .mtl are used when the .mtl can be found beside the model.

Frequently asked questions