# A Windows 3D Viewer alternative that needs no install

> Microsoft has deprecated 3D Viewer and stopped new downloads. Open the same STL, 3MF, GLB, glTF, OBJ, PLY and FBX files in your browser instead — plus STEP, USDZ and 3DM. Free, no install, no upload.

Source: https://freestlviewer.com/windows-3d-viewer-alternative/  
Updated: October 22, 2026

Microsoft's 3D Viewer can no longer be downloaded. Open the same files — and STEP, USDZ and Rhino 3DM too — right here in Edge or Chrome. Nothing is installed or uploaded. The tool is interactive: open https://freestlviewer.com/windows-3d-viewer-alternative/ and drop a file onto the page.

## What happened to 3D Viewer

3D Viewer (first released as Mixed Reality Viewer in 2017) was the built-in
Windows app for opening 3D files with a double-click. Microsoft has since moved it to its list of
deprecated Windows features, and from July 2026 it can no longer be downloaded
from the Microsoft Store. Installed copies keep working, but they are frozen:
no updates, no fixes, and new PCs do not get it.

So on a fresh Windows 11 machine, double-clicking an `.stl` or `.glb` now asks
which app to use. Microsoft's own guidance points to the web-based Babylon.js
Sandbox, which is aimed mainly at glTF scenes.

## The browser option: same files, nothing to install

Mes3D runs in Edge, Chrome or Firefox on any Windows PC. Drop a file on this
page and it opens full screen.

| Format | 3D Viewer | Mes3D in the browser |
| --- | --- | --- |
| STL (binary and ASCII) | Yes | Yes |
| 3MF | Yes | Yes, including Bambu Studio and OrcaSlicer projects |
| GLB / glTF | Yes | Yes (a .gltf with its .bin and textures from a folder or ZIP) |
| OBJ | Yes | Yes, with .mtl materials and textures |
| PLY | Yes | Yes |
| FBX | Yes | Yes |
| STEP / STP (CAD) | No | Yes, converted on your PC with OpenCASCADE |
| USDZ / USD | No | Yes |
| 3DM (Rhino) | No | Yes |
| DAE, 3DS, AMF, OFF, ABC | No | Yes |
| Animation playback, lighting effects | Yes | No |
| Works offline after first load | Yes | Yes |
| Install needed | Was built in | No |

3D Viewer had a mixed-reality mode and played FBX and glTF animations;
Mes3D does not. What it adds is aimed at printing and CAD users: STEP files,
point-to-point measurements in millimetres, and print checks such as volume,
weight, watertightness and overhangs.

## Make it feel like an app

You cannot make a website the default app for a file type, but you can get
close:

1. **Edge:** open this page, then **⋯ → Apps → Install this site as an app**.
   Mes3D gets its own window, Start-menu entry and taskbar icon.
2. **Chrome:** **⋮ → Cast, save and share → Install page as app** (or **More
   tools → Create shortcut… → Open as window** on older versions).
3. Drag files from File Explorer straight into that window.

Because everything runs locally, the window keeps working without an internet
connection once it has loaded.

## If you want an installed program

Being honest about the alternatives:

- **Slicers** — PrusaSlicer, OrcaSlicer, Bambu Studio and Cura all open STL,
  3MF and OBJ, and can be set as the default app for `.stl`. Best if you print.
- **Blender** — opens nearly every format and lets you edit, but it is a large
  install and a heavy tool just to look at a file.
- **F3D** — a small, fast, open-source desktop viewer that can be the default
  app for many 3D formats.

Mes3D's niche is the case where you just want to see a file now, on any
machine — a work PC without admin rights, a borrowed laptop — without
installing anything or uploading the file.

## What you can do once it is open

- Rotate, zoom and pan with the mouse; snap to front, top and side views.
- Switch between perspective and orthographic projection, or wireframe.
- Read the bounding-box width, height and depth in millimetres.
- Click two points to measure the distance between them.
- Open the analysis panel for volume, surface area, estimated print weight,
  watertightness and overhangs.
- Save a PNG snapshot of the current view.

## On your phone

The same viewer works in a phone browser for viewing and dimensions. For
measuring, analysis, cross-sections and AR on the phone itself, the Mes3D app is
available for iPhone, iPad and Android.

## Frequently asked questions

### Is Microsoft 3D Viewer discontinued?

Yes. Microsoft added 3D Viewer to its list of deprecated Windows features and stopped new downloads from the Microsoft Store in July 2026. Copies that are already installed keep working but receive no further updates.

### What can I use instead of 3D Viewer on Windows 11?

For quick viewing without installing anything, a browser-based viewer such as Mes3D opens STL, 3MF, GLB, glTF, OBJ, PLY and FBX — the formats 3D Viewer handled — plus STEP, USDZ and Rhino 3DM. If you want an installed program, slicers like PrusaSlicer, OrcaSlicer or Cura open printing formats, Blender opens almost everything, and F3D is a small open-source desktop viewer.

### Can I make STL files open with a double-click again?

A website cannot register itself as the default app for .stl files. Pinning Mes3D as a browser app gives you a one-click window to drop files into; for true double-click opening, set an installed program such as a slicer as the default for .stl under Settings > Apps > Default apps.

### Does the browser viewer upload my files?

No. Files are read and rendered by your browser on your own PC. Nothing is sent to a server, so it works for confidential models and keeps working offline once the page has loaded.