Then tap "View in AR" in the toolbar to place it in your room
AR on iPhone + Android No app download Real-world scale Free

View STL Files in Augmented Reality

Open any 3D file, tap "View in AR," and see it in your room at real-world scale. Works on iPhone and Android — no app download needed.

Checking the size of a 3D print before printing is hard. Slicers show you dimensions in millimeters, but it's almost impossible to visualize 127mm × 84mm × 52mm in your head. Is that too big for the shelf? Will it fit inside the box? You won't know until you print it.

GeometryViewer solves this with AR. Open your STL file in the viewer above, tap "View in AR" on your phone, and the model appears in your room — at exactly the size it will print. Walk around it. Put your hand next to it. Know the size before you waste filament.

How AR works on each platform

Different technology, same result — your model in your room.

iPhone (iOS)

Uses Apple Quick Look — Apple's built-in AR engine. GeometryViewer converts your model to USDZ format on the fly, then hands it to Quick Look. The AR experience is native iOS quality.

  • iPhone 6S or newer
  • iOS 12 or later
  • Safari browser
  • No app download — Quick Look is built into iOS

Android

Uses WebXR via Google's ARCore. The model is placed directly in your space from Chrome — no separate app needed. Real-time lighting matches your environment.

  • ARCore-compatible device (most phones 2019+)
  • Chrome browser
  • Google Play Services for AR (usually pre-installed)
  • No additional app download needed

How to view your STL in AR

Three taps. Works on the viewer above or at geometryviewer.com.

1

Open your file

On your phone, go to geometryviewer.com and open your STL, OBJ, GLB, GLTF, or 3MF file. Tap the open button or use the share sheet from your file manager.

2

Tap "View in AR"

In the viewer toolbar, tap the AR button. On iPhone, Quick Look opens automatically. On Android, you'll see a prompt to place the model.

3

Place it in your room

Point your camera at a flat surface (table, floor, shelf). The model appears at real-world scale. Walk around it, compare it to objects nearby, check if it fits where you want it.

Why view 3D models in AR?

Check print size

See if your 3D print fits on the shelf, desk, or in the box before you print it. No more "I thought it would be smaller" moments.

Show clients

Share a link. Your client opens it on their phone and sees the product in their space. Better than any rendering or photo.

Teach with 3D

Students can hold their phone up and see a molecule, machine part, or architectural model floating on their desk. No VR headset, no app, just a browser.

Product photography

Place your 3D model on a real table, real shelf, real desk — then screenshot. Instant product photos with real-world context.

Frequently asked questions

Can I view STL files in AR without downloading an app?

Yes. GeometryViewer runs in your browser. On iPhone it uses Apple Quick Look (built into iOS), on Android it uses WebXR (built into Chrome). No app download on either platform.

Does the AR view show the model at real-world scale?

Yes. The model appears at 1:1 scale based on the dimensions in your file. If your STL is 150mm tall, it appears 150mm tall in AR. Perfect for checking 3D print size.

Which iPhones support AR?

iPhone 6S and newer running iOS 12 or later. That covers every iPhone sold since 2015. Open the link in Safari — Quick Look is built in.

Which Android phones support AR?

Any ARCore-compatible Android device — that's most phones from 2019 onward, including Samsung Galaxy, Pixel, OnePlus, Xiaomi, and others. Check the full list at developers.google.com/ar/devices.

What file formats work with AR?

All formats GeometryViewer supports: STL, OBJ, GLTF, GLB, and 3MF. The viewer handles conversion automatically — just open your file and tap the AR button.

Can I share an AR link with someone?

Yes. Upload your model, get a shareable link. When the recipient opens it on their phone and taps View in AR, they see the model in their own room. No account needed.

See it in your room

Open an STL file on the viewer above, then tap "View in AR" on your phone.

Open GeometryViewer

Also see: 3D Print Preview — simulate layer lines and materials before printing. Or STL Viewer for general STL viewing.