What files can I open?

Equirectangular panoramas: a 2:1 image for 360 degrees, or 1:1 for VR180. If the image is twice as tall as it is wide it is treated as a top-and-bottom stereo pair and each eye is sampled from its own half.

No. Drag with the mouse or a finger to look around, and tick the red/cyan option to see the depth with paper glasses. With a WebXR headset the Enter VR button appears and each eye gets its own view.

Is the image uploaded?

No. The panorama is decoded into a texture inside the tab and never leaves the device.

DepthSnap/ Tools / 360 viewer

Look around a panorama — on screen or in VR

Drop a 360 or VR180 image and look around it. Drag with the mouse or a finger; if you have a headset, the same image opens in VR with one view per eye. Nothing is uploaded and nothing is installed.

Drop a 360 (2:1) or VR180 (1:1) panorama here, or click to choose a file

Layout Projection red / cyan preview drag to look · scroll to zoom

No file yet. Nothing leaves your device.

What it does with a stereo panorama

A stereo panorama stores both eyes in one frame — usually stacked, left eye on top. This viewer samples each eye from its own half instead of showing you one flattened image, which is the difference between “looking at a 360 photo” and “standing in the scene”.

One shape is ambiguous: a 1:1 image can be a 360 stereo pair (two 2:1 eyes stacked) or a single VR180 photo. The Layout and Projection menus keep that decision explicit, and the status line always says which reading is in effect.

On a normal screen you get a monoscopic view plus the option of a red/cyan composite for paper glasses. In VR the two halves are drawn to the two eyes separately, so no glasses are needed and the depth is the one that was rendered into the file.

Putting your own panorama in here

Flat 360 photo, no depth? Run it through the 360 to 3D tool first — it estimates depth and writes a top-and-bottom stereo file.
Bring that file back here, tick nothing, drag to check it looks right.
With a headset connected, press Enter VR. The page asks the browser for an immersive session; if the browser has no headset attached the button stays disabled and says so rather than failing silently.

Limits, stated plainly

WebXR needs a headset browser. Desktop Chrome shows the viewer but not the VR button unless a headset is connected; iOS Safari does not expose WebXR at all. The on-screen view works everywhere.
Equirectangular only. Cubemaps, fisheye pairs and 3D Blu-ray framings are different projections — this viewer would show them distorted.
No spatial audio, no hotspots, no video. It is a viewer for still panoramas, not a 360 player.
Stereo is detected by shape. A twice-as-tall image is treated as top-and-bottom; a single tall panorama would be misread, so keep the aspect ratio honest.

Why does the picture look distorted near the top and bottom?

That is the equirectangular projection, not a bug: the poles are stretched across a whole row of the image. Every 360 viewer does the same thing; the scene only looks natural where you are actually looking.

Can I use this on a phone without a headset?

Yes — drag with a finger. Holding the phone up and moving it around is not implemented, because that needs device-orientation permission and it is a bigger change than a viewer should need.

DepthSnap — free browser-based 2D to 3D SBS converter. No upload, no signup, no watermark.