MPO Viewer

MPO Viewer

3D Stereo Photo & Video Viewer

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Free
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Released
August 19, 2026
Updated
October 5, 2026

Features

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About

MPO Viewer opens your stereoscopic 3D photos and video straight from the camera. No conversion, no computer. A dual-lens camera such as the Fujifilm FinePix REAL 3D W1 or W3 saves each photo as an .mpo file holding both eyes, and MPO Viewer shows that pair in six 3D modes and plays the stereo video those cameras shoot. VIEWING Point it at a folder of .mpo photos or .avi clips, on your device or in iCloud Drive, and browse a searchable grid or table. Open any photo in the mode that suits you: • Side by Side: the classic pair, for free-viewing or a stereo viewer • Crossed Eye: the same pair swapped, for cross-eyed viewing • Cardboard (experimental): the pair bent beforehand so the lenses of a cheap VR viewer straighten it out again, set to your own viewer • Anaglyph: both eyes merged for coloured glasses (Red/Cyan, Magenta/Green, Amber/Blue or Red/Blue), with eye swapping and ghost reduction • Wiggle: the two eyes flicker back and forth, on a timer or as you tilt the phone • Depth (experimental): a depth map built from the pair, warped as you tilt Stereo clips play with sound in Side by Side, Crossed Eye, Cardboard and Anaglyph. Whichever mode you pick, the pair is corrected first: the eyes are brought into line vertically and the nearest thing placed at the screen plane, which is what keeps the depth comfortable. Hide a photo or clip and the Hidden list brings it back, behind Face ID if you want. An info button shows what the camera recorded, down to lens, aperture, shutter and ISO, with a map when there is a location. WATCHING TOGETHER A few red/cyan glasses and a television make a stereo evening for the whole room. Mirror to an Apple TV or AirPlay television, or plug in HDMI: the picture moves to the big screen and the phone becomes the remote. Swipe, run a slideshow, play a clip with sound. Set the depth once per television and every photo is placed for that screen from then on. STEREO CARDS AND READY MADE PAIRS Old stereo cards become MPOs too, from any mount or an archive scan. Convert a photo of a card and the two prints are found by their edges, straightened and registered on each other, with the colour cast of the lamp taken out. Every card then carries three buttons of its own: turn it over, put the light back, or save it without colour. Or photograph one in the app, inside the frame it draws. A converted card can be coloured by a machine learning model on the device. The card itself is never touched. A picture that already holds the pair side by side goes in the same way. The app works out which of the two it has, finds the two panels and writes the MPO. Each row says what it decided; one button overrules it either way, another swaps the eyes, and one more cuts a picture down the middle on your word. FRAMES, SLIDESHOWS AND PLAYLISTS Frame photos and clips with a plain border in a colour of your choosing, or one of six passepartouts, from a stereo card to a cardboard peep box. Caption any photo; the caption takes a colour of its own. Run a slideshow through a folder, or save a selection as a playlist: the library then shows just that list, in your order, from the start or shuffled. SHARE AND EXPORT Side by Side, Crossed Eye and Anaglyph export as PNG or JPEG, Wiggle as an animated GIF or a cross-faded video, Depth as an MP4 tilt-sweep. Cardboard exports the plain pair. A clip exports as MP4 at three sizes, with or without its sound. Exports carry a watermark; MPO Viewer Pro removes it. ACCESSIBILITY Works with VoiceOver, the largest text sizes and Reduce Motion, where Wiggle and Depth follow your tilt instead of moving by themselves. Both work with one eye. PRIVACY Your photos never leave your device. No accounts, no analytics, no data collection. The one thing the app ever fetches is a larger colour model, only when you ask. In English and Dutch, for anyone rediscovering a box of old stereo photos and anyone still shooting 3D.
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What's New in MPO Viewer

1.14

October 5, 2026

• Cardboard upright: pinch to look closer. Upright there is no viewer to look through, so Cardboard shows the photograph whole and unbent and asks you to turn the phone. Now you can pinch in and drag around there as well, to look at something closely without leaving the mode. • Cardboard's bend follows the slider. Setting how far the picture is bent used to mean dragging, letting go, and waiting to see what you had done. It redraws while you drag now, so you can set it by eye through the viewer instead of by guessing. • The viewer stops caring how big your folder is. Moving a slider under the picture, or swiping on to the next photograph, used to get slower the more photos you had: with a few thousand the picture stalled for a quarter of a second at a time. The viewer now keeps a handful of photographs to hand instead of the whole folder, so a large folder behaves like a small one. • The depth in Anaglyph follows the slider too. Sliding the two eyes apart or together is how you place the depth of a photograph, and until now the picture only changed once you let go, which made it a matter of try, wait and try again. It moves with your finger now. • A quicker grid, if you want one. Cameras write a small picture into every photograph they take, and this app now writes one into every card it converts. Reading that one instead of the whole photograph fills the grid many times faster, which you notice in a folder of thousands. It is smaller, so it is a little softer. The choice is yours, under Settings, Library, Thumbnails; sharp is how it stays until you say otherwise. • A way back to the beginning. Settings, General now ends with Reset All Settings, which puts every setting back to how the app opens on a new phone. Your photographs, their captions, the hidden list, the cards you turned over, your playlists and the screens you calibrated are not touched. • A long caption shrinks instead of losing its tail. A decorative passepartout only has room for about a line and a half at full size, and whatever did not fit was lost without a sign: on screen it was cut straight through the last line, and in an exported card the tail of the title simply went missing. The caption now shrinks until the whole title fits, and only ends in an ellipsis if it still does not. Screen and export do it the same way. • The headings in Settings follow a change of language. The language choice lives in Settings itself, and anyone switching language there saw the heading of that page, and the back button with it, stay in the old language until they went somewhere else. They change over straight away now.

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Subscriptions & In-App Purchases

$4.99

MPO Viewer Pro

Remove the watermark from exported photos and videos.