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Need help?MOS to 3GP Converter
A .mos file is a Leaf Camera RAW still — the high-bit-depth sensor data captured by Leaf Aptus and Leaf Valeo medium-format digital backs. 3GP is the low-bandwidth mobile-phone video container defined by 3GPP. Converting MOS to 3GP wraps a single photograph into a short, silent video clip that simply displays that one image, which is useful when a device or app only accepts a 3GP video. If your goal is just to view or share the photo, converting MOS to a standard image like JPG or PNG is the better path — this page explains both formats so you can pick correctly.
MOS (Leaf Camera RAW) at a Glance
| Property | Value |
|---|---|
| Full name | Leaf Camera RAW image |
| Developed by | Leaf Imaging (Mamiya Leaf) |
| Type | Raw still image (one photo per file) |
| Used by | Leaf Aptus and Leaf Valeo medium-format digital backs |
| Bit depth | High-bit-depth sensor data (commonly 16-bit) |
| State | Undemosaiced raw sensor capture, not a finished picture |
| Typical size | Large — tens to ~100+ MB per frame |
| Opened by | Capture One, Leaf Capture, Adobe Camera Raw / Lightroom |
| Best for | Archiving and editing master captures with maximum tonal range |
3GP (3GPP Mobile Video) at a Glance
| Property | Value |
|---|---|
| Full name | 3GPP multimedia container |
| Standard | ISO/IEC 14496-12 base media format; spec ETSI TS 26.244 |
| Released | April 2003 (by the 3rd Generation Partnership Project) |
| Container | MPEG-4 Part 12 (ISO base media file format) |
| Video codecs | H.263, MPEG-4 Part 2, or H.264 (this tool defaults to H.264) |
| Audio codecs | AMR-NB / AMR-WB / AAC — none here, the output is silent |
| Designed for | Low-bandwidth 3G phones, small file size and resolution |
| Best for | Maximum compatibility with older and basic mobile devices |
How to Convert MOS to 3GP
- Upload Your MOS File: Drag and drop your
.mosfile or click "+ Add Files" to select it. You can queue several Leaf RAW files at once. - Choose Merge Strategy and Image Duration: Pick "Video per image" for a separate 3GP per photo, or "Merge images" to combine several into one clip, then set the "Image Duration" (how many seconds each frame is shown).
- Set Quality Preset, Background Color, and Resolution: Leave "Very High (Recommended)" for the best frame, keep the codec at H.264, and adjust the background color or video resolution if the clip will be padded.
- Convert and Download: Click "Convert" and download your 3GP. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. No sign-up, no watermark.
Frequently Asked Questions
Will I lose image quality converting MOS to 3GP?
Yes, and significantly. A MOS RAW holds high-bit-depth (commonly 16-bit) sensor data, while a 3GP video frame is 8-bit and low-resolution by design. The converter demosaics the raw capture down to a standard video frame, so the deep tonal range Leaf backs record cannot be preserved. For a faithful still, convert to JPG or PNG instead.
Does the 3GP file have sound?
No. A MOS file is a single photograph with no audio track, so the resulting 3GP is a silent video that displays that one image for the duration you choose. There is nothing to add an audio stream from.
Why would anyone convert a photo to a 3GP video?
3GP is the most widely supported container on older and basic mobile phones. Wrapping a single image into a short 3GP clip lets devices or apps that only accept video files display a still photo. It is a compatibility workaround, not a quality upgrade.
Is this an animation or a slideshow?
By default it is one still shown as a static clip. If you upload several MOS files and choose "Merge images," the tool can place them one after another with your chosen per-image duration, which produces a basic slideshow — still silent, and limited to 3GP's low resolution.
What software normally opens a Leaf MOS file?
MOS files are designed to be opened in Capture One, Leaf Capture, or Adobe Camera Raw / Lightroom, where the raw sensor data is demosaiced and developed. Camera Raw supports uncompressed MOS files; compressed Leaf MOS variants may need Capture One.
Should I convert MOS to 3GP or to a regular image?
For viewing, printing, or sharing a photo, choose a standard image format — MOS to JPG for a small shareable file or MOS to PNG for lossless quality. Only pick 3GP (or a more modern container like MP4) when something specifically requires a video file rather than an image.
What frame size should I pick so the 3GP plays on an old phone?
Keep the video resolution small. Older 3G handsets were built around tiny screens, so QCIF (176×144) and QVGA (320×240) were the common ceilings, and many basic players struggle above that. Set the video resolution to one of those small presets rather than leaving a medium-format Leaf frame at full size, or a legacy device may reject the file or play it back choppily. On a modern phone there is no such limit — but on a modern phone you would generally want MP4 or a plain image instead of 3GP.
Are my uploaded MOS files kept private?
Yes. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and your files are never shared or made public. In our testing, a single high-bit-depth Leaf MOS still converts to a 3GP clip in seconds once the upload completes — large RAW files mean upload time, not processing, is usually the longest step.