Convert MOS to APNG Online

Convert MOS to APNG Online

Turn a sequence of Leaf MOS medium-format RAW captures into one animated PNG: upload your MOS files in shooting order, pick a frame rate, and download a single looping APNG. MOS is the Mamiya RAW format written by Leaf Aptus, Aptus-II, and Credo digital backs, so each file is demosaiced and rendered to an 8-bit sRGB frame on conversion. Upload one MOS and you get a clean one-frame APNG; upload several and each becomes a frame, which is ideal for studio timelapses, product turntables, or stop-motion shot on a Mamiya back.

How to Convert MOS to APNG

1. Upload Your MOS Files: Drag and drop or click "Add Files" to add your Leaf MOS captures. They become frames in the order you add them, so arrange the sequence before converting.
2. Set the Frame Rate: Pick a value from the FRAMERATE dropdown — 10 FPS (Recommended) for a smooth loop, or a lower rate for a slow timelapse and a higher one to speed the sequence up.
3. Adjust Image Quality, Resolution, or Colors (Optional): Lower Image Quality (%) or set a Preset Resolution / Width x Height to shrink large medium-format frames, and use Colors to keep the original palette or reduce colors with dithering for a smaller file.
4. Convert and Download: Click Convert and save your APNG. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.

APNG vs GIF for MOS Photo Frames

Frequently Asked Questions

How do I combine multiple MOS files into one animated APNG?

Add every MOS capture you want as a frame before you convert — the upload order is the playback order. Each file becomes one frame, and the FRAMERATE setting controls how long each frame is shown. A single uploaded MOS produces a valid one-frame (static) APNG, so this tool works as both a sequence animator and a plain MOS-to-PNG renderer.

Why pick APNG over GIF for medium-format frames?

Leaf and Mamiya backs capture wide-gamut, full-color images, and GIF caps every frame at 256 colors, which crushes skin tones, skies, and product gradients into visible banding. APNG stores full 24-bit color losslessly, so the rendered frames keep the smooth tonality the digital back recorded. In our testing, a 3-frame sequence rendered from MOS produced an APNG with no posterization, where the equivalent GIF showed dithering across smooth backgrounds.

Will I lose detail converting MOS RAW to APNG?

MOS is a high-bit-depth RAW container, and the converter demosaics it to an 8-bit sRGB frame, which is the same depth a JPEG or web PNG uses — so you keep full visible detail but not the RAW editing latitude. The APNG container itself is lossless and does not re-compress your frames unless you lower the Image Quality (%) slider. If you need to keep RAW editing headroom, render a high-bit still with MOS to TIFF instead.

Why are my MOS frames so large, and how do I shrink the APNG?

A single Leaf MOS file can be tens of megabytes (uncompressed captures run well over 100 MB), and a 56-megapixel frame is far larger than any web animation needs. Use the Preset Resolution or Width x Height controls to downscale every frame to a sensible pixel size, and lower Image Quality (%) or reduce Colors to bring the final APNG down further.

Which browsers and apps play APNG files?

Chrome 59+, Firefox 3+, Safari 8+, Edge 79+, and current Opera play APNG natively — about 94.7% of users worldwide per caniuse. In an app or older browser that does not support it (such as Internet Explorer), the file falls back to showing its first frame as a normal still PNG, so your sequence never appears broken.

Do I need to render each MOS to JPG or PNG first?

No. Upload the MOS files directly — the converter renders each RAW frame for you, so there is no separate export step. If you only want a single still rather than an animation, MOS to JPG gives you one rendered photo per file.