SNB to MNG Converter

Free SNB to MNG animated image conversion

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Multi-Frame Pages

Turn your SNB ebook into an MNG file — a PNG-based animation format that can hold multiple pages in a single animated sequence.

Full Color Depth

Unlike GIF, MNG supports millions of colors and alpha transparency. Your converted ebook pages maintain full color fidelity.

Server-Side Engine

Conversion runs on Convertio infrastructure. Your device stays free from processing burden — just upload and download.

How to convert SNB to MNG

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose mng or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your mng file right afterwards

About formats

SNB is a proprietary ebook format developed by Shanghai Nutshell Electronics, a subsidiary of Shanda Interactive Entertainment, for the Bambook e-reader launched in August 2010. The format is structurally based on EPUB principles, packaging HTML content, CSS styling, images, and metadata within a compressed archive, but uses a proprietary container that restricts native playback to Bambook devices and associated software. Shanda designed the Bambook and its SNB ecosystem as an integrated reading platform tied to the Cloudary literature portal (later rebranded as China Literature), one of China's largest online publishing networks hosting millions of web novels and serialized fiction. The format supported reflowable text, chapter navigation, bookmarks, and basic typographic controls suited to Chinese-language content display. One advantage was tight integration with Shanda's massive content catalog, providing readers instant access to an enormous library of Chinese-language literature directly through the device. The Bambook was initially offered at a heavily subsidized price point, using the content ecosystem to drive revenue — a model that preceded similar strategies by other e-reader manufacturers. While the Bambook hardware line was eventually discontinued as the Chinese market shifted toward tablet-based reading apps, SNB files from that era can be converted to standard formats using tools like Calibre with appropriate plugins. The format represents an interesting case study in platform-specific ebook ecosystems within the Chinese digital publishing landscape.
Initial release: August 2010
MNG (Multiple-image Network Graphics) is an animation and multiple-image format designed as the animated counterpart to PNG, with its specification reaching version 1.0 on January 31, 2001. Developed by Glenn Randers-Pehrson and members of the PNG development community, MNG extends PNG's capabilities with support for frame-based animation sequences, slide shows, complex sprite overlays, and JNG (JPEG Network Graphics) frames for lossy compression of photographic content within the same container. An MNG file consists of a series of chunks (following PNG's chunk-based architecture): MHDR and MEND chunks bookend the datastream, with embedded PNG or JNG images as individual frames and control chunks (DEFI, FRAM, LOOP, ENDL, TERM, BACK, BASI, CLON, PAST, DISC, SHOW) directing playback timing, looping behavior, layer compositing, and memory management. The format supports both full-frame replacement and delta (difference) updates for efficient encoding of animations with static backgrounds, as well as object-based animation where sprites are defined once and repositioned across frames. One advantage is technical sophistication: MNG provides a level of animation control that GIF and APNG cannot match — frame-accurate timing, nested loops, conditional branches, interframe compression, and mixed lossy/lossless content within a single animation. The PNG-based foundation ensures lossless quality with full alpha transparency for each frame. MNG is supported by ImageMagick, GIMP, and various media players, though browser support was limited, which led to APNG's emergence as a simpler alternative for web animation.
Initial release: January 31, 2001

Frequently Asked Questions

Why convert SNB to MNG?

SNB works only on Bambook. MNG is an animation-capable image format based on PNG — useful for creating animated page sequences from ebook content.

What programs support MNG?

GIMP, Konqueror, and some Mozilla-based browsers historically supported MNG. ImageMagick can create and process MNG files.

How does MNG compare to GIF?

MNG supports full color depth (unlike GIF's 256-color limit) and offers better compression. However, it has less browser support than GIF.

Can MNG contain multiple pages?

Yes. MNG is designed for multiple frames, making it possible to store several ebook pages as an animated sequence in one file.

Is this free to use?

Convertio offers free SNB to MNG conversion. Premium accounts add batch processing and higher file size limits.