CGM to SNB Converter

Convert CGM metafiles to Shanda Bambook SNB online

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Bambook Compatible

SNB delivers content to Shanda Bambook devices. Convert CGM technical graphics for this Chinese e-reader ecosystem.

Web-Only Tool

No specialized software required. Convert CGM to SNB entirely in your web browser — upload and download.

Remote Processing

All conversion runs on Convertio servers. Your device stays free while the SNB file is generated.

How to convert CGM to SNB

1

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

2

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

3

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

About formats

CGM (Computer Graphics Metafile) is a vector graphics standard defined by ISO 8632, first published in 1987 and developed through the ISO/IEC JTC 1/SC 24 committee. The standard defines a device-independent format for storing and transferring two-dimensional vector graphics, raster images, and text. CGM supports three encoding methods: character encoding (compact text representation), binary encoding (efficient machine-readable form), and clear-text encoding (human-readable for debugging). The format describes graphical primitives including polylines, polygons, ellipses, circular arcs, splines, and text with associated attributes for color, line style, fill patterns, and clipping boundaries. CGM found its strongest adoption in technical documentation, particularly in aerospace, defense, and industrial sectors where long-term archival and precise technical illustration are critical. One advantage is formal standardization — as an ISO standard, CGM provides vendor-neutral, specification-driven interoperability guaranteed across compliant implementations. The format's adoption in specialized industries is another practical strength: WebCGM, a W3C profile of CGM, became the mandated illustration format for interactive electronic technical manuals in the aerospace industry (ATA iSpec 2200), ensuring CGM's continued relevance in aviation maintenance documentation. While general-purpose vector work has moved to SVG and PDF, CGM persists in regulated industries where certified, standards-based graphics interchange is mandatory.
Initial release: 1987
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

Frequently Asked Questions

Why convert CGM to SNB?

SNB is the Shanda Bambook ebook format. CGM to SNB packages technical graphics for this specific Chinese e-reader platform.

What opens SNB files?

Shanda Bambook devices, Calibre (for conversion), and some third-party Chinese ebook readers support the SNB format.

Is SNB a regional format?

Yes — SNB is primarily used with Shanda Bambook readers in the Chinese market. For broader reach, EPUB is more common.

Is CGM to SNB free?

Standard conversion is free. Premium subscriptions provide extended capacity.

Browser support?

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