CONVERT
TXTZ → SNB
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Fast, secure TXTZ to SNB conversion. No registration required.
TXTZ is an ebook-family format used for digital reading on e-readers and reading apps. Reaching a SNB from there is one hop. Need a SNB copy of a TXTZ book for your reader? Upload the file, pick metadata overrides if needed, and download a Calibre-converted SNB that renders correctly on the target device. Reflow, fonts, cover art and navigation all transfer cleanly. Background. TXTZ is an ebook-family format used for digital reading on e-readers and reading apps. Destination side, SNB is an ebook-family format used for digital reading on e-readers and reading apps.
TXTZ eBook
Source formatTXTZ is a zipped plain text ebook format used by Calibre that packages a text file with optional metadata into a ZIP archive. It provides a lightweight ebook container when rich formatting is not required.
S-Note eBook
Target formatSNB (Shanda Bambook) is a proprietary ebook format developed by Shanda Interactive for their Bambook e-reader. It uses a ZIP-based container with XML content and was primarily used in the Chinese ebook market.
Why convert TXTZ to SNB
SNB reflows correctly on the small e-ink screens; some TXTZ files are fixed-layout PDFs or early-generation ePubs that do not resize gracefully. Converting fixes the reading experience on 6-inch screens.
HOW TO CONVERT
TXTZ → SNB
Provide the TXTZ
Select or drag your ebook up to 100 MB. No account or library sign-in is required.
Run Calibre
Our pipeline runs the same Calibre command that powers desktop conversions, with device-appropriate defaults.
Retrieve the SNB
A download link appears when conversion completes. Metadata is preserved inside the SNB for library indexing.
Common Use Cases
Share across platforms
Send SNB files to anyone without worrying about whether they have the right software for TXTZ.
Embed in documents
Drop SNB output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
SNB often produces smaller files than TXTZ for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
TXTZ vs SNB — Strengths and limitations
What each format does best, and where it falls short.
TXTZ Strengths
- Minimalist ebook wrapper.
- Plain-text core.
Limitations
- Niche.
- No reader adoption.
SNB Strengths
- Chinese typography support.
- Calibre-compatible.
Limitations
- Deprecated.
- Tiny ecosystem.
- No new content.
TXTZ vs SNB — Technical specifications
Side-by-side comparison of the technical details.
TXTZ
- MIME type
- application/x-txtz
- Extension
- .txtz
- Container
- ZIP + TXT
- Tool
- Calibre
SNB
- MIME type
- application/x-snb
- Extension
- .snb
- Origin
- Shanda Bambook (China)
| Specification | TXTZ | SNB |
|---|---|---|
| MIME type | application/x-txtz | application/x-snb |
| Extension | .txtz | .snb |
| Container | ZIP + TXT | — |
| Tool | Calibre | — |
| Origin | — | Shanda Bambook (China) |
TXTZ vs SNB — Typical file sizes
Approximate file sizes for common scenarios.
TXTZ
- Novel (plain text) 200 KB - 1.5 MB
SNB
- Chinese novel 500 KB - 3 MB
Quality & Compatibility
Cover images are re-embedded at the device-appropriate resolution, which may compress them more aggressively than the TXTZ did. If you need pixel-perfect covers, override the cover image in Advanced to skip the re-encode.
Tips for Best Results
- Always keep the TXTZ original until you have verified the SNB on the destination device — screenshots in a browser can look fine while e-ink rendering differs.
- For large libraries, batch-convert via a single ZIP upload; the job processes each ebook individually and returns a combined archive.
- Set the output profile (Kindle, Kobo, generic) in Advanced — defaults are sensible but a device-specific profile yields better reflow.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Yes, provided the TXTZ itself has a well-formed ToC. Calibre reads the navigation structure and writes an equivalent ToC into the SNB. If the source lacks a ToC we can generate one from heading levels in Advanced → structure detection.
Uploads run over HTTPS, files are processed in isolated containers, and both the source TXTZ and the SNB output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
No. KaijuConverter does not strip digital rights management. DRM-free TXTZ files — anything you authored yourself, public-domain classics, files from DRM-free retailers — convert without any restriction.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. The cover is extracted from the TXTZ and re-embedded in the SNB at device-appropriate dimensions. You can also override it in Advanced by uploading a custom cover image alongside the book file.
RELATED CONVERSIONS
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Related comparisons
See these formats side by side to understand which fits your use case best.
Secure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.