CONVERT SNB → TXTZ (SNB to TXTZ)
Fast, secure SNB to TXTZ conversion. No registration required.
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Ghostscript + QPDFHOW TO CONVERT SNB → TXTZ
Upload the SNB
Drop the ebook file into the uploader. We detect the format and extract metadata automatically.
Convert through Calibre
Calibre parses the SNB structure, reflows content and writes a TXTZ with the appropriate CSS profile for the target readers.
Download the TXTZ
Grab the converted ebook; both files auto-delete within two hours of the job finishing.
Here is the short version — SNB is an ebook-family format used for digital reading on e-readers and reading apps. Hence the need for TXTZ. SNB to TXTZ conversion is a format rewrite, not a print-out. The result is a first-class, reflowable ebook that a Kindle or Kobo treats exactly like any other book — bookmarks, annotations, library indexing all work normally. Technical note: SNB is an ebook-family format used for digital reading on e-readers and reading apps. Compare that with TXTZ is an ebook-family format used for digital reading on e-readers and reading apps.
Why convert SNB to TXTZ
TXTZ works on your specific reader where SNB does not. Ebook formats are tied to ecosystems — TXTZ is Amazon-native, TXTZ is IDPF-standard and opens everywhere, pick the one that matches your device and convert the rest.
SNB vs TXTZ — Technical specifications
Side-by-side comparison of the technical details.
SNB
- MIME type
- application/x-snb
- Extension
- .snb
- Origin
- Shanda Bambook (China)
- MIME Type
- application/x-snb
- Category
- eBooks
- Full Name
- S-Note eBook
- Conversion Engine
- CALIBRE
TXTZ
- MIME type
- application/x-txtz
- Extension
- .txtz
- MIME Type
- application/txtz
- Category
- eBooks
- Full Name
- TXTZ eBook
- Conversion Engine
- CALIBRE
- Container
- ZIP + TXT
- Tool
- Calibre
| Specification | SNB | TXTZ |
|---|---|---|
| MIME type | application/x-snb | application/x-txtz |
| Extension | .snb | .txtz |
| Origin | Shanda Bambook (China) | — |
| MIME Type | application/x-snb | application/txtz |
| Category | eBooks | eBooks |
| Full Name | S-Note eBook | TXTZ eBook |
| Conversion Engine | CALIBRE | CALIBRE |
| Container | — | ZIP + TXT |
| Tool | — | Calibre |
SNB vs TXTZ — Strengths and limitations
What each format does best, and where it falls short.
SNB Strengths
- Chinese typography support.
- Calibre-compatible.
Limitations
- Deprecated.
- Tiny ecosystem.
- No new content.
TXTZ Strengths
- Minimalist ebook wrapper.
- Plain-text core.
Limitations
- Niche.
- No reader adoption.
Quality & Compatibility
Text content is preserved losslessly — every word of the SNB ends up in the TXTZ. Formatting richness depends on what the TXTZ container supports; heavy typography that works in SNB may degrade gracefully in TXTZ, never lost entirely.
Tips for Best Results
- Set author and title metadata in Advanced before conversion; fixing it after sideloading to a reader is far more work.
- If chapter navigation feels off in the TXTZ, the source SNB probably had a weak ToC — Calibre respects what it finds, it cannot invent structure that was not there.
- For fixed-layout SNB (art books, technical manuals with diagrams) consider whether a reflowable TXTZ actually makes sense before converting.
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 SNB itself has a well-formed ToC. Calibre reads the navigation structure and writes an equivalent ToC into the TXTZ. 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 SNB and the TXTZ 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 SNB 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 SNB and re-embedded in the TXTZ at device-appropriate dimensions. You can also override it in Advanced by uploading a custom cover image alongside the book file.
S-Note eBook
Source 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.
TXTZ eBook
Target 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.
Going the other way? Convert TXTZ back to SNB with the same engine.
Common Use Cases
Share across platforms
Send TXTZ files to anyone without worrying about whether they have the right software for SNB.
Embed in documents
Drop TXTZ output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
TXTZ often produces smaller files than SNB 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.
SNB vs TXTZ — Typical file sizes
Approximate file sizes for common scenarios.
- Chinese novel 500 KB - 3 MB
- Novel (plain text) 200 KB - 1.5 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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