CONVERT
PDB → SNB
Tap to choose your fileDRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 25 MB · Free plan · No signup required
Convert to:
Detecting available formats...
Optimize for
Leave empty to use original name. Extension added automatically.
Uploading...
Processing your file...
Fast, secure PDB to SNB conversion. No registration required.
PDB is an ebook-family format used for digital reading on e-readers and reading apps. Reaching a SNB from there is one hop. A PDB to SNB conversion reflows your ebook from one digital-reading container into another — same text, same chapters, same images, but now in a format your device or reading app actually understands. KaijuConverter runs Calibre server-side, so the output is indistinguishable from running Calibre on a desktop. One more beat. PDB is an ebook-family format used for digital reading on e-readers and reading apps. Receiving format: SNB is an ebook-family format used for digital reading on e-readers and reading apps.
PalmDOC eBook
Source formatPDB (Palm Database) is a generic database format from the Palm OS era that was widely used for ebooks on Palm handheld devices. PalmDOC and Mobipocket both use PDB as their underlying container for storing text-based ebook content.
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 PDB to SNB
SNB works on your specific reader where PDB does not. Ebook formats are tied to ecosystems — SNB is Amazon-native, SNB is IDPF-standard and opens everywhere, pick the one that matches your device and convert the rest.
HOW TO CONVERT
PDB → SNB
Upload the PDB
Drop the ebook file into the uploader. We detect the format and extract metadata automatically.
Convert through Calibre
Calibre parses the PDB structure, reflows content and writes a SNB with the appropriate CSS profile for the target readers.
Download the SNB
Grab the converted ebook; both files auto-delete within two hours of the job finishing.
Common Use Cases
Share across platforms
Send SNB files to anyone without worrying about whether they have the right software for PDB.
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 PDB 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.
PDB vs SNB — Strengths and limitations
What each format does best, and where it falls short.
PDB Strengths
- Compact record-based structure for low-RAM devices.
- Basis of PalmDOC, Mobipocket, eReader, and Kindle AZW formats.
- Well-documented.
- Simple to parse — stable for 30 years.
Limitations
- Ecosystem collapsed with Palm's hardware business.
- Name collides with biochemistry's Protein Data Bank PDB.
- Modern ebook tooling prefers EPUB, AZW3, or direct formats.
SNB Strengths
- Chinese typography support.
- Calibre-compatible.
Limitations
- Deprecated.
- Tiny ecosystem.
- No new content.
PDB vs SNB — Technical specifications
Side-by-side comparison of the technical details.
PDB
- MIME types
- application/vnd.palm (Palm), chemical/x-pdb (biochemistry)
- Extension
- .pdb
- Palm structure
- Header + record list + record data
- Related formats
- PalmDOC, Mobipocket MOBI, AZW
- Namespace clash
- Biochemistry Protein Data Bank is a different format entirely
SNB
- Extension
- .snb
- MIME type
- application/x-snb
- Origin
- Shanda Bambook (China)
| Specification | PDB | SNB |
|---|---|---|
| MIME types | application/vnd.palm (Palm), chemical/x-pdb (biochemistry) | — |
| Extension | .pdb | .snb |
| Palm structure | Header + record list + record data | — |
| Related formats | PalmDOC, Mobipocket MOBI, AZW | — |
| Namespace clash | Biochemistry Protein Data Bank is a different format entirely | — |
| MIME type | — | application/x-snb |
| Origin | — | Shanda Bambook (China) |
PDB vs SNB — Typical file sizes
Approximate file sizes for common scenarios.
PDB
- PalmDOC ebook (text novel) 200 KB - 2 MB
- PalmOS app data store 10 KB - 500 KB
- Protein Data Bank file (biochemistry) 50 KB - 5 MB
SNB
- Chinese novel 500 KB - 3 MB
Quality & Compatibility
Text content is preserved losslessly — every word of the PDB ends up in the SNB. Formatting richness depends on what the SNB container supports; heavy typography that works in PDB may degrade gracefully in SNB, 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 SNB, the source PDB probably had a weak ToC — Calibre respects what it finds, it cannot invent structure that was not there.
- For fixed-layout PDB (art books, technical manuals with diagrams) consider whether a reflowable SNB 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 PDB 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 PDB 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 PDB 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 PDB 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
Other popular pairs involving PDB or SNB
More from PDB
More ways to reach SNB
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.