CONVERT PDB → TXTZ (PDB to TXTZ)
Fast, secure PDB to TXTZ conversion. No registration required.
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Ghostscript + QPDFHOW TO CONVERT PDB → TXTZ
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 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.
PDB is an ebook-family format used for digital reading on e-readers and reading apps. Reaching a TXTZ from there is one hop. Our PDB to TXTZ converter uses the same Calibre engine that powers the bulk of the ebook world. Authors use it, bookstores use it, pirates (unfortunately) use it — it is the de-facto standard for ebook format conversion and we just expose it over a simple browser upload. Technical note: PDB 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 PDB to TXTZ
TXTZ works on your specific reader where PDB 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.
PDB vs TXTZ — 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
- MIME Type
- application/x-palm-database
- Category
- eBooks
- Full Name
- PalmDOC eBook
- Conversion Engine
- CALIBRE
TXTZ
- Extension
- .txtz
- MIME Type
- application/txtz
- Category
- eBooks
- Full Name
- TXTZ eBook
- Conversion Engine
- CALIBRE
- MIME type
- application/x-txtz
- Container
- ZIP + TXT
- Tool
- Calibre
| Specification | PDB | TXTZ |
|---|---|---|
| MIME types | application/vnd.palm (Palm), chemical/x-pdb (biochemistry) | — |
| Extension | .pdb | .txtz |
| 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-palm-database | application/txtz |
| Category | eBooks | eBooks |
| Full Name | PalmDOC eBook | TXTZ eBook |
| Conversion Engine | CALIBRE | CALIBRE |
| MIME type | — | application/x-txtz |
| Container | — | ZIP + TXT |
| Tool | — | Calibre |
PDB vs TXTZ — 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.
TXTZ Strengths
- Minimalist ebook wrapper.
- Plain-text core.
Limitations
- Niche.
- No reader adoption.
Quality & Compatibility
Text content is preserved losslessly — every word of the PDB ends up in the TXTZ. Formatting richness depends on what the TXTZ container supports; heavy typography that works in PDB 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 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 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 PDB 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 PDB 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 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 TXTZ at device-appropriate dimensions. You can also override it in Advanced by uploading a custom cover image alongside the book file.
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.
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 PDB 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 PDB.
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 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 TXTZ — Typical file sizes
Approximate file sizes for common scenarios.
- 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
- 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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