CONVERT
TXTZ → PDB
Fast, secure TXTZ to PDB conversion. No registration required.
DRAG. DROP. DONE.
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Max 100 MB · Free plan · No signup required
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TXTZ is an ebook format tuned for reflowable reading on e-readers and mobile devices. Reaching a PDB from there is one hop. Turning TXTZ into PDB is how you unify a mixed ebook library: hand Calibre a folder of TXTZ titles, get back a folder of PDB that your primary reader app indexes consistently. The per-book conversion is fast, and metadata (title, author, ISBN) is detected automatically. A quick refresher — TXTZ is an ebook format tuned for reflowable reading on e-readers and mobile devices. By contrast, PDB is an ebook format tuned for reflowable reading on e-readers and mobile devices.
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.
PalmDOC eBook
Target 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.
Why convert TXTZ to PDB
PDB 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 → PDB
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 PDB
A download link appears when conversion completes. Metadata is preserved inside the PDB for library indexing.
Common Use Cases
Classroom distribution
Schools standardise on PDB for student devices; convert reading lists from TXTZ so every kid sees the same edition.
Accessibility workflows
PDB accessibility features (read-aloud, font scaling, dyslexia fonts) work best on well-formed files converted from TXTZ.
Archive migration
Personal libraries built over a decade mix TXTZ and PDB; normalise on PDB while the original files are still readable.
Author preview copies
Send reviewers a PDB they can open on any device rather than a TXTZ that requires a specific app.
TXTZ vs PDB — 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.
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 vs PDB — Technical specifications
Side-by-side comparison of the technical details.
| Specification | TXTZ | PDB |
|---|---|---|
| MIME type | application/x-txtz | — |
| Extension | .txtz | .pdb |
| Container | ZIP + TXT | — |
| Tool | Calibre | — |
| MIME types | — | application/vnd.palm (Palm), chemical/x-pdb (biochemistry) |
| Palm structure | — | Header + record list + record data |
| Related formats | — | PalmDOC, Mobipocket MOBI, AZW |
| Namespace clash | — | Biochemistry Protein Data Bank is a different format entirely |
TXTZ vs PDB — Typical file sizes
Approximate file sizes for common scenarios.
TXTZ
- Novel (plain text) 200 KB - 1.5 MB
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
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 PDB 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
Frequently Asked Questions
Yes. The free tier accepts files up to 100 MB without registration, email capture or watermarks. 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 PDB. 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 PDB 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 PDB 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.