CBZ vs PDB
A detailed comparison of Comic Book Archive (ZIP) and PalmDOC eBook — file size, quality, compatibility, and which format to choose for your workflow.
Comic Book Archive (ZIP)
eBooksCBZ is a ZIP archive containing sequential comic book page images.
About CBZ filesPalmDOC eBook
eBooksPDB (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.
About PDB filesStrengths Comparison
CBZ Strengths
- Trivially simple — a ZIP of ordered images.
- Universal comic reader support since 2003.
- No DRM — archive-friendly, portable across devices.
- Small files thanks to JPEG/PNG compression of each page.
- Works on Kindle, Kobo, phones, tablets, desktops.
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
CBZ Limitations
- No standardized metadata (ComicInfo.xml is a convention, not required).
- Quality depends entirely on the source images.
- Relies on alphabetical filename order — inconsistent naming breaks reading order.
- No interactive features (unlike animated comics on Comixology Guided View).
PDB 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.
- Very little new content written as PDB in 2026.
Technical Specifications
| Specification | CBZ | PDB |
|---|---|---|
| MIME type | application/vnd.comicbook+zip | — |
| Extension | .cbz | .pdb |
| Container | ZIP | — |
| Siblings | .cbr (RAR), .cb7 (7z), .cbt (TAR) | — |
| Optional metadata | ComicInfo.xml | — |
| 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 |
Typical File Sizes
CBZ
- Single comic issue (24-32 pages) 20-80 MB
- Manga volume (200 pages) 80-250 MB
- Full story arc (multi-issue) 200 MB - 1 GB
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
Ready to convert?
Convert between CBZ and PDB online, free, and without installing anything. Encrypted upload, automatic deletion after 60 minutes.
Frequently Asked Questions
CBZ (Comic Book Archive (ZIP)) is an ebook format designed for reading long-form text on dedicated e-readers, tablets, and ebook apps. It is part of the ebooks family and typically supports reflowable text, embedded images, chapter navigation, cover art, and metadata (title, author, ISBN) in a portable package.
CBZ (Comic Book Archive (ZIP)) is an ebook formato designed para reading long-form text on dedicated e-readers, tablets, e ebook apps. It is part of the ebooks family e tipicamente suporta reflowable text, embedded images, chapter navigation, cover art, e metadata (title, author, ISBN) em um portable package.
Dedicated e-readers — Kindle, Kobo, Nook, Pocketbook — support the most common ebook formats. On phones, Apple Books, Google Play Books, Moon+ Reader and KOReader all handle CBZ. For desktop reading, Calibre is the universal ebook viewer and library manager. Convert to EPUB or PDF for maximum compatibility.
Dedicated e-readers — Kindle, Kobo, Nook, Pocketbook — support the most common ebook formatoos. On phones, Apple Books, Google reproduzir Books, Moon+ Reader e KOReader all handle CBZ. para desktop reading, Calibre is the universal ebook viewer e library manager. converter to EPUB ou PDF para máximo compatibilidade.
Upload your CBZ to KaijuConverter and pick EPUB, MOBI, PDF, AZW3, or similar targets. Our Calibre-powered pipeline preserves chapter structure, embedded images, cover art, and metadata. Conversion takes seconds for typical novels; long technical books with many images may take a little longer.
EPUB is the open ebook standard — it plays on every e-reader except older Kindles and in every major ebook app. PDF is better for fixed-layout content (textbooks, coffee-table books) and printing. Pick EPUB when the ebook is reflowable text, PDF when the layout matters more than the reading experience.