EPUB vs PDB — Differences, File Size & When to Use Each

EPUB vs PDB

Un confronto dettagliato tra EPUB eBook e PalmDOC eBook: dimensioni del file, qualità, compatibilità e quale formato scegliere per il tuo flusso di lavoro.

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EPUB

EPUB eBook

eBooks

EPUB is the open standard for reflowable digital books. It adapts text to any screen size and is supported by most e-readers except Kindle. EPUB 3 adds support for multimedia and interactivity.

Informazioni sui file EPUB

PDB

PalmDOC eBook

eBooks

PDB (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.

Informazioni sui file PDB

Confronto dei punti di forza

EPUB Punti di forza

Open standard — no vendor lock-in, no DRM required.
Reflowable text — adapts to any screen size, font size, or orientation.
Rich typography via CSS, embedded fonts, and SVG.
Accessibility-first: native support for screen readers, adjustable text, and alt-text.
Universal across every non-Kindle ebook reader and library app.

PDB Punti di forza

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.

Limitazioni

EPUB Limitazioni

Kindle does not support EPUB natively (Amazon wants you to convert to AZW3).
Fixed-layout EPUBs (for children's books, comics) are awkward to author.
Rendering quality varies between apps — some CSS works everywhere, some does not.
Adobe DRM (ADEPT) or Apple FairPlay are optional layers that complicate portability.

PDB Limitazioni

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.

Specifiche tecniche

Specifica	EPUB	PDB
MIME type	application/epub+zip	—
Extension	.epub	.pdb
Container	ZIP archive	—
Markup	XHTML 1.1 (EPUB 2); HTML5 (EPUB 3)	—
Standards	IDPF/W3C EPUB 2.0.1, 3.0, 3.2, 3.3	—
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

Dimensioni tipiche dei file

EPUB

Novel (300 pages, text only) 200-800 KB
Illustrated reference book 5-30 MB
Fixed-layout children's book 30-100 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

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Domande Frequenti

Carica il tuo file EPUB su KaijuConverter per convertirlo in PDF, JPG, PNG o altri formati standard direttamente nel browser senza installare programmi.

Carica il tuo file PDB su KaijuConverter per convertirlo in PDF, JPG, PNG o altri formati standard direttamente nel browser senza installare programmi.

Sì, è gratuita fino a 25 MB (fino a 1 GB con Pass 24h o Pro) e tutti i file vengono eliminati automaticamente dai nostri server dopo 60 minuti.