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PDB vs TXT

PDB vs TXT

A detailed comparison of PalmDOC eBook and Plain Text — file size, quality, compatibility, and which format to choose for your workflow.

Convert PDB → TXT
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.

About PDB files
TXT

Plain Text

Documents & Text

TXT files contain unformatted plain text with no styling, images, or layout information. They are universally readable by any device and operating system, making them the simplest document format.

About TXT files

Strengths Comparison

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.

TXT Strengths

  • Universally readable — every operating system, every editor, every programming language.
  • Zero metadata overhead: the file size equals the character count (for ASCII).
  • Safe to diff, grep, version-control, and pipe through command-line tools.
  • Immune to format obsolescence: a text file from 1970 still opens today.
  • Tiny footprint for structured data like logs or configuration.

Limitations

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.

TXT Limitations

  • No styling, images, or embedded structure — just characters.
  • Character encoding ambiguity (ISO-8859-1 vs UTF-8 vs Windows-1252) causes "mojibake".
  • Line-ending differences between OSes still cause subtle bugs today.
  • No way to carry hyperlinks, tables, or formatting without a convention on top (like Markdown).

Technical Specifications

Specification PDB TXT
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 — text/plain
Common encodings — UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252
Line endings — LF (Unix), CRLF (Windows), CR (classic Mac)
Max file size — Limited only by filesystem (no format-level limit)
Structure — None — flat sequence of characters

Typical File Sizes

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

TXT

  • Short note < 1 KB
  • README file 2–20 KB
  • Full novel (~90,000 words) 500 KB – 1 MB
  • Server log file (daily) 10 MB – 1 GB

Ready to convert?

Convert between PDB and TXT online, free, and without installing anything. Encrypted upload, automatic deletion after 60 minutes.

Convert PDB to TXT

Frequently Asked Questions

PDB (PalmDOC eBook) 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.

PDB (PalmDOC eBook) 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 PDB. 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 PDB. para desktop reading, Calibre is the universal ebook viewer e library manager. converter to EPUB ou PDF para máximo compatibilidade.

Upload your PDB 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.