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HomePDB vs MOBI
.pdb
.mobi

PDB vs MOBI

Compare Palm Database and Mobipocket eBook formats — understand the key differences and when to use each

Format Overview

PDB

Palm Database

Palm Database (.pdb) is a ebook file format.

.pdbebook

MOBI

Mobipocket eBook

MOBI is Amazon's legacy eBook format, originally created by Mobipocket and acquired by Amazon for Kindle devices. MOBI supports basic text formatting, images, tables, and bookmarks. While Amazon has transitioned to newer formats (KF8/AZW3), MOBI remains compatible with all Kindle devices and apps. MOBI files are limited compared to EPUB: they don't support video, advanced CSS, or the latest accessibility features. For publishing on Amazon, authors typically upload EPUB or DOCX files, which Amazon converts to its internal format. Converting MOBI to EPUB provides access to a wider range of e-readers and more modern features.

.mobiebook

PDB vs MOBI: Feature Comparison

FeaturePDBMOBI
Full NamePalm DatabaseMobipocket eBook
File Extension.pdb.mobi
Categoryebookebook
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use PDB vs MOBI

Use PDB when you need:

  • •Files in Palm Database format for maximum compatibility
  • •Industry-standard ebook format support
  • •Wide software and platform compatibility

Use MOBI when you need:

  • •Files in Mobipocket eBook format for specific workflows
  • •Optimized ebook format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

PDB MOBIMOBI PDB
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Learn More About These Formats

PDB Converter MOBI Converter

Frequently Asked Questions

What is the difference between PDB and MOBI?
PDB (Palm Database) and MOBI (Mobipocket eBook) are both ebook file formats. PDB files use the .pdb extension while MOBI uses .mobi. They differ in compression, quality, compatibility, and intended use cases.
Can I convert PDB to MOBI for free?
Yes! Convert999 lets you convert PDB to MOBI completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, PDB or MOBI?
It depends on your use case. PDB (Palm Database) may be better for certain workflows, while MOBI (Mobipocket eBook) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

PDB Converter

Convert from PDB

MOBI Converter

Convert from MOBI

File Tools

Compress, resize, merge

Convert to PDB

All sources → PDB

Convert to MOBI

All sources → MOBI

Format Statistics

Trends & data 2025

More Format Comparisons

JPGvsPNGPNGvsWEBPJPGvsWEBPSVGvsPNGHEICvsJPGBMPvsJPGTIFFvsJPGGIFvsPNG