Free Online PDB to MOBI Converter

Convert PDB to MOBI online for free.

Drop PDB files here

or click anywhere in this box to choose files

Max file size 10MB. Sign up for more.

Selected Files

File Name	Size	Convert To

Convert all to:

Conversion Complete

File Name	File Size	Download

Convert More Files Buy Me a Coffee Download All (ZIP)

About the output format

When MOBI is the right output

MOBI is Amazon's older Kindle format, now largely superseded by AZW3 and KFX. Convert to MOBI when you need side-load compatibility with older Kindle devices (pre-2015 Paperwhite and earlier) or when a self-publishing service specifies MOBI. For modern Kindles, upload EPUB directly to Amazon KDP and let Amazon transcode.

About the PDB Format

PDB (Palm Database) is a legacy ebook format originally developed for Palm OS handheld devices in the late 1990s. Used by Palm Digital Media (formerly Peanut Press) and later eReader, PDB files stored ebooks as compressed text databases optimized for the limited storage and processing power of Palm PDAs. The format supported basic text formatting, chapter navigation, bookmarks, and simple image embedding.

With the discontinuation of Palm OS devices and the rise of modern eReaders and smartphones, PDB has become an obsolete format. Barnes & Noble acquired the eReader platform and migrated its catalog to EPUB for the Nook ecosystem. Ebooks stored in PDB format can no longer be read on current devices without conversion. Converting PDB files to EPUB, PDF, or MOBI rescues these legacy ebooks for use on modern eReaders, tablets, and reading apps, preserving the text content and basic structure of the original files.

PDB to MOBI FAQ

Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert PDB files to MOBI.

Can I convert PDB books to MOBI for my Kindle or Kobo?

Yes. Upload your PDB ebook and iFormat converts it to MOBI with chapter structure, cover art, and formatting preserved. Load the MOBI onto your Kindle, Kobo, Nook, or any eReader that supports the format.

How to convert PDB to MOBI without losing the table of contents

Chapter navigation, the cover image, and text formatting all carry over during conversion. The MOBI has proper chapter links so you can jump between sections on your eReader just like the original PDB.

Can I convert multiple PDB ebooks to MOBI at once?

Yes — upload a batch of PDB files and iFormat converts them all to MOBI. Each book downloads separately or as a ZIP, so you can convert an entire library in one session.

Does the text still reflow after converting to MOBI?

Yes — MOBI keeps text reflowable, so it adapts to any screen size and font setting on your eReader rather than being locked to a fixed page like a PDF.

Which reader is MOBI for?

MOBI is an Amazon ebook format best for older Kindle devices. Convert your PDB to MOBI when your eReader or app opens MOBI more reliably, so the whole library works on one device.

Is there a file size limit for PDB to MOBI conversion?

The free plan supports files up to 50 MB, which covers the large majority of PDB files. For longer or higher-resolution files, Starter raises the limit to 100 MB, Plus to 1 GB, and Pro to 5 GB.

Document Conversion Guides for Free Online PDB to MOBI Converter

Read guides about PDF, Word, and editable document workflows connected to Free Online PDB to MOBI Converter.

How to Compress PDF for LinkedIn Upload (Documents and Resumes)

LinkedIn accepts PDF uploads for carousel-style document posts and resumes. Here is how to optimize them for fast loading, mobile viewing, and maximum engagement.

How to Convert Kindle Books to EPUB — DRM-Free Guide

Convert Kindle books to EPUB for reading on Kobo, Apple Books, or any e-reader. Covers DRM-free books, format differences, and conversion tools.

Ebook Formats Explained — EPUB, MOBI, PDF, AZW3, KFX & More

A complete guide to ebook formats. Compare EPUB, MOBI, AZW3, PDF, and KFX by reader support, features, and when to use each.

EPUB vs PDF vs MOBI — Which Ebook Format Is Best for Reading?

EPUB, PDF, and MOBI each handle ebooks differently. This guide compares reflowable text, device compatibility, DRM, and reading experience to help you pick the right format.