Free Online EPUB to PDB Converter

Convert EPUB to PDB online for free.

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About the EPUB Format

EPUB (Electronic Publication) is the most widely adopted open ebook standard, maintained by the W3C (formerly IDPF) and published as ISO/IEC 23736. First released in 2007 as the successor to the Open eBook format, EPUB uses XHTML for content, CSS for styling, and ZIP compression for packaging. Its defining feature is reflowable text — content automatically adapts to fit any screen size, allowing readers to adjust font size, margins, and line spacing on phones, tablets, and dedicated eReaders.

EPUB is natively supported by Apple Books, Kobo, Nook, Google Play Books, and nearly every eReader and reading app outside the Kindle ecosystem. EPUB 3, the current version, adds support for embedded fonts, SVG graphics, MathML equations, JavaScript interactivity, audio/video embedding, and comprehensive accessibility features including text-to-speech and screen reader support. While Kindle devices do not read EPUB natively, the format can be converted to MOBI or AZW3 for Kindle compatibility.

EPUB to PDB FAQ

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

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

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

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

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

Can I convert multiple EPUB ebooks to PDB at once?

Yes — upload a batch of EPUB files and iFormat converts them all to PDB. 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 PDB?

Yes — PDB 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 PDB for?

PDB is the PDB format best for its intended use. Convert your EPUB to PDB when your eReader or app opens PDB more reliably, so the whole library works on one device.

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

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

Need the reverse conversion?

Convert PDB back to EPUB with our companion tool.

PDB to EPUB converter

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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.

How to Open EPUB Files Without a Kindle — Free Readers for Every Device

Got an EPUB file and not sure how to open it? Here are the best free EPUB readers for Windows, Mac, iPhone, iPad, Android — and how to read EPUBs on a Kindle.

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.