eBook Formats Compared: EPUB vs MOBI vs PDF
Compare EPUB, MOBI, AZW3, and PDF for eReaders — compatibility, features, and conversion quality.
Published:
Tags: ebook formats compared, EPUB vs MOBI vs PDF, best ebook format
eBook Formats Compared: EPUB vs MOBI vs PDF EPUB, MOBI, AZW3, and PDF are the four dominant eBook formats. Each has different device compatibility, feature support, and conversion fidelity. Choosing the right format — or deciding which to convert between — depends on your device, use case, and how much control you want over the reading experience. --- What is Format Quick Reference? | Format | Owner | Reflowable | Open Standard | Kindle | Kobo/Nook/iOS | |---|---|---|---|---|---| | EPUB 3 | W3C | Yes | Yes | Via email/app | Native | | EPUB 2 | W3C (legacy) | Yes | Yes | Via email/app | Native | | MOBI | Amazon | Yes | No | Native (older) | No | | AZW3 (KF8) | Amazon | Yes | No | Native | No | | PDF | Adobe/ISO | No (fixed) | Yes (ISO 32000) | Native (poor reflow) | Native (poor reflow) |…
Frequently Asked Questions
What is the best ebook format?
EPUB 3 is the best open standard — it's supported on all major eReaders except Amazon Kindle, offers full reflowable text with modern CSS, and is the W3C-maintained specification. For Kindle specifically, AZW3 (based on EPUB 3) or MOBI are the native formats; Amazon now also accepts EPUB directly via Send to Kindle.
What is the difference between EPUB and MOBI?
EPUB is an open W3C standard supported by all major eReaders except Kindle. MOBI (Mobipocket format) is Amazon's older format used by Kindle. MOBI is technically inferior to EPUB — it supports less CSS and has smaller file size limits. Amazon now prefers AZW3 (KF8) for new Kindle books.
Can I read EPUB on Kindle?
Since 2022, Amazon Kindles accept EPUB files via email to your Kindle address or via the Send to Kindle app. Amazon converts the EPUB to their internal format on receipt. Direct sideloading of EPUB via USB may not work on older Kindle firmware.
What is AZW3?
AZW3 (also called KF8) is Amazon's current Kindle format, introduced in 2011. It's based on EPUB 3 and HTML5, supports CSS3, embedded fonts, and complex layouts. It replaced MOBI as Amazon's preferred format for new Kindle books on the KDP platform.
Which ebook format has the best device support?
EPUB has the widest device support: iOS Books, Android, Kobo, Nook, and all modern eReaders. PDF has universal support across every device but doesn't reflow. MOBI/AZW3 works only on Kindle. For maximum compatibility, publish in EPUB 3 and offer EPUB + PDF.
All articles · theproductguy.in