EPUB, PDF, MOBI, AZW3 — find the right format for your needs.
Ebooks are available in several formats. Understanding the differences can help you choose the right one for your device and reading habits.
The most widely used ebook format. Flexible and responsive — adapts to different screen sizes. Supported by most devices except some Amazon Kindle models.
Preserves the exact layout of a document. Ideal for printing and professional documents. Less flexible on smaller screens but ensures consistency everywhere.
An older ebook format mainly associated with Amazon Kindle. Still supported but largely replaced by newer formats like AZW3.
Amazon Kindle formats optimized for Kindle devices. Commonly used for purchased ebooks from the Kindle store. Often include DRM protection.
A quick guide to the best format for the most common ways of reading:
| Device | Recommended format | Notes |
|---|---|---|
| Kindle (2011 or newer) | AZW3 | Best fonts and layout on modern Kindle |
| Older Kindle | MOBI | Works on every Kindle generation |
| Kobo, Nook, PocketBook | EPUB | Native support, no conversion needed |
| iPhone, iPad, Android | EPUB | Apple Books, Google Play Books and most apps |
| Printing or sharing | Same layout everywhere |
Tip: whatever format your file is in, EPUBKit converts it for free in seconds — and can send Kindle formats straight to your device.
Choosing the best ebook format depends on how and where you plan to read your content. EPUB is the best choice for flexibility and compatibility across most devices, while PDF is ideal when you need to preserve formatting for printing or professional use.
If you are using a Kindle device, formats like MOBI or AZW3 are more suitable, especially for books purchased from Amazon. However, these formats are less versatile outside the Kindle ecosystem.
In many cases, converting between formats is the best solution. Our online tools make this process quick, easy, and completely free — so you can choose the format that best fits your needs without limitations.