Understanding Ebook Formats: A Comprehensive Guide

| | April 11, 2024
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The worldwide ebook market is expected to generate revenue of US$14.61bn by 2024. And by 2027, the number of ebook readers is expected to reach 1.1 billion users [1].

Thus, you can see that ebooks have become more popular than ever.

This is why publishers, authors, and readers must understand different ebook formats. They must do so to ensure compatibility on many devices.

This comprehensive guide will cover the various ebook formatstheir pros and cons, and how to choose the best format for your ebook.

We will also cover some of the best ebook creation tools that can help you create ebooks in the correct format.

Let's get started.

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eBook Formats

Ebook Formats Explained

As an avid reader, I've encountered various ebook formats that offer different features and benefits.

Let's learn more about these formats and understand what they are.

An ebook format refers to the way an ebook is created and published. These formats range from familiar ones like PDF, ePUB, and MOBI to less popular ones like ODF and LIT

Knowing the different ebook formats can help you choose the right one for your needs. You might need it for reading, creating, publishing, or hosting an ebook.

What are the Top 5 Ebook Formats?

Popular eBook Formats

There are plenty of ebook formats to choose from, but some stand out as the most common.

The five popular formats are EPUBMOBIPDFAZW, and TXT.

In addition to the plain text file (TXT), there are three relatively popular formats: EPUB, MOBI, and AZWPDF is popular and widely used due to its compatibility with different types of devices.

EPUB is the recommended format for Amazon. MOBI and AZW are Amazon proprietary formats that are compatible with Kindle devices.

Let's learn more about these five popular ebook formats below.


Epub Format

EPUB stands for Electronic Publication. It is an ebook format that allows for the creation of dynamic and interactive digital publications.

These files are designed to be readable on various devices, including smartphones, tablets, and e-readers. EPUB-formatted books are also compatible with most devices, including iOSAndroid, and Windows.

Unlike other formats, EPUB supports reflowable text, making it easier to read on various devices. It offers a range of features, including audio and video, interactive graphics, links, bookmarks, and embedded fonts. 

Most importantly, it is available as an open standard. Thus, anyone can create and distribute EPUB files without having to pay royalties or licensing fees.

Due to these features, it is one of the most popular ebook publishing formats.

Next, we will check out the Mobi format.


MOBI Format

MOBI, short for Mobipocket, is an ebook format created by Mobipocket SA, a French software company acquired by Amazon in 2005.

Amazon Kindle is one of the most popular eReader platforms in the world, and the MOBI format is optimized for use on these devices. 

Readers can easily download and read MOBI ebooks on their Kindle devices or apps without having to convert the files.

Another important feature is that MOBI files are smaller in size than other ebook formats. Thus, they can be easily read on mobile devices and devices with limited storage space.

If your device doesn't support MOBI format, I recommend using an online converter. You can use ones like Docspal or Zamzar. They convert MOBI files into formats like EPUB, LIT, LRF, PDB, PDF, and RB.

Alternatively, you can also explore MOBI files with MOBI File Browser. You can then save them as PDF and EPUB using MOBI Exporter Utility.

3. PDF

PDF Format

I have always been fascinated by the popularity of the Portable Document Format (PDF), which is one of the oldest and most widely used ebook formats out there.

Produced by Adobe, this format offers a fixed layout for ebooks, making it perfect for printing and producing graphic-rich content. It is also compatible with most devices, including iOS, Android, and Windows.

PDF also supports multimedia, hyperlinks, and annotations. This is why PDFs have been used for everything from academic textbooks to manuals and user guides.

However, PDFs are not ideal for reading on eReaders because they require the user to zoom in and out to read the text.

Thus, unlike EPUB and MOBI, PDF is not reflowable, and the layout remains the same on all devices. If you are looking for a versatile ebook format that works on all devices, then EPUB might be the way to go.

However, PDFs are easy to create. You can create and publish multimedia ebooks with detailed visuals and complex designs.

4. AZW

AZW Format

Amazon develops AZW for its Kindle devices. It is like MOBI and offers DRM (Digital Rights Management) protection.

AZW is only compatible with Kindle devices and Kindle apps.

If you're a Kindle user like me, you'll be familiar with the AZW format. AZW started as a variant of MOBI but has since evolved into AZW3, also known as Kindle Format.

It's the default format for newer Kindle models and can support multimedia content like video and sound. But, because it's proprietary, it's not as supported on other e-readers as the more open EPUB format.

Yet, the AZW format is reliable and convenient, especially for purchasing books from the Kindle Store.

The ebook format you choose depends on personal preference and device compatibility. However, I recommend AZW for Kindle users.


TXT is the simplest of all ebook formats. It has no fancy formatting, just space, paragraph, and line breaks.

It is raw text put into a file. As a result, it doesn't have the multimedia features of other formats like EPUB, MOBI, AZW, or PDF. 

However, it is an accepted format that is compatible with almost every ebook reader available.

It's also one of the smallest file sizes of all the formats, which is great for those with limited storage space. 

The lack of formatting may not be ideal for some books. But it's perfect for ebooks that contain text. This includes classic literature, biographies, and memoirs.

A TXT file may not contain fancy images, videos, or interactive content, but sometimes simplicity is the way to go.

The Two Kinds of Ebook Formats

Now that we have explored the top five ebook formats - TXT, EPUB, MOBI, AZW, and PDF, let's dig deeper into the two main types of formats.

  1. The first type is platform-specific formats, such as Amazon's MOBI and AZW, and they can only be read on devices that support those formats.
  2. On the other hand, the second type is platform-independent formats, such as EPUB, which can be read on a variety of devices such as smartphones, tablets, and e-readers.

As an author or publisher, it's important to choose the right format based on your target audience, the type of book you are publishing, and the devices on which you want your readers to access your content.

So, take into consideration the advantages and disadvantages of each format before making a decision.

EPUB: The Widely Accepted Ebook File Format

EPUB is the most widely accepted and functional e-book format.

Compared to other formats, EPUB is more efficient and supports fixed-layout content, making it a great choice for books with lots of text and images.

It's also intended as a single format that publishers and conversion houses can use in-house, as well as for distribution to consumers.

For these reasons, EPUB is supported on almost all digital platforms and is a widely accepted ebook file format that every company recommends without any hesitation. 

From my own personal experience, EPUB files have always been easy to download and read on any device, making it a convenient option for anyone who enjoys reading on-the-go.

Which Ebook Format is Right for You?

So, after looking at all the popular ebook formats in detail, it's time to decide which format is right for you.

Choosing the right ebook format depends on several factors, such as the type of content you're publishing and the devices you're targeting.

Here are some tips to help you choose the right ebook format:

  • For novels, fiction, and non-fiction books, use EPUB as it's widely supported and offers reflowable text for better readability.
  • For textbooks, technical manuals, and other fixed-layout content, use PDF as it ensures consistent formatting across devices.
  • If you're publishing on Amazon's Kindle store, use MOBI or KF8, depending on the features you require and the devices you're targeting.

Morever, if you're an avid book reader and prefer Kindle for reading ebooks, then, I would recommend you to go for the MOBI format. MOBI is the preferred file format for Kindles.

However, if you're looking for a widely accepted file format that is supported on almost all digital platforms, then EPUB is the way to go. It offers reflowable format that easily adapts to small screens and other devices.

Ultimately, the decision solely depends on your personal preferences and the purpose of the ebook.

Pros and Cons of Ebook Formats

Each format has its advantages and disadvantages, and understanding them can help you make an informed decision based on your content and target audience.

  • EPUB is the most popular and widely supported ebook format, making it a great choice for novels, fiction, and non-fiction books.
  • PDF is the best format for textbooks and technical manuals due to its fixed layout, ensuring consistent formatting across devices.
  • MOBI and AZW are compatible with Amazon's Kindle devices and apps, making them ideal for publishing on the Kindle store.

Thus, you need to choose the right ebook format depending on the type of content you're publishing, your audience and the devices you're targeting. 

That being said, here are some important pros and cons of each ebook format:



  • Open standard format that's widely supported
  • Reflowable text for better readability
  • Supports interactive features such as multimedia and hyperlinks


  • Limited support for fixed-layout content such as textbooks
  • Not compatible with Amazon's Kindle devices



  • Compatible with Amazon's Kindle devices and apps
  • Supports images, tables, and hyperlinks


  • Not compatible with other devices besides Kindle
  • Limited formatting options



  • Fixed layout that ensures consistent formatting across devices
  • Supports multimedia, annotations, and hyperlinks


  • Not reflowable, making it less flexible for smaller screens
  • Large file size that can slow down loading times



  • Compatible with Amazon's Kindle devices and apps
  • Supports images, tables, and hyperlinks
  • DRM protection for copyright protection


  • Not compatible with other devices besides Kindle
  • Limited formatting options

Frequently Asked Questions

Q1. What is the most popular ebook format?

Answer. EPUB is the most popular ebook format used worldwide.

Q2. Is it possible to convert a PDF to EPUB?

Answer. Yes, there are various online and offline tools available to convert PDF to EPUB.

Q3. Which ebook format is best for textbooks?

Answer. PDF is the best ebook format for textbooks as it ensures consistent formatting across devices.

Q4. Is it necessary to add DRM protection to my ebook?

Answer. It's not necessary, but DRM protection can prevent unauthorized distribution of your ebook.

Q5. Can I publish an ebook in multiple formats?

Answer. Yes, you can publish your ebook in multiple formats - PDF, EPUB, and MOBI to ensure compatibility across various devices.

Wrapping Up

Choosing the right format is crucial to ensure that your ebook is accessible and readable on various devices.

I hope you found this article on understanding ebook formats helpful. If you've liked it, please share it with your friends on social media.

Suggested reading: ePub vs PDF

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Deepak Choudhary

Deepak Choudhary is the founder of Technicalwall.com. He is a Blogger and an Affiliate Marketing Expert. He publishes useful articles for newbie bloggers related to the following topics - Affiliate Marketing, Email Marketing, Software Reviews, Software Tutorials, Blogging, WordPress, SEO, Passive Income, and more.