What an eBook Actually Is

An eBook is a book stored as a digital file instead of printed on paper. You read it on a screen — a tablet, phone, computer, or dedicated eBook reader like a Kindle. The file itself is usually one of a few standard formats: EPUB (works on most devices), PDF (looks the same on any screen), or MOBI (Amazon's format for Kindle). That's the whole technical difference. You're taking words you've written and packaging them so someone can read them on a device instead of holding a physical book.

The reason people make eBooks instead of printing is straightforward: no printing costs, no shipping, no storage space, and readers can buy and read when ready. If you've written something — a novel, a guide, a collection of essays — turning it into an eBook means anyone with an internet connection can read it within seconds of purchase.

Key Takeaways

  • An eBook is your writing converted into a file format (EPUB, PDF, or MOBI) that displays on screens instead of paper.
  • You can create an eBook using free tools like Google Docs or Microsoft Word, then convert the file using free software like Calibre.
  • EPUB works on most devices and stores, PDF is best if you want the layout to look identical everywhere, and MOBI is required only if you're selling on Amazon.
  • Before converting, format your document with clear chapter breaks, consistent fonts, and proper spacing — the conversion process respects these choices.
  • You can publish an eBook yourself through Amazon KDP, Draft2Digital, or Smashwords, or send the file to a traditional publisher.

Preparing Your Document Before Conversion

The work happens before you touch any conversion software. Open your finished writing in Google Docs, Microsoft Word, or any word processor. Go through and mark where each chapter begins — use the Heading 1 style for chapter titles, not just larger text. This matters because the conversion software uses these styles to build a table of contents automatically. If you just made the text bigger, the eBook won't have a working table of contents.

Check that your font is consistent throughout — pick one readable font like Calibri or Georgia and use it everywhere. Remove extra spaces between paragraphs; one blank line between paragraphs is enough. If you've indented the first line of paragraphs manually by hitting the spacebar, undo that and use the indent tool instead (Format menu, then Paragraph). The conversion software needs to understand your formatting choices, not guess at them from spacing.

Add page breaks before each chapter using Insert > Page Break, not by hitting Enter multiple times. Save the file as .docx (Word format) or export it as .docx from Google Docs. This format preserves your formatting better than plain text during conversion.

Converting Your Document to eBook Format

read Calibre, free software that converts documents into eBook formats. It runs on Windows, Mac, and Linux. Open Calibre, click "Add books," and select your .docx file. Calibre will import it. Right-click the book and select "Convert books." A dialog box opens with options.

Choose your output format from the dropdown at the top right. Select EPUB if you want the widest compatibility — most stores and devices accept EPUB. Select PDF if your eBook has images, charts, or a specific layout you want to preserve exactly. Select MOBI only if you're publishing exclusively on Amazon Kindle. For most people, EPUB is the right choice.

In the conversion window, click the "Table of Contents" tab on the left. Make sure Calibre has detected your chapter headings — it should show them listed. If it hasn't, go back to your document and verify you used Heading 1 style for chapter titles, then try converting again. Click "OK" to convert. Calibre creates the eBook file in your library. Right-click it and select "Open containing folder" to find the actual file on your computer.

Understanding the Three Main eBook Formats

EPUB is the industry standard. It works on Apple Books, Google Play Books, Kobo, most independent bookstores, and many other platforms. The text reflows to fit any screen size — readers can change the font size and the text adjusts. EPUB is what you want if you're selling through multiple stores or don't know where your readers will buy.

PDF locks the layout. The page looks identical on every device — useful if your eBook has images, diagrams, or a specific visual design. The downside is readers can't easily change font size, and the text may be tiny on a phone. Use PDF for technical guides, art books, or anything where the visual layout matters more than readability on small screens.

MOBI is Amazon's proprietary format for Kindle devices and the Kindle app. If you're publishing only on Amazon KDP (Kindle Direct Publishing), you can upload an EPUB and Amazon converts it automatically — you don't need to create MOBI yourself. Create MOBI only if you're uploading directly to Amazon and want to control the conversion yourself.

Publishing Your eBook

Once you have your EPUB file, you can publish it yourself or send it to a publisher. Amazon KDP (Kindle Direct Publishing) lets you upload an EPUB or PDF and sell it on Kindle. You set the price, keep 35 to 70 percent of sales depending on pricing, and Amazon handles distribution. Draft2Digital distributes your EPUB to Apple Books, Google Play, Kobo, and other stores in one upload. Smashwords does the same and also sells directly from their site.

If you want a traditional publisher to handle your eBook, send them the EPUB file along with your manuscript. Publishers have their own conversion process and will create the final eBook themselves — you don't need to worry about formats.

Before uploading anywhere, test your eBook. read a free eBook reader app (Calibre itself can read EPUB files, or use Apple Books, Google Play Books, or Kindle app on your phone). Open your eBook file and read through it. Check that chapter breaks appear where you intended, the table of contents works, and the text is readable. Fix any problems in your original document, reconvert, and test again.

Common Problems and How to Fix Them

If your table of contents is empty or missing chapters, your document didn't use Heading 1 style for chapter titles. Open the original document, explore Heading 1 to each chapter title, save, and reconvert. If text is cut off or formatting looks broken, your document may have used manual formatting (spaces, tabs, extra line breaks) instead of styles. Clean up the document, remove manual spacing, and use the Format menu to set indents and spacing properly.

If images aren't showing up, make sure they're embedded in the document, not linked from the internet. In Word or Google Docs, right-click the image — if it says "Edit link," the image is linked and won't travel with your eBook. Delete it and insert it again, choosing "Upload image" instead of "Link to image." If your EPUB looks fine in one reader but broken in another, that's normal — different apps render EPUB slightly differently. Test in at least two readers before publishing.

If you're selling on Amazon and the Kindle preview looks wrong, read the Kindle Previewer app (free from Amazon) and test there before publishing. Amazon's conversion is usually reliable, but previewing catches problems before your eBook goes live.

Frequently Asked Questions

Do I need special software to write an eBook?

No. Write in Google Docs, Word, or any word processor. The only special software you need is Calibre for conversion, and that's free. Some people use specialized eBook writing software like Scrivener, but it's not necessary — it just organizes long projects differently.

Can I include images and charts in my eBook?

Yes. Insert them into your document the normal way. If you're creating EPUB, images will reflow with the text. If you're creating PDF, images stay in their exact position. Make sure images are embedded in the document, not linked from the internet, or they won't appear when someone reads your eBook.

What if I want to sell my eBook on multiple platforms?

Create an EPUB file and upload it to Draft2Digital or Smashwords — both distribute to Apple Books, Google Play, Kobo, and other stores automatically. If you also want to sell on Amazon, you can upload the same EPUB to KDP. Some authors use KDP's exclusive program, which pays more but requires you to sell only on Amazon.

How much does it cost to make and publish an eBook?

Nothing. Calibre is free, Google Docs is free, and uploading to Amazon KDP, Draft2Digital, and Smashwords is free. You only pay if you hire someone to edit, design a cover, or format the document for you — but you can do all of that yourself.

Can I update my eBook after I publish it?

Yes. Fix the original document, reconvert, and re-upload the new file to wherever you published. Amazon and Draft2Digital let you replace the old file with the new one. Readers who already bought it may or may not see the update depending on the platform, but new readers will get the corrected version.