Best Free Ebook Converters in 2026 — EPUB, MOBI, PDF, and More

Ebook format conversion should be simple. You have an EPUB, you want a MOBI. Or you have a PDF and want it readable on a Kindle. In theory, it's just data reformatting.

In practice, there are about fifteen ways to screw it up: broken table of contents, missing cover images, mangled formatting, lost metadata. I've tested the main options so you can avoid the worst of it.

Quick Format Primer

Before we get into tools, know what you're dealing with:

• EPUB: The universal standard. Works on Kobo, Apple Books, Google Play Books, and most readers except Kindle.
• AZW3/KF8: Amazon's Kindle format. Essentially EPUB with DRM wrapping. Amazon stopped accepting MOBI for new uploads in 2023.
• MOBI: Legacy Kindle format. Still works on older Kindles. No reason to use it for new content.
• PDF: Fixed layout, terrible for reading on small screens. Only use for print-replica content.
• FB2: Popular in Russia and Eastern Europe. Some readers prefer it.

1. Desktop Ebook Managers — The Power Option

Platform: Windows, Mac, Linux | Price: Free

The best ebook conversion happens in dedicated desktop ebook management software. These tools handle EPUB, MOBI, AZW3, PDF, DOCX, HTML, TXT, RTF, FB2, LIT, PDB, and dozens more formats. The conversion settings let you control everything: output profile per device, font embedding, margin adjustment, table of contents generation, cover image handling.

Batch conversion is where desktop tools really pull away. Select 500 books, set your output format, walk away. Come back to a converted library.

Metadata management is the other killer feature. Desktop ebook managers download covers, descriptions, tags, and series information automatically. Your ebook library goes from a messy folder of files to a searchable, organized collection. Best for: Anyone with an ebook library. Heavy converters. People who want total control.

2. MyPDF Ebook Converter — Best Quick Online Option

Platform: Any browser | Price: Free MyPDF's ebook conversion tools are designed for one-off jobs. Convert an EPUB to PDF for printing, turn a DOCX manuscript into EPUB, or convert between reader formats.

No software to install, no account needed. Upload, pick your target format, download. The conversion preserves basic formatting, chapter structure, and metadata.

It won't match a desktop ebook manager's fine-grained control over output profiles and font handling. But if you need to convert one file right now and you're on a Chromebook or a work computer where you can't install software, it gets the job done.

Best for: Quick single-file conversions. Users who don't want to install desktop software.

3. Online-Convert.com — Broad Format Support

Platform: Browser | Price: Free (3 conversions/day), paid from $8.50/month

Online-Convert supports a wide range of ebook formats including some niche ones (LIT, PDB, TCR). The free tier limits you to 3 conversions per day and 100 MB file size.

Quality is decent for straightforward conversions. Complex layouts with images and tables can break. The paid tier removes limits and adds batch processing.

Best for: Rare format conversions (LIT to EPUB, etc.) when desktop software isn't available.

4. Zamzar — Simple But Limited

Platform: Browser | Price: Free (2 files/day, 50 MB), paid from $18/month

Zamzar has been around since 2006. The ebook conversion is basic — it handles the major formats but doesn't offer any customization. You can't set margins, choose fonts, or adjust the table of contents.

The free tier is restrictive: 2 files per day, 50 MB max. For ebook conversion specifically, there are better free options.

Best for: If you literally need one conversion and don't want to think about it.

The DRM Elephant in the Room

Here's what nobody in this space says openly: most purchased ebooks have DRM (Digital Rights Management). DRM-protected files cannot be converted by any of these tools. No desktop software will do it. Online converters won't do it. The file will either fail to open or produce garbage output.

If you purchased an ebook from Amazon, Apple, or Kobo, it's almost certainly DRM-protected. Your options are:

1. Read it in the store's official app (what publishers want)
2. Look for DRM-free retailers like Smashwords, DriveThruFiction, or direct-from-author sales
3. Buy from stores that sell DRM-free by policy (Tor Books, some indie publishers)

Always buy DRM-free when you can. You own the file, you can convert it however you want.

My Conversion Workflow

For what it's worth, here's what I actually do: a desktop ebook manager for my library and batch conversions. MyPDF on my phone or laptop when I need to quickly convert a single file someone sent me. That combination handles everything.

Related Tools

• EPUB to PDF — Convert ebooks to PDF for printing or sharing
• PDF to EPUB — Make PDFs readable on e-readers
• Word to EPUB — Convert manuscripts to ebook format
• EPUB to MOBI — Convert for older Kindle devices