Convertlova
EPUBMOBI

EPUB to MOBI Converter
Best Free Online Tools

Compare the top 18 curated tools for converting .epub files to .mobi. No scrolling through 50 sketchy sites — pick a tool in 5 seconds.

EPUB to MOBI · E-books

Convert EPUB to MOBI online — free, in your browser

Need to convert a .epub file to .mobi? You're in the right place. Convertlova has hand-picked 18 EPUB to MOBI converters so you don't have to dig through 50 sketchy results on Google. Every tool below is tested for whether it's truly free, requires signup, adds a watermark, and how fast it actually runs in 2026.

The best free EPUB to MOBI converters work entirely in your browser — you upload your .epub file, the tool processes it (most are done in seconds), and you download the converted .mobi. No software to install, no sign-up wall, no email harvesting. We've ranked each e-books converter by free pricing, no watermark, no signup, and output quality, so the top pick at the top of the list is almost always the one you want.

Why convert EPUB to MOBI?

  • Compatibility — open your e-books file in apps and devices that don't support .epub natively.
  • Smaller file size — .mobi is often more efficient for sharing, uploading, or embedding on the web.
  • Editing — many editors only accept .mobi files, so converting is a one-step unlock.
  • Quality preservation — the right converter keeps your file looking and sounding exactly like the original.

What to look for in a EPUB to MOBI converter

Most online converters technically work, but the experience varies wildly. The four things that actually matter:

  1. Truly free — not "free trial" or "free up to 1 file/day." Filter by Free above.
  2. No signup — you shouldn't need an account to convert one .epub file.
  3. No watermark — the converted .mobi should be indistinguishable from a paid output.
  4. Fast and private — files should be processed quickly and deleted from servers after.

How to convert EPUB to MOBI in 3 steps

  1. Pick the top-ranked EPUB to MOBI tool from the comparison above (or filter by your priority — free, no signup, fastest).
  2. Click Open tool, drag in your .epub file, and start the conversion.
  3. Download the converted .mobi file. Done — most e-books conversions finish in under 30 seconds.
Filter:Showing 18 of 18 tools
Top pick
#1

GroupDocs eBook Converter

products.groupdocs.app
Free
No signupNo watermarkFastStandard

Limits: Files auto-deleted after 24 hours

Supports batch conversion, API available

Open tool
#2

Calibre

calibre-ebook.com
Free
No signupNo watermarkStandardStandard

Limits: Open-source ebook manager

Powerful ebook converter and manager

Open tool
#3

Calibre

calibre-ebook.com
Free
No signupNo watermarkStandardStandard

Limits: Desktop software, batch conversion

Powerful ebook management and conversion tool

Open tool
#4

CloudConvert eBook

cloudconvert.com
Free
No signupNo watermarkStandardStandard

Limits: 25 credits/day free; 1 GB/file paid

Extensive format support, cloud storage integration

Open tool
#5

Convert.FAST

convert.fast
Free
No signupNo watermarkStandardStandard

Limits: 100 free conversions/month, up to 1000 files per batch, 1 GB file size

Bulk conversion support, AI-powered features (OCR, transcription), real-time progress

Open tool
#6

ConvertFiles.com

convertfiles.com
Free
No signupNo watermarkStandardStandard

Limits: Max 250 MB/file, 4 hours retention for guests, 3 days for registered users

Over 517,000 files converted, 4.4/5 rating, supports 300+ formats

Open tool
How it works

How to convert EPUB to MOBI

  1. 1

    Pick a tool from the comparison above. We've ranked them by being free, no-signup and no-watermark.

  2. 2

    Open the tool's website (we link directly — never an affiliate cloak).

  3. 3

    Upload your .epub file. Most tools accept drag-and-drop.

  4. 4

    Download the converted .mobi file. That's it.

Why convert

EPUB vs MOBI — when to convert

.epub and .mobi are both e-books formats. You typically convert when you need:

  • Broader compatibility across apps and devices
  • Smaller file size for sharing or web
  • Different quality / feature tradeoff (transparency, lossless, animation)
  • Editing in software that only opens .mobi

Related conversions

Other ways to convert .epub or to .mobi.

EPUB → PDFEPUB → AZW3EPUB → TXTEPUB → FB2AZW3 → MOBIAZW → MOBIEPUB → AZWEPUB → DOCX

FAQ

What is the difference between EPUB and MOBI?

EPUB and MOBI are both e-books formats. Conversion is generally needed when you want broader compatibility, smaller file size, or different quality/feature tradeoffs (transparency, animation, lossless vs lossy, etc.).

Is converting EPUB to MOBI safe?

Yes — the tools listed here are reputable browser-based converters or trusted desktop apps. We flag tools that require signup, add watermarks, or have file-size limits so you can pick a fully free, no-strings option.

Will I lose quality converting EPUB to MOBI?

It depends on the formats. Lossless-to-lossless conversions preserve quality. Lossy-to-lossy or lossless-to-lossy may reduce fidelity. Look for tools labeled "lossless" in the comparison above when quality matters most.

Can I convert EPUB to MOBI offline?

Yes — several listed tools are open-source desktop apps that work offline. Use the "All tools" page to find offline-capable options.