Runs 100% locally via Rust WebAssembly

Convert MOBI to EPUB Online Free

Convert MOBI to EPUB online for free. Fast, private in-browser conversion via WebAssembly with zero file uploads and instant download.

MOBI to EPUB Output Settings

EPUB Quality 92%

High visual fidelity, recommended for photos

Preserve EXIF Metadata Keep camera settings, date, and lens details

Strip GPS Location (Privacy) Remove latitude/longitude coordinates

MOBI vs EPUB Technical Comparison

Architectural differences, compression standards, and platform support technical specifications

Technical Specifications

Specification	MOBI (Source)	EPUB (Target)
Full Name	Mobipocket E-Book Format	Electronic Publication
MIME Type	application/x-mobipocket-ebook	application/epub+zip
Compression	PalmDOC / LZ77 compression	Deflate ZIP package of HTML/CSS
Transparency (Alpha)	None	None
Native Browser Support	Limited (Requires WASM)	Standard Target
Typical Payload	1.2 MB - 8 MB	1.5 MB - 10 MB
Best Use Case	Amazon Kindle devices, sideloading documents, and e-ink displays	Apple Books, Kobo, Android e-readers, and cross-platform responsive publishing

Interactive Engineering Utility

Typography Font Subset & Brotli Compression Estimator

Real-time client-side calculation based on your MOBI to EPUB configuration

Zero Latency • In-Browser

Glyph Count in Font/Document Total vector outlines and OpenType tables

Character Range Target character subsetting coverage

Raw TTF/OTF Font: 187.5 KB

Brotli WOFF2: 46.9 KB (-75%)

FCP Latency Savings: ~140 ms

How to Convert MOBI to EPUB in 4 Steps

100% private, zero-server upload conversion workflow

Select .MOBI Files

Drag and drop your .mobi photos or click the browse button to select from your device.

Configure Settings

Tune EPUB compression quality, preserve camera EXIF details, or strip GPS location.

Instant WASM Conversion

Compiled Rust WebAssembly decodes the MOBI stream and encodes the clean EPUB in sub-50ms.

Download EPUB

Click download to save your high-compatibility EPUB file directly to your downloads folder.

Frequently Asked Questions

Common questions about MOBI to EPUB conversion

How does in-browser MOBI to EPUB conversion protect my privacy?

Unlike legacy file converters that upload your confidential files to cloud servers, OpenFileConverter runs 100% locally on your computer or phone using Rust WebAssembly. Your original MOBI files never leave your device memory, guaranteeing zero retention.

What is the main difference between MOBI and EPUB?

MOBI (Mobipocket E-Book Format) provides amazon kindle devices, sideloading documents, and e-ink displays, while EPUB (Electronic Publication) is optimized for apple books, kobo, android e-readers, and cross-platform responsive publishing. Converting allows you to balance file size, compression fidelity, and platform compatibility.

Does converting MOBI to EPUB degrade visual quality?

No. OpenFileConverter uses high-fidelity chroma subsampling with configurable quality levels (default 92%), ensuring virtually indistinguishable image fidelity with sharp edges and rich colors.

Can I convert multiple files in batch?

Yes. You can drag and drop up to 100 files simultaneously. Because processing executes in parallel on your local CPU threads, batch jobs finish in seconds without queue wait times.