Convert ALAC to M4B

ALAC to M4B converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

About formats

ALAC

ALAC (Apple Lossless Audio Codec) is a lossless audio codec developed by Apple and open-sourced in 2011. ALAC compresses audio without quality loss and is used in Apple Music's high-fidelity tier. ALAC files are typically stored in M4A containers and are supported by all Apple devices and most modern players.

Developer
Apple
Initial release
2004
Compression
Lossless
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • Apple Music high-fidelity listening
  • Lossless audio on Apple devices
  • Audiophile music in M4A containers
  • High-resolution music archival
  • Apple-ecosystem lossless collections

Pros

  • +Lossless compression with no quality loss
  • +Open-sourced by Apple in 2011
  • +Stored in M4A containers for Apple compatibility
  • +Supports up to 24-bit depth

Cons

  • −Larger than lossy formats
  • −Less cross-platform than FLAC
  • −Apple-ecosystem oriented
  • −Some non-Apple players lack ALAC support

M4B

M4B is an MPEG-4 audio container variant specifically designed for audiobooks. It is identical to M4A in structure but supports chapter markers and bookmarking so players can resume playback. M4B is commonly used by iTunes and Apple Books.

Developer
Apple
Initial release
2003
Compression
Lossy or lossless
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • Distributing audiobooks with chapters
  • iTunes and Apple Books audio
  • Bookmarkable spoken-word content
  • Long-form audio with navigation
  • Resumable podcast delivery

Pros

  • +Supports chapter markers and bookmarking
  • +Resumes playback across devices
  • +Identical audio quality to M4A
  • +Recognized by iTunes and Apple Books

Cons

  • −May carry FairPlay DRM
  • −Less universal than plain MP3
  • −Primarily Apple-ecosystem format
  • −Some players ignore chapter markers

How to convert ALAC to M4B

  1. 1

    Select ALAC files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.

  2. 2

    Choose m4b — or any other format you need as a result (more than 200 formats supported).

  3. 3

    Let the file convert, then download your m4b file right away.

ALAC vs M4B

PropertyALACM4B
CompressionLosslessLossy or lossless
Color depthup to 24-bitup to 24-bit
Multi-trackYesYes
DRM supportNoYes
Open formatYesNo

When to use ALAC vs M4B

ALAC

  • Apple Music high-fidelity listening
  • Lossless audio on Apple devices
  • Audiophile music in M4A containers
  • High-resolution music archival
  • Apple-ecosystem lossless collections

M4B

  • Distributing audiobooks with chapters
  • iTunes and Apple Books audio
  • Bookmarkable spoken-word content
  • Long-form audio with navigation
  • Resumable podcast delivery

Use cases for ALAC → M4B

  • Apple Music high-fidelity listening
  • Lossless audio on Apple devices
  • Audiophile music in M4A containers
  • High-resolution music archival
  • Apple-ecosystem lossless collections
  • Distributing audiobooks with chapters
  • iTunes and Apple Books audio
  • Bookmarkable spoken-word content
  • Long-form audio with navigation
  • Resumable podcast delivery

Frequently Asked Questions

Is converting ALAC to M4B free?
Yes. This ALAC → M4B converter runs entirely in your browser and is completely free — no account, no credits, no watermark.
Which devices and platforms can I use to convert ALAC to M4B?
Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.
Are my ALAC files uploaded to a server?
No. Files never leave your device. The entire ALAC → M4B conversion runs locally in your browser, so your data stays private.
Can I convert multiple ALAC files at once?
Yes — batch conversion is supported. Add as many ALAC files as you like and convert them to M4B in one pass, then download the results together.
What is the maximum file size?
There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.
Will converting ALAC to M4B reduce the quality?
Because both formats use lossy compression, the M4B output will not bring back any quality that has already been lost in your ALAC file. Avoid repeated re-encoding to keep the best quality.
Does M4B support transparency?
No — M4B has no alpha channel. Transparent areas of your ALAC file will be filled with a solid background colour in the converted file.
Will the converted M4B file be smaller than the ALAC?
Usually yes. Converting from a lossless or uncompressed format to a lossy one dramatically reduces file size. Typical savings range from 50% to 90%, depending on the quality setting you choose.

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FREE

100% Free

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SIGNUP

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PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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