An M4B file is the standard audiobook format used by Apple Books, iTunes, and most audiobook players. It uses AAC (Advanced Audio Coding) compression, which delivers smaller file sizes than MP3 at the same audio quality - meaning your audiobooks take up less storage on your device. M4B files also support chapters, bookmarks, and cover art, so you can skip between sections and resume exactly where you left off.

Why use M4B instead of MP3 for audiobooks?

While MP3 files can store basic metadata like title and artist, they don't natively support chapters or bookmarks - so you lose your place every time you close the player, and you're stuck managing dozens of individual files per audiobook. M4B solves all of this: it combines everything into a single file with full chapter navigation, cover art, and bookmark support. It also uses AAC encoding, which produces better sound quality at lower bitrates than MP3, resulting in smaller files that sound just as good or better.

How do I create an audiobook on my iPhone or iPad?

With M4Bindr, just open the app, import your audio files (MP3, M4A, or M4B), arrange them as chapters, add metadata like title, author, and cover art, then tap Build. M4Bindr combines everything into a single M4B audiobook file right on your device - no computer needed.

Can I convert other audio files to M4B audiobooks?

Yes! M4Bindr is designed to convert MP3, M4A, and even other M4B files into a single M4B audiobook format. Import your DRM-free audio files, organize them into chapters, and build a professional audiobook in minutes. When you combine existing M4B files, their original chapters are fully preserved in the new audiobook.

What can I do with the free version?

The free version lets you use M4Bindr as much as you want - there's no time limit or trial period. It does limit the size of audiobooks you can create (up to 30 minutes of audio and 3 chapters), so it's perfect for testing things out and seeing if M4Bindr is right for you before upgrading.

Is there a subscription?

No. M4Bindr Pro is a one-time purchase of $5.99. Pay once and unlock unlimited audiobook creation forever - no recurring fees, no hidden costs.

How do I add chapters to my audiobook?

Each audio file you import becomes a chapter in your audiobook. Simply arrange them in the order you want, name each chapter, and M4Bindr will build a chapterized M4B file that lets you skip between sections in any audiobook player.

Can I add cover art and metadata to my audiobook?

Absolutely. M4Bindr lets you add a title, author, narrator, genre, year, description, copyright, and a custom cover image. All metadata is embedded directly into the M4B file so it displays correctly in Apple Books and other audiobook apps.

Do I need a computer to make audiobooks?

No. M4Bindr runs entirely on your iPhone or iPad. Import audio files from your device, configure chapters and metadata, and build a finished M4B audiobook without needing a desktop app or web service.

How do I get a refund?

All purchases are processed through the App Store. To request a refund, visit reportaproblem.apple.com, sign in with your Apple ID, find the M4Bindr purchase, and follow the steps to submit your refund request. Apple handles all refunds directly.

Can I use M4Bindr on my other Apple devices?

Yes! M4Bindr supports Universal Purchase. If you've already bought Pro access, simply open the app on your other device and tap "Restore Purchases" to unlock it - no need to pay again. It works across iPhone and iPad.

What audio formats does M4Bindr support?

M4Bindr supports DRM-free MP3, M4A, and M4B audio files. This means you can combine multiple M4B files together, or add M4B files to other formats to create a single professional M4B audiobook.

Can I listen to my audiobooks in Apple Books?

Yes. M4B is the native audiobook format for Apple Books. Once you've built your audiobook in M4Bindr, you can share or export the file to a mac where you can sync it to your iphone or ipad and open it directly in Apple Books with full chapter and bookmark support.

April 2026

How to Change Audiobook Covers and Edit .m4b Metadata on iPhone

Missing a book cover, author details, or correct titles? Learn how to easily insert cover art into .m4b files, update tags, and edit audiobook metadata directly on your iPhone.

One of the biggest frustrations when downloading audiobooks outside of official stores is messy metadata. You import a file into your favorite player, and it shows up with an "Unknown Artist," a generic title like Track_01, or a blank gray square instead of the beautiful cover art you expected.

In the past, fixing these tags required connecting your phone to a Mac or PC and using dedicated desktop software. Now, you can easily add or edit the metadata of an audiobook directly on your iPhone.

Why Does Audiobook Metadata Matter?

Metadata consists of the hidden tags embedded within the audiobook file. This information tells apps like Apple Books what they are looking at. Proper metadata ensures your library stays organized and visually appealing. Essential audiobook metadata includes:

Title: The actual name of the book.
Author and Narrator: Keeps your library sortable by creator.
Release Year: Helpful for tracking the chronological order of a series.
Cover Art: Provides the visual thumbnail for your library shelf.

How to Edit Tags and Add Cover Art to M4B Audiobooks

You can securely bind and edit the metadata of your audio files directly on iOS using the M4Bindr audiobook creator. Here is how:

Import Your Audio: Open the M4Bindr app and tap Add Audio Files. Select the loose MP3, M4A, or existing M4B files you wish to organize.
Open the Metadata Sheet: Once your chapters are loaded, tap the Add Metadata button on the home screen. A bottom sheet will smoothly slide up, presenting all the editable fields.
Input the Details : Because the tool generates a clean slate every time, you will need to input all the data from scratch. Enter the true Book Title, Author, and Narrator. The more information you provide, the better your audiobook will look in your library.
Add Cover Art: Tap the image placeholder to upload a custom cover. Whether you need to fix a missing thumbnail or insert high-res cover art into your .m4b file, this is the easiest way to do it. Just save the official book cover from Safari to your Photos app and select it here.
Save and Bind: Tap Save to lock in your tags. Then, simply tap Bind. The app will generate a brand new, single M4B file with all your custom metadata safely embedded inside!

Pro Tip:If you have an existing M4B file with the wrong thumbnail or author, M4Bindr makes it easy to update audiobook tags. Even if you only need to insert cover art into an .m4b file without rebuilding chapters, simply import that single file. Because M4Bindr creates a brand new container every time, you will need to input all the details (title, author, and your new cover) completely afresh. Once filled out, tap Bind, and it re-wraps the file instantly with your new artwork and tags!

Enjoy a Beautiful Library

Once the binding process is complete, export the final M4B to your favorite audio player. It will show up with the correct title, author, and stunning cover art. Taking a few extra seconds to add proper metadata makes your personal audiobook collection feel premium and professionally organized.