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 Download and Archive Your Favorite Podcasts for Offline Listening

Learn how to permanently save multi-part podcasts into a single audiobook file. Protect your favorite series from being deleted by turning them into an M4B file on your iPhone.

Some podcasts are just too good to listen to once. Epic history series, limited-run true crime investigations, or deep-dive audio dramas often span dozens of episodes. But relying on your podcast app to keep those episodes available forever is a risky gamble.

Hosts often prune their old catalogs, move episodes behind a paywall, or switch hosting platforms entirely. If you want to keep your favorite audio series forever, the best approach is to download the MP3 files and merge them into a single, permanent "Audiobook Compendium."

The Problem with Saving Podcast MP3s

Most hardcore listeners know they can download the raw MP3 files directly from a podcast RSS feed or a creator's website. The issue arises when you try to listen to them later.

If you dump 25 episodes of a podcast into a music app, you will lose your playback position every time you pause to listen to a song. You will also clutter your music library with spoken word content. Podcasts are basically audiobooks, and they deserve to exist in a proper audiobook player.

The Solution: Bind Your Podcasts into an M4B File

By converting those loose MP3 podcast episodes into a single M4B file, you transform a messy playlist into a permanent, professional audiobook. The M4B format tracks your progress flawlessly, and it lives completely separate from your music inside the Apple Books app.

✓How to Archive Podcasts on iOS

Download the Episodes: Visit the podcast website in Safari and download the MP3 files to a folder in your Files app.
Import to M4Bindr: Open the M4Bindr app and add the downloaded MP3s. Check that they are in chronological order.
Add Cover Art and Bind: Search online for the official podcast cover art, add it to your project, give it a title, and tap Bind.

Keep It Forever

Once your M4Bindr file is ready, you can export it straight to Apple Books. Each original podcast episode becomes a neat, skippable chapter. Even if the original podcast disappears from the internet entirely, your favorite series is safely archived on your iPhone, ready for your next road trip or commute.