Convert MP3 to M4B online and turn audiobooks into Apple Books files with chapters and covers kept. Upload files up to 20GB and download the converted result in a few clicks.
Convert M4B to MP3Drag & Drop your MP3 file here
MP3 files, up to 20GB
Files stay private.
Automatically deleted after 24 hours.
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20GB upload limit.
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Trusted for 1,827,796+ conversions
HOW IT WORKS
Three steps, no account, nothing to install.
01
Upload the MP3
Drag and drop your MP3 audiobook or select it from your device. Each MP3 becomes its own M4B.
02
Convert to M4B
Keep M4B as the output and start. The audio is encoded as AAC and the file is marked as an audiobook.
03
Download the M4B
Save the M4B when it is ready, or download several books together as a ZIP.
MP3
MP3 is a lossy compressed audio format built for small files and broad playback compatibility. It works on almost every phone, browser, car stereo, media player, and editing application.
M4B
M4B is the audiobook form of the MP4 audio format: AAC audio with chapters, cover art and book details in one file. Apple Books and iTunes list M4B files under Audiobooks, and many audiobook player apps read their chapters.
FILE FORMATS
SOURCE
MPEG-1 Audio Layer III has been the universal music format since the 1990s. It compresses audio by removing sounds the ear is unlikely to hear, so a song takes a few megabytes instead of tens. ID3 tags carry the title, artist and album art, and every phone, browser, car stereo and editor plays it.
TARGET
M4B is the audiobook version of M4A. The audio is AAC, but players treat it as a book: Apple Books and iTunes file it under Audiobooks, remember where you stopped, and show chapter marks, the author and the cover. Audible downloads and many audiobook tools use it.
| Feature | MP3 | M4B |
|---|---|---|
| Developed by | MPEG (Fraunhofer) | Apple |
| File extension | .mp3 | .m4b |
| Compression | Lossy | Lossy (AAC) |
| Size vs uncompressed WAV | About 1/7 to 1/10 | About 1/10 or less |
| Tags and cover art | ID3 tags and cover art | Chapters, tags and cover art |
| Best for | Music and podcasts everywhere | Audiobooks with chapters |
| Plays on phones and browsers | Yes | Apple Books; many audiobook apps |
USE CASES
Practical workflows where MP3 to M4B conversion is useful.
Move an MP3 audiobook into Apple Books
Apple Books treats the M4B as an audiobook, not a song, so it sits with your other books instead of in your music.
Keep chapter marks from the MP3
Chapter marks in the MP3 become M4B chapters, so you can jump between them in the player.
Publish a self-made audiobook for Apple listeners
Authors who produce a book as one chaptered MP3 can make an M4B for listeners on Apple devices.
Listen to a recorded course as a book
A lecture series or course saved as one MP3 becomes an M4B, so the player lists it as a book.
Keep chapter titles in any language
Chapter titles in non-Latin scripts carry over to the M4B.
Keep mono narration mono
Mono narration stays mono and is encoded at 64 kbps AAC, a rate suited to speech; stereo books get 128 kbps.
Use an audiobook player app
Audiobook apps that read M4B chapters show the book's chapter list from the converted file.
Turn a radio drama into an audiobook
Long radio plays or dramatized readings saved as MP3 become an M4B, with stereo kept at 128 kbps.
Organize a language course
Language lessons saved as MP3 can live in Apple Books next to your other audiobooks.
Keep the cover and author in your library
Title, author and the front cover are kept, so the book looks right in Apple Books and iTunes.
SUPPORTED FILES
MP3 audiobooks and long spoken-word recordings are supported.
ID3 chapter frames become M4B chapters, including non-Latin titles.
A long MP3 without chapters becomes one M4B with no chapters.
Title, author and cover art carry over.
Long recordings you want to resume where you stopped.
Upload a few MP3s and download the M4B files as a ZIP.
TROUBLESHOOTING
Audiobook apps rely on tags and chapters, which explains most surprises.
01
Chapters only come from ID3 chapter marks in the MP3. If the MP3 has none, the M4B has none.
02
Each MP3 becomes its own M4B. Join the parts into one MP3 first for a single book.
03
Import the M4B through Apple Books, or check the file kept its .m4b extension.
04
Only a cover embedded in the MP3 carries over.
05
Set the artist tag in the MP3 before converting.
06
Check the MP3 plays normally. A damaged file stops with a short message.
Audacity, foobar2000, fre:ac and Apple's Music app can all convert audio once they are installed and set up. dragdropdo is built for turning MP3 into M4B quickly, from any device.
| What matters | dragdropdo | Desktop Audio Converters |
|---|---|---|
| Nothing to install | ✓Yes. Runs in any modern browser. | ~Yes, a download, and sometimes an extra encoder or codec. |
| Works on phones and tablets | ✓Yes. Desktop, Android, iPhone and iPad. | ~Mostly desktop only. |
| Batch conversion | ✓Yes. Add many files and download one ZIP. | ~Varies. foobar2000 and fre:ac batch well; Audacity needs macros. |
| Share finished files | ✓Yes. Send a unique link from the result page. | ~You upload and share the files yourself. |
| Pricing | ✓Free with daily limits. $2.99 or $6.99 passes for unlimited use, no monthly plan. | ~Mostly free (Audacity, foobar2000, fre:ac). |
| Choosing bitrate and settings | ✓Fixed, high-quality settings chosen for M4B. | ~Yes. Most let you choose bitrate, sample rate and channels. |
Other tools use different pricing, limits and workflows. This comparison describes dragdropdo's own features without assuming every other tool works the same way.
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WHY DRAGDROPDO
Convert MP3 to M4B in your browser, with nothing to install and nothing kept after 24 hours.
Private by default
Files are encrypted in transit and deleted from our servers automatically after 24 hours.
No install required
Convert in any modern browser on Windows, Mac, Linux, Android, iPhone or iPad. No app and no sign-up wall.
Big files and batches
Upload files up to 20GB each, add several at once, and download the results one by one or as a ZIP.
Share & download
Save finished files to your device or pass them on with a share link from the result page.
MORE MP3 TOOLS
MP3 is a popular audio file format known for its efficient data compression and relatively high quality, making it ideal for music and audio streaming. Widely used for music downloads and digital media, MP3 files maintain a balance between sound quality and file size, ensuring quick downloads and easy sharing across platforms and devices.
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FAQ
Answers to common questions about dragdropdo's MP3 to M4B converter.
