How to Convert a Video to MP3 on iPhone

Search for this and you will find a hundred pages promising a one-tap iPhone video-to-MP3 conversion. Most of them are quietly wrong about one detail, and it is the detail that matters.

iOS does not have an MP3 encoder. Apple’s media frameworks decode MP3 perfectly well, but they cannot create one. That is why every on-device tool on iPhone, including the built-in Shortcuts action and including our own app, gives you M4A, WAV, or AIFF instead.

So the real question is not “how do I get an MP3.” It is “do I actually need one.”

The short answer

For almost everybody: extract the audio as M4A and stop thinking about it. It will play on your phone, your laptop, your car, your speaker, and anything you send it to.

Here is how to do that, in about ten seconds.

Getting the audio out (M4A)

Using Shortcuts, free and built into iOS. Create a shortcut with the Encode Media action, expand it, turn on Audio Only, leave Format on M4A, and add a Save File action. Enable it in the share sheet under Details. Then share any video to it. We wrote the full step-by-step in how to extract audio from a video on iPhone.

Using Decant. Drop in a video, get the audio back, keep the original filename. It runs entirely on your iPhone, handles batches, and exports M4A, WAV, or AIFF. First three are free, then $4.99 once.

Either way, you end up with an M4A file in a few seconds without anything leaving your phone.

Why M4A is the better file anyway

M4A is a container holding AAC audio. AAC is roughly a generation newer than MP3 and it shows: at the same bitrate it sounds cleaner, and at the same perceived quality it produces a smaller file.

It is also not some niche Apple format. M4A plays natively on:

• Every iPhone, iPad, and Mac
• Android, since forever
• Windows, natively since Windows 7
• VLC, Plex, Sonos, and every modern media player
• Any car stereo built in roughly the last fifteen years

The reason people ask for MP3 is momentum, not compatibility. MP3 won the format war in 1999 and the name stuck.

When you genuinely need a real MP3

There are real cases. If you hit one of these, you need an actual MP3 and no amount of arguing about codecs helps:

• Older car stereos and MP3-CD players. Anything that predates roughly 2010 may only read MP3 and WMA.
• Podcast hosts and radio submission forms. Some still hard-require MP3 on upload.
• DJ software libraries. A few older setups index MP3 only.
• Legacy corporate or government upload portals. These reject anything unexpected, and arguing with them is not productive.

How to make a real MP3

Do it on a computer. This is the one part of the job where a desktop genuinely beats a phone.

• VLC (free, Mac/Windows/Linux): Media → Convert/Save, add your file, pick the “Audio - MP3” profile, and save.
• Audacity (free, Mac/Windows/Linux): open the file, then File → Export → Export as MP3.

Both are free, both run locally, and neither uploads your audio anywhere.

You will also find plenty of web-based converters. They work, but they mean uploading your audio to someone else’s server. For a clip off the internet that is fine. For anything personal, use the desktop route.

One quality note. The audio inside a video file is already lossy. Converting it to MP3 adds a second round of lossy compression on top of the first, and the damage compounds. If you have to produce an MP3, encode it once, from the best source you have, at a healthy bitrate (192 kbps or higher). Do not convert an M4A that you made from a video that you downloaded, and then convert that again.

What about MP4 to MP3?

Same thing. MP4 is a video container, and the audio inside it is almost always AAC. “Converting MP4 to MP3” means extracting that AAC track and re-encoding it to MP3, with the quality cost described above.

Extracting it to M4A instead is faster, keeps the audio closer to the original, and skips a lossy generation entirely, because the AAC data can be carried across largely intact.