How to Convert Video to Audio on iPhone

Plenty of things arrive as video when the only part you want is the sound. A recorded lecture. A conference talk somebody filmed on a tripod. An interview you conducted over a video call. A song you played at a wedding. A two hour podcast that exists as a video because that is how the studio records it.

Keeping the video costs you storage you do not need, stops you listening with the screen off, and makes the file awkward to send. Converting it to audio fixes all three, and on an iPhone it takes about fifteen seconds once you know where to tap.

The mechanics are simple. The decision underneath them is where quality is won or lost, so I want to cover that properly rather than just listing steps.

What is actually happening inside the file

A video file is a container holding at least two separate streams. A video stream, usually H.264 or HEVC, and an audio stream, usually AAC. They sit side by side with timing information telling a player how to line them up.

That means the audio you want already exists as a complete, self contained stream. It is not woven into the picture and it does not need to be reconstructed. Getting it out is a matter of copying that stream into a new container and discarding the video.

This has a consequence that most articles on the subject miss entirely. If you keep the audio in its original AAC form and put it in an M4A container, nothing is re-encoded. The sound in your audio file is bit for bit identical to the sound in the video. Zero quality loss.

If instead you ask for MP3, the AAC has to be decoded and then re-encoded into a different lossy format. That is a second generation of lossy compression on top of the first, and it makes things slightly worse. Usually not dramatically, and never better.

So which format should you pick

The rule I use is simple.

Choose M4A when the audio is going to stay in your world. Listening on your iPhone, keeping it in Files, sending it to somebody with an Apple device, feeding it to a transcription service, or archiving it. M4A keeps the original quality untouched, and everything Apple makes plays it without complaint. Most modern software does too.

Choose MP3 when the destination is old, unknown or fussy. A car stereo from 2011. A gym treadmill with a USB port. A colleague’s ancient work laptop.

A web upload form that lists accepted formats and MP3 is on the list. MP3 is universal in a way nothing else is, and the small quality cost is worth it when the alternative is a file that will not play.

The step by step for each is at converting an audio file to M4A on iPhone and converting audio to MP3 on iPhone.

What iPhone gives you natively

Honest answer first. There is no button anywhere in Photos, Files or Voice Memos that turns a video into an audio file. No Export As, no format menu, no hidden gesture. This is a genuine gap in iOS rather than something you are failing to find.

Apple’s Shortcuts app, which is already installed on your iPhone, does have the pieces. The Encode Media action includes an Audio Only option, and pointing it at a video file produces an audio file using the phone’s own media frameworks. If you enjoy building your own workflows, that is the action to start from, and it takes about four steps to make something usable.

I built Grabio because most people do not want to build a Shortcut. They want the thing to already exist.

Doing it with Grabio

Open the video in Photos or Files, tap the Share button, scroll the share sheet until you see Grabio, and tap it. Pick the audio extraction option from the menu, and the audio file comes back through the share sheet so you choose where it lands.

Save to Files if you want to keep it, send it, or feed it to something else. That is where I put everything, in a folder under On My iPhone, because Files gives you a real file with a real name that you can find again.

Grabio is free. There is no account, no paid tier, and nothing to upgrade to. It installs into Apple’s Shortcuts app rather than from the App Store, which means it appears in your share sheet rather than on your home screen.

There is a companion walkthrough with more detail on the mechanics at extracting audio from a video on iPhone.

Trim before you extract

This one saves real time and most people do it in the wrong order.

If you only need eight minutes out of a ninety minute recording, trim the video first and extract from the trimmed version. Trimming removes whole frames and leaves the rest untouched, so it costs nothing in quality, and the extraction then runs on a fraction of the material.

Open the clip in Photos, tap Edit, drag the yellow handles at either end of the filmstrip, tap Done, and choose Save Video as New Clip. That last choice keeps the original intact. The full walkthrough is at trimming a video on iPhone without an app.

Doing it the other way round means extracting ninety minutes of audio and then trying to trim audio on an iPhone, which is far more awkward than trimming video.

What the file size will look like

The reduction is dramatic and it is usually the reason people do this in the first place.

A one hour recording at 1080p might be 3 GB. The AAC audio inside it is typically running at 128 to 256 kilobits per second, which works out at roughly 55 to 110 MB for the hour. So you are looking at something in the region of one to three percent of the original size.

That takes a file which will not attach to an email and turns it into one that will. It also means an hour of lecture audio costs you almost nothing on a phone, where the video version would have been a real decision.

Do not expect the audio file to shrink further with compression. It is already compressed, and running it through another encoder mostly costs quality.

Living with the audio afterwards

A friction point worth naming, because it surprises people. Getting an audio file into the Music app on an iPhone is genuinely awkward. Apple has never made a clean import path on the device, and the routes that exist involve a computer.

What works well instead: the Files app has a perfectly good built in player, and it handles background playback, lock screen controls and AirPods. For lectures, interviews and anything you are listening to once, Files is the pragmatic answer and I have stopped fighting it.

If you want proper playlists and library behaviour, a podcast app that supports local files or a third party player is the realistic route. That is a real limitation of iOS rather than something a Shortcut can fix.

A note on where the video came from

If the video is yours, filmed by you, or something you have permission to use, everything above is straightforward.

If it came from a streaming platform, the extraction is the easy part and the entitlement is the question. Your own recordings, Creative Commons material and content where the creator has said yes are the clear cases.

Commercial music and paid content are not, whatever any tool makes technically possible. The longer version of that argument is at is it legal to download YouTube videos for personal use.

Get the Shortcut if you want the extraction step sitting in your share sheet. Free, no account, and it works on anything Photos or Files can hand it.

Frequently asked questions

Can I convert a video to audio on iPhone without an app?

There is no built in feature in Photos, Files or Voice Memos that does it. Apple’s Shortcuts app includes an Encode Media action with an Audio Only option, so a Shortcut handles it without any App Store install.

Does extracting audio from a video lose quality?

Not if you keep the original AAC stream and put it in an M4A container, since nothing is re-encoded. Converting to MP3 does add a second round of lossy compression, which is a small but real cost.

Should I choose M4A or MP3?

M4A when the file is staying on Apple devices or going to modern software, because it preserves the original audio exactly. MP3 when the destination is an older car stereo, a fussy upload form or a device you cannot test in advance.

How much smaller is the audio than the video?

Typically one to three percent of the original. A 3 GB hour of 1080p video usually holds somewhere between 55 and 110 MB of audio. That is the difference between a file that will not send and one that will.

Can I put the extracted audio into the Music app?

Not easily on the phone alone. Apple has never provided a clean on device import path. The Files app plays audio well, including background playback and lock screen controls, and is the practical answer for lectures and interviews.

Should I trim the video before or after extracting?

Before. Trimming video in Photos costs nothing in quality and is far easier than trimming audio on an iPhone afterwards. Cut it to what you need, save as a new clip, then extract from that.