MP4 to AAC Converter

Save the audio from any MP4 as a small, high-quality AAC file. Free, in your browser, with no signup and no watermark.

Select MP4 file →

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Click or drag and drop to upload files

We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

Most MP4 videos already carry their sound as AAC, so saving it as a standalone AAC file gives you the audio with none of the video weight. EchoWave drops the picture and hands back a small, efficient AAC track that plays on phones, streaming apps, and most modern players, free and right in your browser with no signup.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert MP4 to AAC

1
Upload your MP4
Drag your MP4 onto the converter or pick it from your device. Nothing to install.
2
Choose AAC and convert
Select AAC as the output, set the bitrate if you want, then start. Free, with no sign-up.
3
Download your AAC
Save the finished AAC to your device, or open it in the editor to trim or reuse it.

Try it

Estimate your AAC

Pick a bitrate and a length to see the AAC file size before you convert.

Bitrate

Length10 min

1 min60 min

Estimated AAC size14MBGreat for most music

An estimate. Real size varies a little with the encoder and the audio itself.

The formats

MP4 vs AAC

MP4

MPEG-4 Part 14

The video format that plays everywhere

Type: Video container
Holds: H.264 video plus AAC audio, sometimes subtitles
Typical size: Large, it carries video
Plays on: Phones, browsers, TVs, almost any player

Best for:Watching and sharing video

AAC

Advanced Audio Coding

The lossy codec that succeeded MP3

Type: Lossy audio format
Holds: AAC audio only
Typical size: Small, efficient at low bitrates
Plays on: Phones, browsers, YouTube, and streaming services

Best for:Streaming and mobile audio

Will it lose quality?

The AAC can only be as good as the audio already inside your MP4.
A bitrate higher than the source does not add quality, it only makes a bigger file.
192 to 320 kbps keeps music clear. 128 kbps is fine for speech.

Converting to AAC re-encodes the audio. To keep it exactly as it sits inside the video, convert to M4A instead, or to WAV for an uncompressed copy.

Use cases

What people use it for

PodcastersPublish a clean audio episode

Students & lecturesReplay recordings anywhere

MusiciansSave sets to listen offline

TranscriptionSend a small file, not a video

CommutersTalks and audiobooks on the go

Troubleshooting

If something looks off

The AAC has no sound

Some videos store audio as AC-3. The converter still handles it, but if a clip plays silent, re-download the source and convert again.

The file is too large to email

Convert at a lower bitrate, 128 kbps for talking, or trim the clip first to cut its length.

Which apps open AAC files?

Almost anything opens it: your browser, your phone, any music app, or VLC. No special player needed.

FAQ

MP4 to AAC questions

Is the MP4 to AAC converter free?

Yes. EchoWave converts MP4 to AAC with no signup, no file-count limit, no trial, and no watermark. Upload your video, convert it, and download the AAC file from your browser.

How do I convert MP4 to AAC?

Upload your MP4, choose AAC as the output, and start the conversion. When it finishes, download the AAC file to your device or open it in the editor to trim it first.

When converting MP4 to AAC, what is the difference between AAC and M4A?

AAC is the audio codec; M4A is a container that usually wraps an AAC track. A raw AAC file holds the audio stream on its own, while an M4A keeps the same audio inside an MP4-style container with richer tag support. They sound the same at the same bitrate.

Will converting MP4 to AAC lose audio quality?

The AAC can only be as good as the audio already inside your MP4, and a higher bitrate cannot add quality that was not there. Since most MP4s already store AAC audio, exporting at 192 to 256 kbps keeps it clear without bloating the file.

What plays the AAC files made from MP4?

AAC is the default audio for iPhone, iPad, Mac, and YouTube, and it plays on Android, in browsers, and in VLC. If a particular app refuses it, convert to MP3 instead for the widest possible support.

Does the MP4 to AAC converter work on iPhone and Android?

Yes. It runs in your mobile browser, so you can convert MP4 to AAC on iPhone, iPad, and Android with nothing to install.

Can I convert MP4 to AAC on Mac and Windows?

Yes. The converter works in any browser on macOS, Windows, Chromebook, and Linux. There is no software to download and no account to create.

Can I convert several videos one after another?

Yes. There are no file-count limits on these pages, so you can convert your MP4s one after another. Large videos are supported and simply take a little longer to upload and convert.

Is it safe to convert MP4 to AAC here?

Pulling the AAC track out of an MP4 is a low-risk job, and you can do it without making an account or installing an app. For the specifics on how your uploaded video and the AAC it produces are handled, read our security page.