Convert MP4 to AAC.
Pull the soundtrack out of an MP4 video as AAC audio for players, editors and apps that expect AAC.
When you need just the sound
Lectures, interviews, music videos and screen recordings often matter for their audio alone. AAC keeps that audio small and widely playable.
Surround stays surround
A 5.1 soundtrack keeps its six channels in the AAC, and the bitrate rises to match. For a stereo file every device plays, choose MP4 to MP3.
Size change
At about 128 kbps for stereo, the AAC takes about 1 MB a minute, a small fraction of the video.
How it works
- 01
Upload your MP4
Drop a file or pick one from your device. Private by default.
- 02
Extract with ffmpeg
ffmpeg drops the picture and encodes the soundtrack as AAC at about 128 kbps for stereo.
- 03
Download
Grab your AAC.
About 128 kbps AAC for stereo
Keeps the original sample rate and channels
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Open-source ffmpeg engine
Extracting AAC from MP4
This pulls the audio track out of your MP4 and encodes it as AAC; the video is discarded. Audio quality is capped by what the original file contained.
Need more than a conversion?
Send your audio or video to TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items: automatically.
Common questions
Is it free?+
Yes. Convert MP4 to AAC free. No signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.
Is my file private?+
Your file is uploaded to a private bucket, converted on our own engine, and auto-deleted after 1 hour. It is never sent to a third-party converter.
Is the audio copied or re-encoded?+
It is re-encoded at about 128 kbps for stereo, even when the MP4's audio is already AAC. If the original track has a higher bitrate, that means a small loss. For an exact copy of the sound, use MP4 to WAV.
AAC or M4A?+
A .aac file is raw AAC audio with no tags or cover art. Choose MP4 to MP3 if you need a file that every player and car stereo accepts.
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