Keep the audio you already have
When the destination accepts AAC in M4A, copying the existing track avoids another lossy conversion. It retains the encoded audio; it cannot repair noise or missing sound.
Understand extraction without re-encodingKeep your original AAC audio
Convert MP4 to M4A Online
Save the original AAC audio from a compatible MP4 as M4A. Extract and download on this device, without re-encoding or uploading your video.
MP4M4A
Local conversionAAC audio only · No re-encoding · One local MP4
Your media stays on your device.
Private by defaultLocal conversion without media uploads
Your MP4 stays on this device. The browser copies its compatible AAC audio into an M4A file that you can play and download. No registration or media upload is required.
How to extract M4A audio from an MP4
- 1
Choose a local MP4
Select a finished MP4 from your device, or drag it onto the converter on desktop. This page accepts one MP4 at a time and requires AAC in its first audio track.
- 2
Extract the original AAC audio
Click Extract M4A and keep the tab open. The converter checks the first audio track and copies compatible AAC without encoding it again. There are no quality settings to change.
- 3
Listen and download
Play the M4A result, then click Download M4A. Find the saved file in your browser’s downloads list. Download before resetting or closing this page.
When keeping AAC as M4A makes sense
Save audio without the video track
Create an audio-only reference from a compatible presentation, interview or personal MP4 recording. Video and additional audio tracks are not included in the result.
Use a format your destination accepts
M4A is useful in workflows that accept AAC audio, including compatible Apple apps. Check the receiving app’s requirements; choose MP3 if it specifically needs an .mp3 file.
Convert MP4 to MP3 insteadVerified MP4 to M4A support
- Input: MP4 (.mp4), verified with H.264 video and AAC audio.
- Audio selection: the first audio track must be AAC; later tracks are not searched for a match.
- Output: M4A (.m4a) containing the copied AAC audio, with no video track.
- Sample rate and channel count are kept from the source; no bitrate, resampling or channel controls apply.
MP4 audio extraction examples
- Keep the AAC narration from a compatible MP4 presentation.
- Save an audio-only copy of a personal video for an app that accepts M4A.
- Preserve a reference track before editing in software that supports the source AAC format.
MP4, M4A and AAC describe different things
MP4 is the source container
An MP4 can hold video and audio encoded in different ways. The extension does not guarantee AAC. This tool checks the first audio track and rejects incompatible original audio.
Learn about containers and codecsM4A is the audio-only output here
This page places the existing AAC track in an M4A container. It does not transcode other codecs to AAC or create ALAC audio. Renaming an MP4 to .m4a would not perform this extraction.
Choose M4A, MP3 or WAV for the task
M4A here keeps compatible AAC packets without re-encoding. AAC is compressed audio; copying it does not make the recording lossless or improve its quality.
Choose MP3 when a player requires that format or you need the available bitrate settings. AAC-to-MP3 adds a lossy encoding step.
Choose WAV when an editor requires 16-bit PCM. WAV usually uses more space and does not recover detail missing from the source.
M4A extraction limits
- Only MP4 input with AAC in the first audio track is supported here. Other codecs are rejected; the tool does not silently produce MP3 or Opus instead.
- HEVC/H.265 and other untested video combinations are not included in the verified H.264/AAC boundary.
- A video with no audio track cannot produce an M4A. A silent AAC track can be copied successfully but will remain silent.
- Input limits are 500 MiB on desktop and 200 MiB on mobile. Available browser memory can be lower; keep the tab open until extraction finishes.
- One file and the first audio track only. Trimming, batch processing and track selection are not available.
Frequently asked questions
Does MP4 to M4A change the audio quality?
For compatible AAC, it copies the encoded audio without re-encoding. There is no additional lossy encoding step, but the result keeps any compression, noise or silence already present in the source.
Will every MP4 work?
No. This page is verified with H.264 video and AAC audio in MP4. Its first audio track must be AAC. Files without audio, damaged files and incompatible codecs return an error.
Why are there no bitrate or quality controls?
This is original-audio extraction. Changing the bitrate, sample rate or channels would require a different processing mode. Use MP4 to MP3 for the available MP3 settings, or MP4 to WAV for PCM settings.
What if my MP4 contains Opus or multiple audio tracks?
The first audio track determines compatibility. If it is not AAC, this page rejects it even when a later track contains AAC. It will not return an Opus file under an M4A name. The error offers a link to MP4 to MP3; no fallback conversion starts automatically.
Is M4A the same as lossless audio?
Not necessarily. This tool keeps the AAC encoding already in the MP4. It does not create lossless ALAC or recover detail removed by earlier compression.
Can I extract M4A from a MOV instead?
Use Extract Audio from Video, select Original audio and choose a compatible H.264/AAC MOV. This dedicated page accepts MP4 only.
Where do I find the M4A download?
After clicking Download M4A, open your browser’s downloads list or the save location you selected. The result player alone does not save a file. Download before resetting or closing the conversion tab.
Is my MP4 uploaded to a server?
No. Media processing runs in a browser Web Worker on your device. The page fetches its conversion engine when you start extraction, but your video and output are not uploaded.