MP4 to M4A Converter
Need the soundtrack without the video? Convert MP4 to M4A locally for Apple Music, podcasts, and voice-over workflows — no watermark.
Choose a file or drag and drop
Drop your MP4 file here or
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- Processed on your device
- No conversion file stored on our servers
- Maximum file size: 100 MB
Conversion runs in your browser. Files are not uploaded to Format Convertly servers.
Processed on your device
No conversion file stored on our servers
Conversion Settings
Customize the output to match your needs.
Convert Quality
92%Output
Output options for this format are applied automatically during browser conversion. Drop your file above to begin.
Advanced settings
Additional Options
Quality or bitrate forces a re-encode. Width/FPS apply only when creating GIF or animated WebP.
How to Convert MP4 to M4A
Open the MP4 → M4A converter
Open the MP4 to M4A converter on Format Convertly.
Add your MP4 file
Add your MP4 in the browser.
Download M4A
Optional: convert again to MP3 if a recipient’s device rejects M4A.
Why Convert MP4 to M4A?
Private by design
MP4 → M4A runs in your browser. Files are not uploaded to a remote conversion queue.
Ready for the next step
Convert when a site, editor, or teammate expects M4A instead of MP4.
Practical quality
M4A: lossy (usually AAC). Lossy targets trade size for speed — preview when it matters.
Wide compatibility
MP4 is commonly used for Social uploads and Website video.
MP4 vs M4A
A quick side-by-side before you convert — deeper comparison lives on the full guide.
| Feature | MP4 | M4A |
|---|---|---|
| Kind | multimedia container | audio |
| Compression | lossy (codec-dependent) | lossy (usually AAC) |
| Lossy / lossless | Typically lossy | Typically lossy |
| Transparency | Not supported / N/A | Not supported / N/A |
| Best for | Social uploads; Website video | iPhone voice memos; AAC music purchases/downloads |
| Typical size | Large vs audio; efficient vs uncompressed video | Smaller than WAV; often similar to or slightly smaller than MP3 at the same bitrate |
| Browser / web support | Excellent HTML5 video support | HTML5 audio in Chromium, Safari, and Firefox for AAC/M4A |
| Compatibility | The default video container for phones, social platforms, smart TVs, and HTML5 players — safest modern delivery choice | Excellent on Apple devices and modern players; a minority of older hardware still lists MP3 more reliably than M4A |
Choose MP4 when…
- Social uploads
- Website video
- Phone playback
- Client delivery from editors
Choose M4A when…
- iPhone voice memos
- AAC music purchases/downloads
- Podcast audio in Apple workflows
- Extracted audio from MP4
What happens to video quality?
Both MP4 and M4A are typically lossy. A second encode can add generation loss — preview when fidelity matters. Changing MP4 to M4A re-encodes the media in the browser. It is not a lossless remux unless both sides share the same codec and container. MP4: MP4 itself does not define visual quality — H.264/H.265/AV1 and audio bitrates do. Re-encoding can reduce quality; remuxing keeps bitstreams when formats allow. M4A: M4A compression: lossy (usually AAC). Lossy encoding discards some information to shrink files — re-saving repeatedly can accumulate artifacts. Typical size profile: Smaller than WAV; often similar to or slightly smaller than MP3 at the same bitrate. Quality note: Typically AAC inside; quality depends on bitrate (128–256 kbps is common for music).
Tip
M4A is ideal inside Apple ecosystems; MP3 still wins some older decks.
Does MP4 to M4A reduce quality?
M4A is typically lossy (lossy (usually AAC)). Use a higher bitrate when fidelity matters, and keep the MP4 master for archival.
M4A format guide →Should I keep the original MP4?
Yes when you may need to re-encode later. MP4: MP4 is the safest video delivery format for phones, web, and social platforms. Shoot or edit in whatever your camera prefers, then provide an MP4 derivative for sharing.
MP4 format guide →MP4 · M4A
Related converters MP4
Related converters M4A
Frequently Asked Questions
More on quality loss: conversion quality guides · problem-solution guides
Does converting MP4 to M4A reduce quality?
It can — both sides are typically lossy. A careful encode may look similar; repeated re-encodes cause generational loss. Prefer converting once from the best master you have.
Can you recover quality after converting?
Not from a lossy output alone. Return to the original master (or a better source). Converting to a lossless format does not resurrect discarded detail.
What is generational loss?
Damage that stacks when you decode and lossy-encode the same file over and over (for example JPG→edit→JPG). Edit from masters and export delivery formats once.
Where can I learn more about conversion quality?
Browse Format Convertly’s Quality guides for topics like whether conversion reduces quality, JPG↔PNG myths, WebP/MP3/MP4 tradeoffs, recovery limits, and generational loss — each links to the right converter.
Does MP4 to M4A remove the video?
Yes. The output is an audio-only M4A suitable for music apps and podcast tools.
Is M4A the same as AAC?
M4A is the container; AAC is usually the codec inside. People say M4A colloquially for AAC audio files.
Will chapter markers survive?
Simple extractions audio focuses on the soundtrack. Advanced MP4 metadata may not round-trip — verify if you rely on chapters.
What is a MP4 file?
MP4 is a ubiquitous multimedia container usually holding H.264/H.265 video and AAC audio. MP4 is the safest video delivery format for phones, web, and social platforms. Shoot or edit in whatever your camera prefers, then provide an MP4 derivative for sharing.
Ready to Convert Your Files?
MP4 to M4A privately in your browser.