Queue M4A audio
Choose one or more non-empty .m4a files up to 100 MB each. Each queue row keeps its own playable source audio preview.
Free online M4A to MP4 converter
Create AAC MP4 audio files from M4A.
Queue M4A files, make a new AAC MP4 from the first audio stream, then listen to and download every completed result.
- Files not stored
- Queue M4A files
- 100 MB each
Processed by our self-hosted conversion engine
Supported files
M4A in. MP4 out.
M4AMP4
Add M4A audio files up to 100 MB each. Fileverses creates a new MP4 result with this route’s documented conversion profile; review the completed download before using it elsewhere.
How it works
One queue. A new MP4 file.
Create AAC MP4 audio
Start the queue to have FFmpeg map the first audio stream from each M4A and encode it as a new AAC MP4 audio file.
Listen and download
Inspect every completed MP4 audio result in the queue, then download that separately named file.
Limits and quality
A new MP4 file, with source-specific trade-offs.
Each result is a newly encoded AAC audio-only MP4, not a copied M4A stream. Its size and audible result depend on the source and encoder, and encoding cannot restore earlier audio detail.
Convert M4A nowM4A sources with audio
This route accepts non-empty .m4a files up to 100 MB each. The selected file must be readable by the host FFmpeg installation and have an audio stream.
New AAC MP4 audio
Each result is a newly encoded AAC audio-only MP4, not a copied M4A stream. Its size and audible result depend on the source and encoder, and encoding cannot restore earlier audio detail.
First audio stream only
The profile maps only the first audio stream, removes source metadata and chapters, and excludes video. It does not preserve alternate audio tracks, subtitles, attachments, original codecs, or metadata, and has no trimming, sample-rate, channel, or bitrate controls.
M4A to MP4 FAQ
Questions, answered.
What M4A files can I convert to MP4?+−
This converter accepts non-empty .m4a files up to 100 MB each. FFmpeg must be able to read the M4A and find an audio stream for conversion to succeed.
What does the downloaded MP4 contain?+−
A successful result is an audio-only MP4 with newly encoded AAC audio. It contains only the first audio stream from the M4A.
Can I convert several M4A files at once?+−
Yes. Add multiple supported M4A files to the queue. The browser submits one real server-side conversion at a time, and every successful row receives its own MP4 audio player and download button.
Will the MP4 be smaller or recover original quality?+−
No size or quality recovery is guaranteed. AAC encoding creates a new compressed file, so the final size and audible result depend on the source and encoder output.
Does this keep alternate audio tracks or metadata?+−
No. The profile maps only the first audio stream, removes source metadata and chapters, and excludes video. It does not promise alternate-track, subtitle, attachment, original-codec, or metadata preservation.
Can I choose MP4 settings or trim the audio?+−
No. This route has no trimming, stream-selection, sample-rate, channel, bitrate, or quality controls. It uses its fixed AAC MP4 audio profile.
Are files kept after conversion?+−
Each source and output exists in a temporary server directory only while its conversion runs. The directory is removed whether the job succeeds or fails.