Step 1: Supply your MP4 files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted M4A files.
MP4 to M4A Conversion FAQ
How do I extract the audio from a MP4 as M4A?
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Upload the MP4 file and the converter demuxes the audio track, then re-encodes it as M4A. No re-encoding of the video happens — only the audio stream is processed, which keeps it fast even on long videos.
Will the audio quality match the original MP4 track?
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Yes — the audio is extracted at the source bitrate where possible. If you pick a higher M4A bitrate than the source, the file will not improve in quality, just grow in size.
Is the MP4 to M4A conversion reversible?
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You can convert the M4A back to MP4 on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
What output quality should I expect from MP4 to M4A?
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Default settings target broadcast / web quality — visually identical to the source for most viewers. For archival use, pick the highest quality option in the converter settings.
Is converting MP4 to M4A a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the M4A encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the M4A from that instead avoids the double pass entirely. Almost every MP4 in the wild is H.264 video with AAC audio; the container also legally holds HEVC, AV1 and VP9. An M4A holds AAC in most cases, or Apple Lossless (ALAC) when it came from a lossless rip.
Can I tag the M4A with artist and album information?
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Yes, and it is a genuine gain over MP4, which has nowhere dependable to store any of it. M4A carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. M4A keeps rich iTunes-style metadata, chapters and artwork intact, and is the native audio format across every Apple device.
Is there a file-size limit when converting MP4 to M4A?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several MP4 files to M4A at once?
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Yes. Drop or pick multiple MP4 files in one upload — the converter processes them in parallel and returns a ZIP of the M4A results. There is no need to repeat the upload step per file.
What happens to my MP4 files after the conversion?
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Uploaded files and M4A outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
What apps can play a M4A file?
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M4A plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
Do I need to install software to convert MP4 to M4A?
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No. The converter runs entirely in your browser plus our cloud — no plugin, no install, no admin rights. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.
Do I need an account to convert MP4 to M4A?
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No. MP4 to M4A conversion is free and works without an account. Signing in unlocks higher file-size caps, batch history, and API access.
