Step 1: Attach your MP4 files using the button above or by bring and position.
Step 2: Click the 'Optimize' button to start the optimization.
Step 3: Collect your converted M4A files.
MP4 to M4A Optimization FAQ
How do I extract the audio from an MP4 file as M4A?
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Upload the MP4 file and we demux the audio track, then transcode it to M4A. There is no second video pass and no quality loss beyond what the M4A codec itself introduces.
What audio bitrate does the M4A file use?
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A lossy M4A is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless M4A (WAV, FLAC) ignores the bitrate and keeps every sample.
Will I lose audio quality going from MP4 to M4A?
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If M4A is lossless (WAV, FLAC), every sample is preserved exactly. If M4A is lossy (MP3, AAC, OGG, Opus), the M4A codec recompresses — at 192 kbps this is transparent for almost all content. Recovering quality that was already gone in the MP4 source is impossible.
Does the extracted M4A keep the original sample rate?
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By default yes — a 48 kHz audio track in MP4 becomes 48 kHz in M4A. If you need 44.1 kHz (CD-quality) for compatibility with older players, the advanced options expose a sample-rate dropdown that resamples with a high-quality filter.
Can I extract audio from multiple MP4 files to M4A in one batch?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
How long does extracting M4A from an MP4 file take?
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It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.
Can I extract just a section of the MP4 audio as M4A?
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Not in this single tool — extract the full audio as M4A here, then use /audio-trim/ or /audio-cutter/ to clip the section. The two-step path is faster than a combined operation because we avoid re-decoding the whole file twice.
Is my MP4 file private during audio extraction?
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Yes. Uploaded MP4 files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted M4A are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
Why does my M4A file have silent gaps?
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Usually the MP4 carries more than one audio track and the one that was converted is silent or secondary. The converter picks one audio track automatically, normally the main one, and this page has no setting to choose a different track. If the wrong one comes out, remux the MP4 with the track you want first (VLC or ffmpeg can do this) and convert it again.
Does the extracted M4A play on iPhone / Android / car stereo?
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MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. OGG and Opus need a recent player on iOS but play in Chrome, Firefox and VLC. There are no device presets on this page, so choose the target format your player supports.
