Pull the sound out of an MP4 or MOV and save it as an M4A — bit-identical to what was inside the source. Lossless, instant, and processed entirely on your device.
Most extract-audio tools quietly convert your audio to MP3, because users have been trained to expect that extension. But your video's audio isn't already MP3 — it's AAC, which is the standard for every modern MP4 and MOV file. Converting AAC to MP3 means decoding the audio and re-encoding it in a different codec, which takes time, eats a small amount of quality, and serves almost no real purpose: every player, app, music library and operating system released in the past fifteen years plays AAC and M4A natively. Including iTunes. Including the Music app on Android.
M4A is what your audio already is — Zimblu just gives it the right file extension and lets you download it. The bytes inside the M4A are the bytes that were inside your video. Nothing was decoded, nothing was changed, nothing was lost.
If you genuinely need MP3 — for a vintage car stereo, an old voice recorder, a website that demands it — use a separate converter on the M4A you get from here. We'd rather give you the lossless version and let you choose to take a quality hit, than impose one silently.
Both MP4 and M4A are containers — boxes that hold media tracks. Inside your video's MP4, there's a video track and an audio track. Zimblu reads the audio track's packets one by one and writes them into a fresh M4A container with no video track. No bytes inside any packet are decoded or modified. In our tests a 30-second 1080p clip extracts to a ~500 KB M4A in under a second, with the picture left untouched in your original file.
Because that's the audio that's actually inside your video. Modern MP4 and MOV files store AAC audio — M4A is just AAC with the right file extension. Saving as M4A is a container swap, instant and lossless. Converting to MP3 would require re-encoding, which costs time and a small amount of quality without any real benefit, since every modern player, including iTunes, the Music app, Windows Media Player, VLC and every phone, plays M4A natively.
Bit-identical. Zimblu copies the AAC packets out of the video container and into a new audio container without decoding them. The samples that come out are byte-for-byte the samples that were inside the source — same bitrate, same sample rate, same quality, just wrapped in a different file.
Essentially instantly. In our test runs, a 30-second 1080p clip's audio extracts in well under a second — most of the time is just the browser writing the resulting file to disk. There's no upload, no decoding and no encoding, so size barely matters: a 1 GB phone video extracts at the same speed.
It works on MP4 and MOV files with AAC or Opus audio, which is what virtually every phone, camera and screen recorder produces. If the file has no audio track at all, Zimblu tells you so up front rather than producing an empty result.
No. The whole extraction happens inside your browser, on your own machine. The file does not reach a server — you can disconnect from the internet after this page loads and the tool keeps working.
Drop the audio track from the video entirely — instant, no re-encode.
Mute →Cut to just the seconds you want — losslessly, in about a second.
Trim →Turn 90°, 180° or 270° in milliseconds.
Rotate →Strip GPS and capture date without touching the picture.
Clean →