100% local processing · Free

A free app to extract & convert audio from video

An app that pulls just the audio out of your video, with lossless extraction and conversion. Extract AAC to .m4a losslessly (no re-encode), plus WAV, AAC and MP3 conversion. No upload — it all runs in your browser.

Drop a video / tap to choose
Supports MP4, MOV (AAC audio) · Free, as many as you like
Nothing is uploaded — everything is processed inside your browser

📖How to use

1

Choose a video

Drag and drop, or tap to choose, the video (MP4, MOV) you want to extract audio from.

2

Choose a format

For untouched quality, pick “Lossless extract (.m4a)”. For broader compatibility, you can also convert to WAV, AAC, or MP3.

3

Press the button

All processing happens inside your browser. Lossless extraction finishes in an instant.

4

Download

Once it's done, download it. On iPhone, you can “Save to Files” from the share sheet.

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❓Frequently asked questions

Is it really free?
Yes, it's completely free to use. No sign-up required.
Are my videos uploaded to a server?
No. All processing happens right in your browser, so your videos are never sent to a server and your privacy is protected.
What is lossless extraction?
Instead of decoding the AAC audio in the video and converting it to another format, it copies the audio as-is and pulls it out. Because there's no recompression, quality doesn't drop by a single byte, and the process finishes instantly. The output is .m4a (AAC).
Can I save as MP3?
Yes, MP3 conversion is supported. However, turning AAC into MP3 involves recompression, which degrades quality — so if you want to keep the sound untouched, lossless extraction (.m4a) is recommended. You can choose WAV, AAC, or MP3 depending on your needs.
Can I extract audio from a .mov shot on my iPhone?
Yes. An iPhone .mov contains AAC audio, so it's a great match for lossless extraction (.m4a). You can also use it in your iPhone's browser.
Which video formats are supported?
Lossless extraction is supported for MP4 and MOV (ISOBMFF) with AAC audio. Conversion to WAV, AAC, or MP3 works for any format your browser can decode.
Can I turn up / increase the volume of a video?
Ototori is an audio extraction and conversion tool, so it can't raise the volume itself. To boost loudness or volume, use our sister tool Otoatsu. You can also extract the audio here first, then make it louder in Otoatsu.
Can I remove/mute the audio from a video?
No. Ototori extracts and converts audio from video; it can't export a silenced (muted) video. If you need a video with the audio removed, please use video-editing software.
Can it fix audio sync or replace the audio?
Ototori doesn't handle audio-sync correction or replacing/adding audio — those belong to video editing. What Ototori does is extract audio from your video and convert it to WAV, AAC or MP3.
Can I remove a specific voice / reduce noise?
It doesn't do the source separation needed to remove a single speaker. If you want to reduce noise in the audio, please use our sister tool Shizuka (AI noise removal).

📚What to know about extracting audio from video with no quality loss

Lossless extraction is its biggest strength

Ototori copies the AAC audio inside your video as-is — with no re-encoding — and writes it out as .m4a. Where typical converters rebuild the audio into MP3 or WAV (recompressing it and lowering quality), Ototori doesn't change a single byte of the original sound. It's also done in an instant and handles long videos with ease.

Runs in your browser, so privacy is safe

Your video files are never sent to a server. Because everything is processed inside your browser, you can extract audio with peace of mind even from confidential, personal, or private videos. No sign-up and no installation required.

Why quality drops when you go to MP3

The audio in videos is almost always AAC. Turning AAC into MP3 requires decompressing it and rebuilding it, and this “recompression” always degrades quality. If you want to keep the sound untouched, .m4a (AAC) is the right output. Conversion to MP3, WAV, and AAC is available too, but since these involve recompression and conversion, lossless (.m4a) extraction is best when quality comes first.

A perfect match for iPhone .mov

A .mov shot on an iPhone contains AAC audio, so it's a great fit for lossless extraction (.m4a), and on iOS it works right away in Music and various apps. It runs in iPhone Safari too, and when it's done you can “Save to Files” from the share sheet.

Four outputs to fit your needs

For top quality, choose lossless (.m4a); for editing material or reliable playback, WAV; to make it smaller, AAC (.m4a); and when you want the most universal format, MP3. Pick what suits your goal. It also shows details like codec, bitrate, and sample rate, so you can check what's inside before exporting.