Extract Audio from Video
Save a video’s sound exactly as it is — or as MP3 or WAV — without uploading anything.
Details from the file
Files
Save the sound as
What you will get
Output
Working…
Your audio
Change the settings above and run it again to try another version; the original stays open.
About the Extract Audio from Video
Take the sound track out of a video exactly as it is: the compressed audio is copied into an audio file without being decoded or re-encoded, so the quality is identical to the video’s and it takes seconds even for a long film. Each codec goes into the file type that suits it: AAC → .m4a, Opus → .opus, MP3 → .mp3, Vorbis → .ogg, FLAC → .flac, PCM → .wav, and Dolby Digital (AC-3, E-AC-3) or DTS → .mka.
If the video has several sound tracks — languages, a commentary, a stereo and a surround mix — tick the ones you want and each becomes its own file. When you need a particular format instead, choose MP3 (with the bitrate you like) or WAV for editing software. Several videos can be processed in one go.
Everything happens in your browser; the video is never uploaded.
How to use it
- Drop a video on the box or press Choose videos (several at once to extract each one’s sound).
- Under Sound tracks, tick the track or tracks you want; each line says what file it becomes.
- Keep Original audio, no quality loss, or choose MP3 or WAV if you need that format.
- Press Extract audio, listen to the result and press Download (or Download all (ZIP)).
Examples
birthday.mp4 · H.264 video · AAC 48 kHz stereo
birthday.m4a · the same AAC sound, copied in about a second
film.mkv · track 1 English, AC-3 5.1 · track 2 Hindi, AAC stereo
film (track 1, English).mka and film (track 2, Hindi).m4a
The 5.1 track keeps all six channels in Matroska audio; choose MP3 if you need stereo for a phone.
take3.mov · PCM 16-bit big-endian
take3.wav · the same samples, rewritten in WAV’s byte order
lecture.webm · Opus mono
lecture.mp3 · 128 kbps CBR mono
Copying versus converting
A video file keeps its sound as a separate stream of compressed packets. Copying moves those packets unchanged into an audio container, so the result is bit-for-bit the sound the video plays, and only as long as reading the file takes. Converting decodes the sound and encodes it again: useful when a device needs MP3 or software needs WAV, but a second lossy encode (for MP3) costs a little quality and time.
An AAC track copied out of an MP4 keeps its original encoder-delay information, so it starts exactly where the video’s sound starts. PCM tracks from QuickTime files are often big-endian; WAV stores little-endian samples, so their bytes are reordered — the values do not change.
Which file you get, and what plays it
- .m4a (AAC): iPhone, Android, Windows, macOS, iTunes/Music and almost every player.
- .opus (Opus in Ogg): browsers, Android, VLC and most modern players.
- .mp3: everywhere.
- .ogg (Vorbis): browsers, Android, VLC and most desktop players.
- .flac: lossless; Android, Windows, macOS, the iPhone Files app and most players.
- .wav (PCM): every editor and player; large.
- .mka (Dolby Digital, E-AC-3, DTS): keeps surround tracks untouched; VLC, mpv, Kodi and foobar2000 play it. For phones, choose MP3, which mixes the surround channels to stereo (ITU-R BS.775).
Limitations
- Tracks in codecs browsers cannot read — Apple Lossless (ALAC) outside Safari, Dolby TrueHD, WMA — cannot be copied or converted here; the page names the codec.
- Old containers (AVI, WMV, FLV, MPG/VOB) cannot be opened in a browser, and DRM-protected videos cannot be read at all.
- Subtitles, chapters and the picture are not included: only the sound tracks you tick.
- An AAC track copied from a Matroska (MKV/WebM) file keeps the encoder’s few milliseconds of start-up silence, which the MKV player skipped.
- Converting to MP3 or WAV takes longer than copying, and very long videos need memory, especially on phones.
Privacy
Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot. The audio engine (and, for MP3, the LAME encoder) downloads from MySmartCoPilot the first time you use it. Your videos are never uploaded.
Frequently asked questions
Does extracting reduce the quality?
Not with Original audio, no quality loss: the compressed sound is copied as it is. Only MP3 re-encodes it; WAV decodes it to uncompressed samples without further loss.
Why did I get an .m4a and not an MP3?
Because the video’s sound is AAC, and .m4a is the file type for AAC. Copying it keeps the quality exactly. If you need MP3, choose MP3 under Save the sound as, or use MP4 to MP3 for tags and cover art.
The video has two languages. Can I get both?
Yes. Tick both tracks: each becomes its own file, named with the track number and language, and you can download them together as a ZIP.
What is an .mka file?
Matroska audio: the audio-only form of MKV. It holds Dolby Digital and DTS surround tracks without changing them. VLC, mpv, Kodi and foobar2000 play it; for phones and car stereos, convert to MP3 instead.
How long does it take?
Copying is about as fast as reading the file: seconds for most videos, even long ones. Converting to MP3 or WAV decodes all the sound, which takes longer.
Is my video uploaded?
No. The video is read and processed in your browser; only the tool’s code is downloaded the first time.