MP4 to MP3: extract audio from video
Pull the sound out of a video and save it as an audio file, all of it or just one part. It runs in your browser, so the video never leaves your device.
- 100% free
- Runs in your browser
- No uploads
- Runs on your deviceEvery tool works directly in your browser. No files are uploaded.
- Your privacy mattersYour files never leave your device, so there's nothing for us to store.
- No limitsUse any tool as much as you need. No daily caps, no waiting.
- Completely freeNo signup and no trial to cancel. Ads keep the tools free.
How to extract audio from a video
- Add the video. Drop an MP4, MOV, WebM or MKV file on the box, or choose it from your device.
- Pick a format. M4A is the best all-rounder. Choose WAV for editing software, or OGG for the smallest files.
- Optionally keep only part. Tick "Only save part of the sound", then drag the yellow handles or type the start and end times.
- Extract and download. Listen to the result on the page, then download it.
Which audio format to choose
| Format | Good for | Size for 3 minutes |
|---|---|---|
| M4A (AAC) | Phones, music apps, sharing. Lossless copy when the video's sound is AAC. | About 4 MB at 192 kbps |
| OGG (Opus) | Voice notes and podcasts where size matters most | About 2 MB at 96 kbps |
| WAV | Audio editors and DAWs, transcription tools that want raw audio | About 30 MB (stereo, 44.1 kHz) |
| MP3 | Old players and car stereos; only offered where the browser can encode it | About 4 MB at 192 kbps |
Sizes follow from the bitrate: 192 kbps is 192,000 bits each second, so 180 seconds is 34.6 million bits, or about 4.3 MB.
Common uses
- A song or speech from a phone video: M4A with "Same as the video" copies the sound exactly in a few seconds.
- One quote from a long recording: tick "Only save part", play the video and use "Start at player position" and "End at player position" to mark it.
- Audio for transcription or editing: WAV, so the editing app doesn't have to decode anything.
Common problems
- "Can't decode the sound": some cameras record Dolby (AC-3) or other sound that browsers can't read. Use Video info to see the format.
- The preview doesn't play: a few formats, such as some MKV files, can be processed but not previewed. Extraction still works.
- The file is bigger than expected: WAV is uncompressed. Pick M4A or OGG for small files.
Frequently asked questions
Why can't I pick MP3?
Browsers have built-in encoders for AAC (M4A) and Opus, but most have none for MP3, and this tool doesn't download extra software into your browser. When your browser does offer MP3 encoding, the MP3 option turns on by itself. M4A is the closest choice: it plays on iPhone, Android, Mac, Windows and in most apps that take MP3, and sounds as good at a smaller size.
Is my video uploaded?
No. The video is read and the sound is written inside this browser tab. Nothing is sent anywhere, which is why a 1 GB file works without waiting for an upload.
Does extracting the audio lower its quality?
Not with M4A and "Same as the video": when a video's sound is already AAC, which is true for almost every phone video and MP4, the sound is copied out exactly, bit for bit. Picking a bitrate, or OGG, re-encodes it, which is a small loss you won't usually hear at 160 kbps or more. WAV is uncompressed, so it adds no further loss but is about 10 MB per minute.
How big a video can I use?
Files of several gigabytes work, because the video is read in pieces and only the sound is kept. Very long recordings take longer when the sound has to be re-encoded; copying AAC is fast at any length.
It says the video has no sound track. Why?
Some screen recordings, GIF-style clips and exports are saved without audio. There's nothing to extract from those. If you hear sound when you play it, it may be in a separate file next to the video.