Video & audioFree, no sign-up
MP4 to MP3: extract the audio from any video for free
Go from MP4 to MP3 in seconds: pick the format and quality, see the file size instantly and download the audio. Your video is never uploaded, so there’s no size limit.
or click to choose it. MP4, MOV, WebM or MKV. An M4A audio file works too.
Estimated size
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Pick a video and you’ll instantly see how big the audio will be.
Your video never leaves your device: the audio is extracted right here, in your browser. No uploads, no sign-up, no size limit.
Just one part (optional)
How it works: your browser reads the video, separates the audio track and saves it in the format you pick (the MP3 is made with the open-source LAME encoder). Nothing goes to any server. The estimated size is bitrate times duration.
You don’t need to upload your video to a sketchy site or install software to go from MP4 to MP3. This MP4 to MP3 converter separates the sound from the picture inside your browser and hands it back as MP3, lossless M4A or WAV. Use it to extract audio from video shot on your phone, a Zoom recording or a livestream.
How to convert MP4 to MP3 in 4 steps
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Drop in your video
MP4, MOV, WebM or MKV. You’ll see the audio it carries: format, sample rate and whether it’s stereo.
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Pick the format
MP3 to play anywhere, M4A to copy the original audio with no loss, WAV if you’re going to edit it.
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Set quality or a range
For MP3, 192 kbps is the sweet spot. Only need a piece? Open “Just one part” and type the start and end.
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Extract and download
Press “Extract audio”, listen in the player and download.
That’s how to convert MP4 to MP3 without installing anything. It’s also the answer to how to extract audio from iphone video clips: open this page in Safari, pick the video from Photos and turn MP4 to MP3 right on your phone.
MP3, M4A or WAV: which format to pick when you extract audio
Audio size is simple math: size (MB) = kbps × seconds ÷ 8,000. So one minute takes up:
| Format | Quality | Size per minute | Best for |
|---|---|---|---|
| MP3 | 128 kbps | 0.96 MB | Voice, podcasts, notes |
| MP3 | 192 kbps | 1.44 MB | Almost everything |
| MP3 | 320 kbps | 2.4 MB | Music |
| M4A | Same as the original | Same as the video’s audio | Keeping the exact sound |
| WAV | 48 kHz, stereo | 11.5 MB | Editing in Audacity, Premiere or DaVinci |
For MP3, the audio is decoded and re-encoded with LAME, the classic open-source MP3 encoder, through the Mediabunny library. M4A re-encodes nothing: it copies the video’s AAC track, which is why it takes under a second.
MP4 to WAV: how to convert it, what it weighs and where it stops
Going from MP4 to WAV has one job: editing audio without compressing it again. WAV doesn’t improve the sound. If the video carried AAC, the WAV is that same quality, just uncompressed.
The tool writes 48 kHz, stereo, 16-bit audio, which is 192,000 bytes per second, or about 11.5 MB a minute. In our test, a 5-second range came to 960 KB. Here is the full math:
| Length | WAV size | MP3 at 192 kbps |
|---|---|---|
| 10 minutes | 115 MB | 14.4 MB |
| 1 hour | 691 MB | 86 MB |
Classic WAV files top out at 4 GB because of a 32-bit header, about 6 hours with these settings. Use WAV to mix in Audacity, Premiere or DaVinci. To publish a podcast or email a file, MP3 is eight times lighter.
Video to MP3 for podcasts, reels and transcripts
How to extract audio from video in ways that save marketers real time:
- A podcast from a video. Record the interview on camera and publish the audio too. One recording, two channels.
- Transcripts and captions. Uploading a 20 MB MP3 to a transcription service is far faster than uploading the 500 MB video.
- Ad voiceovers. Extract audio from a spot to reuse the voice in another cut or send it for review.
- Listening to a webinar. No screen needed, in the car or on a walk.
One note: only extract audio from videos you own or have the rights to use.
Separate audio from video: keep the sound, the picture or both
People who want to separate audio from video usually mean one of three things, and none of them needs an upload.
- Only the sound. That is what this page does: pick MP3, M4A or WAV and download the audio.
- Only the picture. Run the video through the video compressor and tick “Remove audio” to get a silent MP4.
- Both pieces. Do both with the same file and you end up with a silent video and a separate audio file. The original stays untouched.
It is handy for a background video on your site with the voiceover kept apart, or for sending only the voice to a client for review. Only separate audio from videos you own or have the right to use.
Frequently asked questions about converting MP4 to MP3
Is it safe to use an online MP4 to MP3 converter?
It depends on where your file goes. Most online converters upload your video to their server, and some surround the download button with misleading ads. This one never uploads anything: your browser reads the file and builds the MP3 locally, so nothing leaves your device. Whatever tool you use, never install extensions or executables a converter site pushes on you.
How do I save an MP3 from an MP4?
Drop the MP4 here, keep MP3 at 192 kbps and press “Extract audio”. A few seconds later you can play it in the page and hit download. Only need part of it? Open “Just one part” and type the start and end times first, so you skip trimming the audio afterwards.
How do I extract audio from an iPhone video?
Open this page in Safari on your iPhone, tap the drop area and choose the video from Photos. Pick MP3, or M4A to keep the original audio untouched, then tap “Extract audio” and download. Safari saves the file to the Files app, under Downloads. The video stays on your phone the whole time.
How do you extract audio from a video?
An MP4 video holds two separate tracks: one for picture and one for sound. Extracting the audio means keeping only the second. Save it as M4A and it’s copied as is, with zero quality loss and almost instantly. Choose MP3 or WAV and the audio is decoded and saved in the new format. All of it runs in your browser.
How do I convert MP4 to MP3 without losing quality?
Strictly, you can’t: the audio inside an MP4 is usually AAC, already compressed, and MP3 compresses it again. At 192 kbps the difference is very hard to hear, and at 320 kbps it’s practically inaudible. If you need the exact original sound, pick M4A instead, which copies the audio track without touching it.