Is this MP4 to MP3 converter free?

Yes. It’s free, with no account and no limit on the number of files.

Are my videos uploaded anywhere?

No. The conversion runs in your browser on your own device; your MP4 files and the MP3s stay with you.

Does it work on an iPhone or Android phone?

Yes. Open the converter in your phone’s browser and choose the video. On an iPhone, pick it from the Files app to use the original file. Very long videos convert faster on a computer.

Which bitrate should I pick?

128 kbps for speech, 192 kbps for most music, 256 or 320 kbps for music you care about. The converter suggests one from your video’s own sound.

How big will the MP3 be?

About 1 MB per minute at 128 kbps and 2.4 MB per minute at 320 kbps. The converter shows the size for your file before you convert.

Can I just rename .mp4 to .mp3?

No. The name changes but the file is still a video, and many players won’t open it. Converting decodes the sound and writes a real MP3.

Are the title and cover kept?

Yes. When the MP4 has a title, artist, album or cover picture, they are written into the MP3.

Can I convert an MP3 back into an MP4 video?

No. An MP3 holds only sound, so the picture is gone. Keep the original MP4 if you may need the video again.

Is converting MP4 to MP3 legal?

Converting videos you recorded or have the rights to is fine. Copying other people’s work is governed by copyright law: in the US, the owner holds the right to make copies (17 U.S.C. § 106) and fair use (§ 107) is decided case by case. This converter works only on files on your device and downloads nothing from other sites.

Free MP4 to MP3 Converter in Your Browser

no sign-up, no file limit: Free
your videos stay on your device: In your browser
MP3, or WAV for editing: 128 to 320 kbps
10-minute video to MP3 on a desktop: 7 s
drop a whole folder of clips: Several at once
no added silence at either end: Exact length

How do you convert MP4 to MP3?

To convert MP4 to MP3, open the converter, drop in your MP4 files and pick a bitrate: 128 kbps for speech, 192 kbps for most music, 320 kbps for the best quality. The converter reads the video’s sound track, encodes it as MP3 in your browser and gives you a file to play or download. Nothing is installed and your video stays on your device.

Convert MP4 to MP3 in three steps

Free, with no account, on a phone or a computer.

Add your MP4 files
Open the converter and drop in one video or many. Each file shows its sound track: codec, sample rate, channels and length.
Choose the MP3 quality
Pick 128, 192, 256 or 320 kbps; the list shows how big each file will be. Choose WAV instead if the audio is going into an editor.
Download the MP3
Convert, play the result, and download it under the video’s own name. Then send it on to the transcriber or the vocal remover if you need to.

Why use this converter

Free, and it shows you what you get before you download it.

Converted in your browser, your videos stay with you

The conversion happens on your own phone or computer. Long recordings, interviews and family videos never have to leave your device, and there is no upload to wait for, so a large file starts at once.

See the size before you choose

Each bitrate shows the MP3 size for your file. Speech sounds the same at 128 kbps as at 320, so a lecture can be a quarter of the size; for music, 256 or 320 kbps keeps the detail.

Long videos in seconds

The converter reads the video piece by piece instead of loading it whole, so length isn’t a problem. On a desktop, a 10-minute video becomes an MP3 in about 7 seconds.

Exactly as long as the video

MP3 encoders add a little silence at the start and the end. This converter writes the information players use to remove it, so your MP3 starts on the first word and lines up with the video.

Title and cover come along

When the video carries a title, artist, album or cover picture, they go into the MP3 as tags that Windows, car stereos and music apps can read.

From the MP3 to the next step

A recorded talk often needs a transcript, and a music video an instrumental. The finished MP3 goes straight to the transcriber or the vocal remover, with no download and re-upload in between.

MP4 to MP3 samples

Every sample is a video made from this site’s own recordings, converted by this converter. Compare the spectrum and the size before and after.

Your videos stay yours

What happens to your files, point by point.

Converted on your device
The MP4 is read and the MP3 is written by your own browser, on a phone or a computer.
Your files stay on your device
Videos and MP3s stay where you keep them; the converter needs no copy of them.
No account needed
Convert as many files as you like without signing up or giving an email address.
Saved under your file’s name
Each MP3 keeps the video’s name, so a folder of clips converts into a folder you can find your way around.

MP4 to MP3 guide: bitrates, devices and other ways

What converting MP4 to MP3 does

An MP4 file holds a video track, usually H.264, HEVC or AV1, one or more sound tracks, usually AAC, and details such as the title. Converting keeps only the sound: the converter decodes the AAC track and encodes it again as MP3, which plays on every phone, car stereo and old MP3 player.

The picture is never decoded, so the video format doesn’t matter. An MP4 that your computer can’t play, from a new phone or a screen recorder, still converts as long as its sound is AAC, MP3 or Opus.

Which MP3 bitrate to choose

The bitrate decides the size and how much detail is kept. Talks, lessons, meetings and podcasts sound the same at 128 kbps as at higher rates. Most music is fine at 192 kbps; choose 256 or 320 kbps for music you care about or plan to play on good speakers.

An MP3 can’t hold more than the video had. A phone video with sound at 128 kbps gains only size at 320, so the converter suggests a bitrate from the source and points out when a higher one would only make the file bigger.

1Speech: 128 kbps, about 1 MB a minute.
2Music in general: 192 kbps, about 1.4 MB a minute.
3Music you care about: 256 or 320 kbps, about 2 to 2.4 MB a minute.
4For editing: WAV, about 10 MB a minute, no quality lost again.

MP4 to MP3 on Windows, Mac, iPhone and Android

Windows has no built-in MP4 to MP3 option. On a Mac, the built-in video player’s File, Export As, Audio Only saves an M4A, not an MP3, so you still need to convert it. Phones offer neither.

This converter works the same everywhere: open the page in Chrome, Edge, Firefox or Safari, on a computer or a phone, and convert without installing an app. On an iPhone, choose the video from the Files app to give the converter the original file.

Other ways: a media player and the command line

If you already have a free media player with a convert menu, it can turn MP4 into MP3: add the file, choose an MP3 audio profile, set a destination and start. It works one file at a time and shows no size before you begin.

On the command line, one line does the same: ffmpeg -i input.mp4 -vn -c:a libmp3lame -b:a 192k output.mp3. Here -vn drops the video and -b:a sets the bitrate.

When an MP4 won’t convert

A few files need a different route. The converter tells you which case it is, and what to try next.

1No sound track: some screen recordings and exported clips carry only pictures.
2Copy protection: films bought from iTunes and other stores are locked to their app.
3Not really MP4: AVI, WMV and FLV files need saving as MP4 first, for example with a free media player.
4Very long files on an older phone or browser: use the latest Chrome, Edge, Firefox or Safari, or a computer.

Recording something new? Most phone and screen recorders can save sound only. When you only need the audio, a sound-only recording keeps files small from the start.