Convert MP4 to MP3 Free

Convert MP4 to MP3 free — no watermark on the audio, no account to create, and no paywall waiting at the download button. Drop the video, get the sound.

MP4MP3

Drop your MP4 file here or click to browse

MP4 (.mp4) · Max 20 MB

Search 'free MP4 to MP3 converter' and most results are free right up until the download: an account appears, a watermark tone gets mixed into the audio, or your file joins a queue behind paying users. AudioUtils' free tier does none of that. The engine is the same FFmpeg build Pro uses, the bitrate options are the same, and the MP3 comes out clean. The limits are stated plainly — input files up to 20 MB, five conversions a month, and a 10-second output preview — and Pro simply removes them.

The other thing usually being paid for is your file. Server-based converters are free because your upload is the product: your video is copied to their infrastructure and kept under terms nobody reads. Here the conversion runs inside your browser with WebAssembly, so the MP4 never leaves your machine — worth knowing before you hand over a recording of your own meeting, lecture, or family video.

An MP4 holds a video track and an audio track, and the video is almost all of the file size. Extracting the audio is why the numbers look so dramatic: a 500 MB video typically yields an MP3 of 5-15 MB. Nothing is added and nothing is padded — you simply keep the part you wanted.

For bitrate, match the source: 128-192 kbps is plenty for talking-head video, lectures, and webinars, while 256-320 kbps is the right choice for music, concerts, and anything you'll actually listen to for enjoyment. The audio inside an MP4 is normally AAC, so re-encoding to MP3 at a generous bitrate keeps the difference inaudible.

No installer, no signup, no trial clock. Open the page, drop the file, download the MP3, close the tab. If you need full-length output or larger files, Pro is $9/month — and the privacy behaviour is identical on both tiers, because there was never a server in the loop to begin with.

Frequently Asked Questions

Is this MP4 to MP3 converter actually free?

Yes — no watermark, no signup, no queue. Free covers input files up to 20 MB, five conversions a month, and a 10-second output preview. Pro ($9/mo) removes those caps. The conversion engine and audio quality are identical on both.

Do free MP4 to MP3 converters add a watermark to the audio?

Many do — a spoken tag or tone mixed into the output. This one doesn't. The MP3 you download contains only the audio that was in your video.

Do I have to upload my video to convert it?

No. The extraction runs locally in your browser via WebAssembly, so the MP4 never leaves your device. That's unusual for a free online converter and it's the main reason this one is safe for private recordings.

How big will the MP3 be compared to the MP4?

Far smaller — the video track is almost the entire file. A 500 MB MP4 typically produces a 5-15 MB MP3, because you're keeping only the audio.

What bitrate should I pick?

128-192 kbps for lectures, webinars, and talking-head video; 256-320 kbps for music and concerts. MP4 audio is usually AAC, so a generous bitrate keeps the re-encode inaudible.