MP4 to MP3 Converter – Free, Fast & Private
Extract the audio from MP4 videos as MP3, locally in your browser — your video never leaves your device
How to convert MP4 to MP3
Choose or drag in your MP4 file — nothing is uploaded, it stays on your device.
Conversion starts instantly — the audio is extracted and encoded to MP3 right in your browser, with live progress.
Download your MP3 file.
Everything happens right here in your browser: your file is converted locally on your device with WebAssembly FFmpeg and is never uploaded to any server. Because there is no upload, there is no practical length limit either — multi-hour recordings and files up to 8GB convert just fine, and even a huge file starts instantly. Read more: how in-browser conversion works →
About MP4 to MP3 conversion
Turn any MP4 video into an MP3 audio file: lectures you want to listen to on the go, music performances, podcasts recorded as video, or interviews you need in an audio editor.
Everything runs in your browser — the video is never uploaded. That is what makes multi-gigabyte recordings practical: a 4GB lecture starts converting the moment you drop it in, and only the audio track is processed, so it finishes in a fraction of the video's length.
Frequently asked questions
Drop your MP4 into the box above and click Start — the audio track is extracted and encoded to MP3 right in your browser, with a progress bar. Download the MP3 when it finishes. Free, no signup, no watermark.
Yes — that is the main use case. Files up to 8GB on desktop (2GB on mobile) are supported, and since only the audio stream is decoded, a 2-hour recording typically converts in a few minutes even on a laptop.
No. The video track is discarded entirely; only the audio stream is decoded and re-encoded. A blurry 240p recording and a 4K one produce the same MP3 if the sound is the same.
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your recording never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing. For personal recordings, lectures and meetings this matters more than anywhere else.
Up to 8GB on desktop browsers and 2GB on mobile — big enough to pull the audio out of a multi-hour lecture or meeting recording. There is no limit on the number of files, no signup and no watermark.
192kbps, which is transparent for speech and very close to transparent for music. The audio stream is decoded once and encoded once — there is no extra generation loss from server-side re-processing.
Yes — completely free and unlimited, with no watermark, signup or daily quota. Because the conversion runs on your own device instead of our servers, there are no processing costs to charge for.
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on Windows, macOS, ChromeOS, Linux, iOS and Android. There is nothing to install.
Audio-only work is fast: there is no video to re-encode, so even the soundtrack of a long video converts in well under real time. Files whose audio is already MP3 are rewrapped without re-encoding and finish in seconds.