MP4 to MP3
Extract the audio from an MP4 video and convert it to MP3 format.
How to Extract Audio from MP4 to MP3 Online and Free
Upload your MP4 video file
Drag and drop your MP4 video, or click to select it from your computer or mobile device.
Wait for the audio to be extracted
The first time, your browser downloads the conversion engine; then the audio is extracted and converted directly on your device, without uploading anything to a server.
Download your MP3 file
Click the conversion button and download the resulting MP3 file, containing only the audio from the original video.
Why extract audio from an MP4 on PDFDocks?
Sometimes you only need the sound from a video — an interview, a lecture, music — without carrying the weight of the entire video file. PDFDocks extracts and converts the audio directly in your browser, without uploading your video to any server.
Is it safe to extract audio from an MP4 online with PDFDocks?
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Yes. Your video is never uploaded to a server: extraction and conversion happen directly in your browser.
Which browsers are compatible with this tool?
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You need a modern browser with WebCodecs support, such as a recent version of Chrome, Edge, or Opera. Some older or less common browsers may not be compatible.
Is quality lost when extracting audio?
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The audio is decoded and re-encoded to MP3 at 192 kbps, a high and standard quality — the difference from the original audio is usually imperceptible to most people.
Does it work with any MP4 video?
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It works with the vast majority of MP4 files, which typically carry audio in AAC format. If your video uses an uncommon audio format, the tool may not be able to process it.
Do I need to install any program?
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No, there's no need to install anything. It works directly from your browser, although it needs to download the conversion engine the first time you use it.
Is there a file size limit?
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We haven't set any artificial limits. The only real limit is your device's memory and processing power — very long videos may take longer to process.
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