MP4 to MP3 Converter

Convert MP4 videos to MP3 instantly and privately. Everything happens on your own device — nothing is uploaded to a server.

Drop your MP4 file here

Accepted: .mp4 · Max 300MB

Choose File

Files stay on your device — nothing is uploaded.

The audio engine downloads once (about 30MB) the first time you convert, then stays cached in your browser for future conversions.

What is MP4 to MP3 conversion?

MP4 to MP3 conversion extracts the audio track from an MP4 video and re-encodes it as a standalone MP3 file. MP4 is the most widely supported video container format, typically pairing H.264 video with AAC audio. It's the default format for video recorded on phones and shared online. MP3 is a lossy audio format that compresses sound by removing frequencies the human ear barely notices. It remains the most universally compatible audio format for music and voice.

How to convert MP4 to MP3

Choose an MP4 file using the drop zone above (or drag and drop it in).
Wait a moment while your browser converts the file locally.
Click "Download" to save your new MP3 file.

Why convert MP4 to MP3?

Extracting the audio from a video is useful when you only need the sound — a lecture, a podcast recording, a music clip, or a voice memo — without carrying around the much larger video file.

Is this conversion private?

Yes. This MP4 to MP3 converter runs entirely in your browser using a WebAssembly build of FFmpeg — your file is never uploaded to our servers, stored, or logged. Closing this tab discards everything.

Supported browsers

This converter works in all modern browsers, including Chrome, Firefox, Safari, and Edge, on both desktop and mobile (Android and iOS).

Frequently Asked Questions

How do I convert MP4 to MP3?: Choose an MP4 file using the drop zone or "Choose File" button above. The converter runs in your browser using a WebAssembly build of FFmpeg and gives you a "Download" button for the resulting MP3 file — no upload, no waiting on a server.
Is this MP4 to MP3 converter free?: Yes. The converter is completely free with no sign-up, no watermark, and no limit on how many files you convert.
Are my files uploaded to a server?: No. This conversion happens entirely inside your browser using a WebAssembly build of FFmpeg. Your file is never uploaded, stored, or transmitted anywhere.
Does converting MP4 to MP3 reduce quality?: Extracting audio from video re-encodes the audio track. MP3 uses a high-quality variable bitrate setting by default, which sounds close to indistinguishable from the source for most listening.
Can I use this converter on my phone?: Yes, but audio/video conversion is CPU-intensive. It will work on modern phones, though larger files may take noticeably longer than on desktop.
What is the maximum file size I can convert?: Because conversion happens on your own device, the limit depends on your browser and device memory. We recommend keeping individual files under 300MB for the smoothest experience.

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What is MP4 to MP3 conversion?

Frequently Asked Questions

How do I convert MP4 to MP3?

Choose an MP4 file using the drop zone or "Choose File" button above. The converter runs in your browser using a WebAssembly build of FFmpeg and gives you a "Download" button for the resulting MP3 file — no upload, no waiting on a server.

Is this MP4 to MP3 converter free?

Yes. The converter is completely free with no sign-up, no watermark, and no limit on how many files you convert.

Are my files uploaded to a server?

No. This conversion happens entirely inside your browser using a WebAssembly build of FFmpeg. Your file is never uploaded, stored, or transmitted anywhere.

Does converting MP4 to MP3 reduce quality?

Extracting audio from video re-encodes the audio track. MP3 uses a high-quality variable bitrate setting by default, which sounds close to indistinguishable from the source for most listening.

Can I use this converter on my phone?

Yes, but audio/video conversion is CPU-intensive. It will work on modern phones, though larger files may take noticeably longer than on desktop.

What is the maximum file size I can convert?

Because conversion happens on your own device, the limit depends on your browser and device memory. We recommend keeping individual files under 300MB for the smoothest experience.