Convert MP4 to MP3
Convert MP4 files to MP3 entirely in your browser — no upload, no account, no watermark.
Your file never leaves your device — conversion runs entirely in this browser tab.
To convert MP4 to MP3, open the MP3 converter and drop your MP4 file in. The conversion runs entirely inside your browser using WebAssembly, so the file is never uploaded. The standard audio extraction.
What to expect from this conversion
The standard audio extraction. The audio inside an MP4 is already AAC, so converting to MP3 is a second lossy pass — which is why 192kbps rather than 128kbps is the sensible floor. If you can use M4A instead, you skip the re-encode entirely.
The universal container, normally holding H.264 and AAC. Plays essentially everywhere.
Lossy · video
The format that made digital audio portable. Lossy, universally supported, and still the safest choice for compatibility.
Lossy · audio
Both MP4 and MP3 discard data to save space, so this conversion compresses something that has already been compressed. Always convert from your original file rather than from an earlier conversion — the losses compound.
How to do it
- Open the MP3 converter
Go to the MP3 converter and drop your MP4 file onto it, or click to browse.
- Convert
Press Convert. FFmpeg runs in your browser and shows real progress as it works.
- Download
Download the finished MP3 file. It is created in your browser and never sent anywhere.
Common questions
How do I convert MP4 to MP3?
Open the MP3 converter, drop your MP4 file onto it and press Convert. Everything runs in your browser — the file is not uploaded. Desktop browsers handle files up to about 200MB; mobile browsers about 40MB.
Does converting MP4 to MP3 lose quality?
Yes, some. Both MP4 and MP3 are lossy, so this is a second compression pass over data that was already compressed. The loss is usually modest, but always convert from your original rather than from a previous conversion.
Is it free to convert MP4 to MP3?
Yes, with no account, no watermark and no daily limit. The processing happens on your device rather than on a server, so there are no per-conversion costs to pass on.
Are my files uploaded when converting MP4 to MP3?
No. FFmpeg runs as WebAssembly inside your browser tab. The file is read from your disk, processed in memory and written back out — it never reaches a server.