FileTranslator › MP4 to MP3
Convert MP4 to MP3
Lectures, concerts, interviews, voice memos recorded as video — often the audio is all you actually need, at a tenth of the file size.
Drop MP4 files here
or
Output is pre-set to MP3 — you can change it per file after adding.
About MP4 to MP3 conversion
The audio stream is extracted and encoded to high-quality MP3 (LAME V2) by FFmpeg running in your browser. Even large videos never leave your device — there is no upload step at all.
How to convert MP4 to MP3
- Drop your MP4 file onto the box above, or click Choose files.
- The output format is already set to MP3 — adjust it per file if you need something else.
- Click Convert, then download your MP3 file.
Free, no account, no watermarks — and because the conversion runs in your browser, your files are never uploaded to a server.
MP4 to MP3 — frequently asked questions
How do I convert MP4 to MP3?
Drop your MP4 file onto the converter above (or click Choose files), make sure the output format is set to MP3 — it is preselected on this page — then click Convert and download the result.
Is this MP4 to MP3 converter free?
Yes. Converting MP4 to MP3 on FileTranslator is completely free, with no account, no file limit and no watermarks. The site is supported by ads instead of fees.
Are my MP4 files uploaded to a server?
No. The conversion from MP4 to MP3 runs entirely in your browser using WebAssembly and JavaScript — your files never leave your device, which makes it safe for private documents and photos.