Files never leave your device. Any size, any length.
MP4 to MP3.
No size, no length limits.
Keep the talk, interview or music and drop the video — an MP3 is a fraction of the size and plays everywhere.
Files never leave your device. Any size, any length.
Keep the talk, interview or music and drop the video — an MP3 is a fraction of the size and plays everywhere.
On your device
MP4 video files (MPEG-4 (ISOBMFF)) usually carry AAC, MP3, Opus audio and come from phones, screen recordings, downloads, video editors. Keep the talk, interview or music and drop the video — an MP3 is a fraction of the size and plays everywhere.
Is my MP4 file uploaded?
No. MP4 files convert inside your browser; nothing leaves your device.
Is there a file size or duration limit?
No. mp3fy streams the file while converting, so a 20 GB recording or a 10‑hour lecture works the same as a short clip.
What bitrate should I pick?
192 kbps is the sweet spot for music and speech; 128 kbps for voice notes and podcasts; 320 kbps if you want the maximum. You can also keep stereo or down‑mix to mono.
Are my tags and cover art kept?
Yes — title, artist, album and embedded cover art are carried over into the MP3 when the source has them.