Files never leave your device. Any size, any length.
MP3 to MP3.
No size, no length limits.
Re-encode to a smaller bitrate, fix tags, or make a mono copy for speech.
Files never leave your device. Any size, any length.
Re-encode to a smaller bitrate, fix tags, or make a mono copy for speech.
On your device
MP3 audio files (MPEG audio) usually carry MP3 audio and come from everywhere. Re-encode to a smaller bitrate, fix tags, or make a mono copy for speech.
Is my MP3 file uploaded?
No. MP3 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.