Apple caps custom ringtones at 40 seconds and most ring cycles are under 30. Past 40 seconds, most phones fade the tone anyway.

MP3 or M4R for iPhone?

Both work. iTunes and Apple Music accept either — M4R is just an AAC container. Renaming .mp3 → .m4r works on most recent iOS versions.

Does the file stay in my browser?

Yes. Trimming, fading, and encoding all happen via Web Audio API and OfflineAudioContext. Nothing uploads.

Pick a 15–40 second section of any song, add a fade-out, and export as MP3. Ready to transfer to your phone.

Drop a song to turn into a ringtone

or click to browse

Your audio never leaves your browser. Trimming and fading run locally via the Web Audio API.