M4R is an AAC ringtone capped near 40 seconds. Trim your MP3 clip first, then convert — the result imports straight into iPhone as a custom ringtone.
About MP3
The most popular lossy format
MP3 is a lossy audio format that greatly reduces file size while keeping near-CD perceived quality. It is supported by virtually every device and player, making it the top choice for sharing.
- Small file size, easy to share
- Universally supported by devices
- Lossy compression cannot restore lost audio
About M4R
iPhone ringtone format
M4R is the ringtone format used by iPhone, essentially AAC audio limited to around 40 seconds, suited for creating custom ringtones.
- Usable directly as an iPhone ringtone
- Length-limited and single-purpose
MP3 to M4R FAQ
Will converting MP3 to M4R lose quality?
Both MP3 and M4R are lossy formats. Re-compression may further reduce quality — choose a higher bitrate to minimize additional loss.
Will the file size change after conversion?
Converting to a lossless format (WAV) usually increases size, while converting to a lossy format (MP3, AAC) usually decreases it, depending on the chosen bitrate and sample rate.
How do I batch convert MP3 to M4R?
Just drop multiple MP3 files in; they are converted to M4R one by one via a queue. You can download them individually or as a single ZIP.