Convert M4R to OPUS
M4R is great for custom iPhone ringtones and text tones, but OPUS is the better choice for voice messages, calls and streaming at low bitrates. Convert M4R to OPUS in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert M4R to OPUS
- 1
Tap Choose files and select one or more M4R files (or drag them in).
- 2
Check that OPUS is selected. Use Advanced options for bitrate, channels or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your OPUS downloads automatically. Converting several files? Grab them all as a ZIP.
M4R vs OPUS
Both formats are lossy, so the audio is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| M4R | OPUS | |
|---|---|---|
| Full name | iPhone Ringtone (AAC) | Opus Audio |
| Type | Audio | Audio |
| Compression | Lossy | Lossy |
| Developed by | Apple | IETF / Xiph.Org |
| Introduced | 2007 | 2012 |
| Plays on iPhone | ✓ Yes | ◐ Partly / with an app |
| Plays on Android | ✕ No | ✓ Yes |
| Plays on Windows | ◐ Partly / with an app | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About M4R and OPUS
M4R: M4R is the iPhone ringtone format. It is an AAC audio file (the same as M4A) with a different extension, and iOS only accepts ringtones up to 30–40 seconds long.
OPUS: Opus is a modern, highly efficient codec used by WhatsApp voice notes, Discord, Zoom and WebRTC calls. It sounds excellent even at very low bitrates.
Frequently asked questions
How do I convert M4R to OPUS on my phone?
Will converting M4R to OPUS reduce quality?
Is this M4R to OPUS converter free?
Are my files uploaded to a server?
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