Convert MP4 to OPUS
Extract the audio from MP4 videos and save it as OPUS — ideal for voice messages, calls and streaming at low bitrates.
- 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 MP4 to OPUS
- 1
Tap Choose files and select one or more MP4 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.
MP4 vs OPUS
Only the sound is kept — the picture is dropped, so the OPUS file is far smaller than the MP4 video.
| MP4 | OPUS | |
|---|---|---|
| Full name | MPEG-4 Part 14 | Opus Audio |
| Type | Video | Audio |
| Compression | Lossy | Lossy |
| Developed by | MPEG | IETF / Xiph.Org |
| Introduced | 2001 | 2012 |
| Plays on iPhone | ✓ Yes | ◐ Partly / with an app |
| Plays on Android | ✓ Yes | ✓ Yes |
| Plays on Windows | ✓ Yes | ✓ Yes |
| Plays on Mac | ✓ Yes | ✓ Yes |
About MP4 and OPUS
MP4: MP4 is the universal video format. With H.264 video and AAC audio it plays on every iPhone, Android phone, smart TV, browser, WhatsApp, Instagram and YouTube.
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 MP4 to OPUS on my phone?
Will converting MP4 to OPUS reduce quality?
Can I convert only part of the MP4?
Is this MP4 to OPUS converter free?
Are my files uploaded to a server?
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