MP4 to OPUS
Extract the soundtrack from MP4 video as OPUS audio. Everything runs on your device, so even large files never leave it.
From
MP4 (.mp4)
To
OPUS (.opus)
Advanced options
- Only the soundtrack is kept — the video track is discarded, which makes this much faster than a full conversion.
- Conversion uses the audio and video codecs built into your browser, so results depend on your device. Unsupported targets are greyed out.
Drop MP4 files here, or use the button below
Converted on your device — your files are never uploaded.
About these formats
- MP4 — MPEG-4 video
- The default video format — plays everywhere, from phones to TVs.
- OPUS — Opus audio
- The most efficient modern codec — excellent quality at low bitrates.
- Only the soundtrack is kept — the video track is discarded, which makes this much faster than a full conversion.
- Conversion uses the audio and video codecs built into your browser, so results depend on your device. Unsupported targets are greyed out.
Other MP4 conversions
Private by design — no upload, no sign-up
This MP4 to OPUS converter runs locally, using your own browser. Your files are never uploaded to a server, so they stay on your device from start to finish.
- Are my MP4 files uploaded to a server?
- No. The MP4 to OPUS conversion runs locally in your browser using your own device's CPU. Your files are never uploaded, never transmitted over the network and never stored on a server.
- Is there a file size limit for MP4 to OPUS?
- There is no imposed limit, because nothing is uploaded. The practical ceiling is your device's available memory, so very large files may be slower on older hardware.
- Does it work offline?
- Yes. Once the page has loaded, converting MP4 to OPUS keeps working without a network connection, since the conversion happens entirely on your device.
- Do I need to sign up or install anything?
- No. There is no sign-up, no account and no software to install. Pick a MP4 file and convert it to OPUS straight away.
- Is converting MP4 to OPUS free?
- Yes, it is free to use, with no watermarks and no daily quota.