MP4 → OPUS
Convert MP4 video to OPUS entirely in your browser — no upload, no watermark, no sign-up.
Drop files here
or browse from your device
images · audio · video · documents · archives · up to ~500MB
100% Private
Runs in your browser. No upload.
Instant
No queue, no server roundtrip.
Offline-ready
Works after first load.
MP4 is the safest video container, which also means it is the one everybody already has and nobody optimises. Opus is the best-in-class codec for speech and low-bitrate audio, holding up where MP3 falls apart, so converting turns a file you are stuck with into one you can actually use. Morphix does the whole MP4 → OPUS conversion locally with WebAssembly, so even sensitive material never leaves your device.
Drop your MP4 file above and Morphix decodes it locally, then re-encodes it as OPUS using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle.
Keep your files & browsing private — get NordVPN