WEBM → OPUS
Convert WEBM 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
Your first conversion lands here automatically — saved on this device only, never uploaded.
100% Private
Runs in your browser. No upload.
Instant
No queue, no server roundtrip.
Offline-ready
Works after first load.
Re-wrapping WEBM footage as OPUS is what makes it playable and editable outside the device or era it came from, without re-shooting anything. OPUS (Opus audio codec) earns its place here: outstanding clarity at tiny bitrates, especially for speech. WebM is the open, royalty-free web video container built around VP8, VP9 and AV1. It was designed specifically to stream inside HTML5 video without plugins or licences.
WebM is the open, royalty-free web video container built around VP8, VP9 and AV1. It was designed specifically to stream inside HTML5 video without plugins or licences.
Picture and sound are re-encoded into the OPUS container at a bitrate chosen to keep the result visually close to the WEBM source. Resolution, frame rate and duration are preserved; file size usually changes noticeably because WEBM and OPUS lean on different codecs. Multiple audio tracks or chapter data may not carry over.
What you gain with OPUS: Outstanding clarity at tiny bitrates, especially for speech.
Drop your WEBM file above and Morphio 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. See exactly how in-browser conversion works.
Open the WEBM to OPUS page, drop your video on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the WEBM data never leaves your device and no server ever receives a copy.
Audio and video tracks are re-encoded together, so the result stays in sync and plays on standard players. Converting WEBM to OPUS only rewrites the container and encoding you asked for — the source file on your disk is never modified.
Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.
Morphio decodes the WEBM file at full fidelity and re-encodes it at a high-quality OPUS setting, so the difference is normally invisible or inaudible. What conversion cannot do is recover detail the original WEBM file already threw away.
Yes — drop the whole batch in and each file is processed in turn on your own machine. The practical limit is your device's memory and patience, not a server quota, because nothing is queued anywhere else.
No. The conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can disconnect from the internet after the page loads and it still works.