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convertexa

WebM → Opus

WebM to Opus converter

convertexa converts WebM files to Opus locally in your browser using a dedicated ffmpeg engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Re-encoded
Runs
In your browser
Max input
300 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert WebM to Opus

  1. 1 Drop your WebM file here.
  2. 2 Choose Opus as the output format and adjust the options.
  3. 3 Convert and download the result.

About WebM and Opus

WebM uses VP8/VP9 and Opus, and is natively supported by browsers.

Opus gives the best quality per bit for speech and music at low bitrates.

WebM files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • Only the first audio stream is used.

Frequently asked questions

How do I convert a WebM file to Opus?

Add your WebM file to the box above. convertexa detects the format from the file content, applies the WebM to Opus conversion and gives you the result to download. The whole operation runs inside your browser.

Are my WebM files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the WebM to Opus conversion lossless?

No. Opus is a re-encoded format, so some data is discarded to reach the target format. WebM uses VP8/VP9 and Opus, and is natively supported by browsers.

Is there a size limit?

For reliable results keep the input under 300 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.