Convert WEBM to OPUS online
Free, no sign-up, no limits. Drop your WEBM files, get OPUS files back in seconds.
1 files converted so far
Drop your WEBM files here
or · multiple files accepted
Local conversion: your files never leave your device.
Why convert WEBM to OPUS?
An online recorder, a screen capture or a YouTube download gave you a WebM file that your usual player rejects. OPUS is recognized everywhere.
How to do it, step by step
- Drop your WEBM fileinto the area at the top of the page (or several files at once). On mobile, tap the area and pick the file from your apps.
- Check the output format: OPUS is already selected. For music, 192 kbps is transparent for most listeners and 320 kbps gives the maximum. For voice (memos, podcasts, lectures), 128 kbps is more than enough and halves the file size.
- Start the conversion.The FFmpeg engine loads once (≈ 10 MB), then each file is processed in a few seconds without leaving your device.
- Download your OPUS, directly or as a .zip if you converted several files. The name and metadata (title, artist, cover art) are preserved.
The WEBM format (WebM (audio))
WebM is an open web container, used by YouTube, screen recorders and the voice recorders built into browsers. Its audio is Opus or Vorbis. Many desktop applications and devices cannot play it.
- Open web format
- Produced by online recorders
- Rarely played outside a browser
- Zero compatibility with car stereos
The OPUS format (Opus Interactive Audio Codec)
Opus is currently the most efficient audio codec: it delivers the best possible quality at very low bitrates. It is the format of WhatsApp, Telegram and Discord voice messages and of video calls. Excellent, but still poorly recognized by consumer players and car stereos.
- Exceptional quality at low bitrates
- Free format
- The standard for voice on the internet
- Very few devices play it
- Often impossible to open on Windows without extra software
WEBM vs OPUS comparison
| WEBM | OPUS | |
|---|---|---|
| Compression | Lossy | Lossy |
| Typical size (1 min, music) | ≈ 0.8 MB | ≈ 0.7 MB |
| Common use | browser recordings, screen captures, downloaded YouTube videos | WhatsApp/Telegram voice messages, Discord, calls |
| Metadata (title, cover art) | Limited | Yes |
Frequently asked questions
Does converting WEBM to OPUS lose quality?
OPUS is a lossy compressed format: a conversion always involves re-encoding. At 192 kbps or higher, the difference is inaudible in the vast majority of cases. Just avoid chaining several successive conversions.
Is the WEBM to OPUS converter free?
Yes, with no limit on the number of files, no sign-up and no watermark. Each file can be up to 200 MB.
Are my WEBM files uploaded to the internet?
No. The WEBM to OPUS conversion is performed by FFmpeg directly in your browser (WebAssembly). Your files never leave your computer or phone.
How do I convert WEBM to OPUS on iPhone or Android?
Open this page in Safari or Chrome, tap the drop area, select your WEBM file (from Files, Voice Memos, Downloads or WhatsApp), then tap "Convert". The OPUS downloads to your files.
Can I convert several WEBM files at once?
Yes, add all your files in one go. They are converted one after another and a button lets you download everything as a .zip archive.