Convert WebM to Opus Online Free
Extract the audio from your WebM video and save it as an Opus audio file — the modern open codec ideal for streaming, Discord bots, and real-time web applications.
ChangeThisFile extracts audio from your WebM video and encodes it as Opus using FFmpeg on our secure servers. Opus is the cutting-edge open codec used in WebRTC, Discord, and web streaming. Files are auto-deleted after conversion, completely free with no signup needed.
Convert WebM to Opus
Drop your WebM file here to convert it instantly
Drag & drop your .webm file here, or click to browse
Convert to Opus instantly
WebM vs Opus: Format Comparison
Key differences between the two formats
| Feature | WebM | Opus |
|---|---|---|
| Type | Open web video container | Open audio codec in OGG container |
| Audio codec | Vorbis or Opus | Opus — IETF RFC 6716 |
| Video included | Yes (VP8 or VP9) | No — audio only |
| File size | Moderate to large | Very small — ultra-efficient compression |
| Latency | Normal streaming latency | Ultra-low latency (5ms algorithmic) |
| Use case | HTML5 video streaming | WebRTC, Discord, VoIP, low-bandwidth streaming |
| License | Open-source, royalty-free | Open-source, royalty-free |
| Browser support | Chrome, Firefox, Edge video | Chrome, Firefox, Edge, Safari audio |
When to Convert
Common scenarios where this conversion is useful
Extract WebM audio for Discord bot streaming
Discord voice channels use Opus internally. Converting WebM video audio to Opus files lets Discord bots stream audio with minimal processing overhead, using libraries like discord.js or discord.py with native Opus support.
Create compact audio from browser screen recordings
Browser MediaRecorder often produces WebM with Opus audio. Extracting to a standalone Opus file removes the video overhead, giving you a tiny audio file perfect for archiving or sharing recordings.
Optimize audio for low-bandwidth web streaming
Opus delivers excellent audio quality at bitrates as low as 32–64 kbps — far better than alternatives at those sizes. Extract WebM audio to Opus when building streaming apps that must work on slow connections.
Prepare audio for WebRTC applications
WebRTC natively uses Opus for audio. Converting pre-recorded WebM content to Opus lets you inject it into WebRTC pipelines without any codec conversion overhead during playback.
Remove video overhead from WebM for audio-only podcasts
If you record podcasts as video via browser tools (Zoom web, Google Meet, etc.) in WebM format, extract the audio to Opus for a compact open-format audio file before editing and exporting to MP3 or AAC.
How to Convert WebM to Opus
-
1
Upload your WebM file
Drag and drop your .webm file onto the converter or click to browse. Files up to 500MB are supported.
-
2
Server-side Opus extraction
Your file is uploaded over HTTPS and FFmpeg processes the WebM. If the WebM already contains Opus audio, FFmpeg can stream-copy it directly into an OGG/Opus container with no re-encoding. Otherwise it re-encodes to Opus.
-
3
Download your Opus file
Click Download to save the .opus file. Both the original WebM and output Opus are automatically deleted from our servers after download.
Frequently Asked Questions
Yes, in many cases. Modern WebM files — especially those recorded via browser MediaRecorder or from YouTube — often contain Opus audio. In this case, FFmpeg can copy the audio directly to an OGG/Opus container with zero quality loss.
At low to medium bitrates, Opus significantly outperforms Vorbis. At high bitrates they are comparable. Opus also has much lower latency, making it better for real-time and streaming applications. For archiving music, Vorbis may still be preferred.
Opus audio is stored in an OGG container. The file uses a .opus or .ogg extension. The .opus extension is the modern standard for Opus-in-OGG files.
Yes. Opus supports up to 255 channels including 5.1 and 7.1 surround configurations. Multi-channel audio from the WebM source will be preserved in the Opus output.
Godot uses OGG Vorbis (not Opus) for streaming audio by default in current stable versions. Unity supports OGG which may include Opus. Check your specific engine version for Opus support status.
If the WebM contains Opus audio and FFmpeg stream-copies it, there is zero quality loss. If re-encoding is needed, the quality loss is minimal at default high-quality settings.
Chrome, Firefox, Edge, Android (5+), VLC, mpv, and most modern open-source players support Opus. Windows Media Player and some older devices do not support Opus natively.
Yes. ChangeThisFile is completely free. No signup, no watermarks, and no limits on conversions.
Very fast. When stream-copying Opus audio from WebM (no re-encoding), the conversion is nearly instantaneous regardless of file length. Re-encoding is also fast since Opus is a computationally efficient codec.
Yes. All uploads are encrypted via HTTPS. Files are deleted automatically from our servers right after you download the converted file. We never store or access your content.
Related Conversions
Ready to convert your file?
Convert WebM to Opus instantly — free, no signup required.
Start Converting